1News for the tz database 2 3Unreleased, experimental changes 4 5 Changes to build procedure 6 7 Files in distributed tarballs now have correct commit times. 8 Formerly, the committer's time zone was incorrectly ignored. 9 10 Distribution products (*.asc, *.gz, and *.lz) now have 11 reproducible timestamps. Formerly, only the contents of the 12 compressed tarballs had reproducible timestamps. 13 14 Changes to commentary 15 16 The leapseconds file contains commentary about the IERS and NIST 17 last-modified and expiration timestamps for leap second data. 18 (Thanks to Judah Levine.) 19 20 21Release 2025b - 2025-03-22 13:40:46 -0700 22 23 Briefly: 24 New zone for Aysén Region in Chile which moves from -04/-03 to -03. 25 26 Changes to future timestamps 27 28 Chile's Aysén Region moves from -04/-03 to -03 year-round, joining 29 Magallanes Region. The region will not change its clocks on 30 2025-04-05 at 24:00, diverging from America/Santiago and creating a 31 new zone America/Coyhaique. (Thanks to Yonathan Dossow.) Model 32 this as a change to standard offset effective 2025-03-20. 33 34 Changes to past timestamps 35 36 Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at 37 year end. (Thanks to Roozbeh Pournader.) 38 39 Changes to code 40 41 'zic -l TIMEZONE -d . -l /some/other/file/system' no longer 42 attempts to create an incorrect symlink, and no longer has a 43 read buffer underflow. (Problem reported by Evgeniy Gorbanev.) 44 45 46Release 2025a - 2025-01-15 10:47:24 -0800 47 48 Briefly: 49 Paraguay adopted permanent -03 starting spring 2024. 50 Improve pre-1991 data for the Philippines. 51 Etc/Unknown is now reserved. 52 53 Changes to future timestamps 54 55 Paraguay stopped changing its clocks after the spring-forward 56 transition on 2024-10-06, so it is now permanently at -03. 57 (Thanks to Heitor David Pinto and Even Scharning.) 58 This affects timestamps starting 2025-03-22, as well as the 59 obsolescent tm_isdst flags starting 2024-10-15. 60 61 Changes to past timestamps 62 63 Correct timestamps for the Philippines before 1900, and from 1937 64 through 1990. (Thanks to P Chan for the heads-up and citations.) 65 This includes adjusting local mean time before 1899; fixing 66 transitions in September 1899, January 1937, and June 1954; adding 67 transitions in December 1941, November 1945, March and September 68 1977, and May and July 1990; and removing incorrect transitions in 69 March and September 1978. 70 71 Changes to data 72 73 Add zone1970.tab lines for the Concordia and Eyre Bird Observatory 74 research stations. (Thanks to Derick Rethans and Jule Dabars.) 75 76 Changes to code 77 78 strftime %s now generates the correct numeric string even when the 79 represented number does not fit into time_t. This is better than 80 generating the numeric equivalent of (time_t) -1, as strftime did 81 in TZDB releases 96a (when %s was introduced) through 2020a and in 82 releases 2022b through 2024b. It is also better than failing and 83 returning 0, as strftime did in releases 2020b through 2022a. 84 85 strftime now outputs an invalid conversion specifier as-is, 86 instead of eliding the leading '%', which confused debugging. 87 88 An invalid TZ now generates the time zone abbreviation "-00", not 89 "UTC", to help the user see that an error has occurred. (Thanks 90 to Arthur David Olson for suggesting a "wrong result".) 91 92 mktime and timeoff no longer incorrectly fail merely because a 93 struct tm component near INT_MIN or INT_MAX overflows when a 94 lower-order component carries into it. 95 96 TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ 97 string's time zone abbreviation, now defaults to 254 not 255. 98 This helps reduce the size of internal state from 25480 to 21384 99 on common platforms. This change should not be a problem, as 100 nobody uses such long "abbreviations" and the longstanding tzcode 101 maximum was 16 until release 2023a. For those who prefer no 102 arbitrary limits, you can now specify TZNAME_MAXIMUM values up to 103 PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently 104 misbehaved unless TZNAME_MAXIMUM was less than INT_MAX. 105 106 tzset and related functions no longer leak a file descriptor if 107 another thread forks or execs at about the same time and if the 108 platform has O_CLOFORK and O_CLOEXEC respectively. Also, the 109 functions no longer let a TZif file become a controlling terminal. 110 111 'zdump -' now reads TZif data from /dev/stdin. 112 (From a question by Arthur David Olson.) 113 114 Changes to documentation 115 116 The name Etc/Unknown is now reserved: it will not be used by TZDB. 117 This is for compatibility with CLDR, which uses the string 118 "Etc/Unknown" for an unknown or invalid timezone. (Thanks to 119 Justin Grant, Mark Davis, and Guy Harris.) 120 121 Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format. 122 123 124Release 2024b - 2024-09-04 12:27:47 -0700 125 126 Briefly: 127 Improve historical data for Mexico, Mongolia, and Portugal. 128 System V names are now obsolescent. 129 The main data form now uses %z. 130 The code now conforms to RFC 8536 for early timestamps. 131 Support POSIX.1-2024, which removes asctime_r and ctime_r. 132 Assume POSIX.2-1992 or later for shell scripts. 133 SUPPORT_C89 now defaults to 1. 134 135 Changes to past timestamps 136 137 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 138 being a separate Zone with differing behavior before April 2008. 139 This seems better given our wildly conflicting information about 140 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 141 142 Historical transitions for Mexico have been updated based on 143 official Mexican decrees. The affected timestamps occur during 144 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 145 The affected zones are America/Bahia_Banderas, America/Cancun, 146 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 147 America/Mazatlan, America/Merida, America/Mexico_City, 148 America/Monterrey, America/Ojinaga, and America/Tijuana. 149 (Thanks to Heitor David Pinto.) 150 151 Historical transitions for Portugal, represented by Europe/Lisbon, 152 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 153 close reading of old Portuguese legislation, replacing previous data 154 mainly originating from Whitman and Shanks & Pottenger. These 155 changes affect a few transitions in 1917-1921, 1924, and 1940 156 throughout these regions by a few hours or days, and various 157 timestamps between 1977 and 1993 depending on the region. In 158 particular, the Azores and Madeira did not observe DST from 1977 to 159 1981. Additionally, the adoption of standard zonal time in former 160 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 161 Asia/Dili by 22 minutes at the start of 1912. 162 (Thanks to Tim Parenti.) 163 164 Changes to past tm_isdst flags 165 166 The period from 1966-04-03 through 1966-10-02 in Portugal is now 167 modeled as DST, to more closely reflect how contemporaneous changes 168 in law entered into force. 169 170 Changes to data 171 172 Names present only for compatibility with UNIX System V 173 (last released in the 1990s) have been moved to 'backward'. 174 These names, which for post-1970 timestamps mostly just duplicate 175 data of geographical names, were confusing downstream uses. 176 Names moved to 'backward' are now links to geographical names. 177 This affects behavior for TZ='EET' for some pre-1981 timestamps, 178 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 179 some pre-1996 timestamps. Also, TZ='MET' now behaves like 180 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 181 Those needing the previous TZDB behavior, which does not match any 182 real-world clocks, can find the old entries in 'backzone'. 183 (Problem reported by Justin Grant.) 184 185 The main source files' time zone abbreviations now use %z, 186 supported by zic since release 2015f and used in vanguard form 187 since release 2022b. For example, America/Sao_Paulo now contains 188 the zone continuation line "-3:00 Brazil %z", which is less error 189 prone than the old "-3:00 Brazil -03/-02". This does not change 190 the represented data: the generated TZif files are unchanged. 191 Rearguard form still avoids %z, to support obsolescent parsers. 192 193 Asia/Almaty has been removed from zonenow.tab as it now agrees 194 with Asia/Tashkent for future timestamps, due to Kazakhstan's 195 2024-02-29 time zone change. Similarly, America/Scoresbysund 196 has been removed, as it now agrees with America/Nuuk due to 197 its 2024-03-31 time zone change. 198 199 Changes to code 200 201 localtime.c now always uses a TZif file's time type 0 to handle 202 timestamps before the file's first transition. Formerly, 203 localtime.c sometimes inferred a different time type, in order to 204 handle problematic data generated by zic 2018e or earlier. As it 205 is now safe to assume more recent versions of zic, there is no 206 longer a pressing need to fail to conform RFC 8536 section 3.2, 207 which requires using time type 0 in this situation. This change 208 does not affect behavior when reading TZif files generated by zic 209 2018f and later. 210 211 POSIX.1-2024 removes asctime_r and ctime_r and does not let 212 libraries define them, so remove them except when needed to 213 conform to earlier POSIX. These functions are dangerous as they 214 can overrun user buffers. If you still need them, add 215 -DSUPPORT_POSIX2008 to CFLAGS. 216 217 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 218 POSIX-conformance bug introduced in 2023a. 219 220 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 221 assumes POSIX.2-1992 or later, as practical porting targets now 222 all support that, and it uses some features from POSIX.1-2024 if 223 available. 224 225 Changes to build procedure 226 227 'make check' no longer requires curl and Internet access. 228 229 The build procedure now assumes POSIX.2-1992 or later, to simplify 230 maintenance. To build on Solaris 10, the only extant system still 231 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 232 233 Changes to documentation 234 235 The documentation now reflects POSIX.1-2024. 236 237 Changes to commentary 238 239 Commentary about historical transitions in Portugal and her former 240 colonies has been expanded with links to relevant legislation. 241 (Thanks to Tim Parenti.) 242 243 244Release 2024a - 2024-02-01 09:28:56 -0800 245 246 Briefly: 247 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 248 Palestine springs forward a week later after Ramadan. 249 zic no longer pretends to support indefinite-past DST. 250 localtime no longer mishandles Ciudad Juárez in 2422. 251 252 Changes to future timestamps 253 254 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 255 Asia/Qostanay which together represent the eastern portion of the 256 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 257 join the western portion. (Thanks to Zhanbolat Raimbekov.) 258 259 Palestine springs forward a week later than previously predicted 260 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 261 predictions to the second Saturday after Ramadan, not the first; 262 this also affects other predictions starting in 2039. 263 264 Changes to past timestamps 265 266 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 267 not 00:00. (Thanks to Đoàn Trần Công Danh.) 268 269 From 1947 through 1949, Toronto's transitions occurred at 02:00 270 not 00:00. (Thanks to Chris Walton.) 271 272 In 1911 Miquelon adopted standard time on June 15, not May 15. 273 274 Changes to code 275 276 The FROM and TO columns of Rule lines can no longer be "minimum" 277 or an abbreviation of "minimum", because TZif files do not support 278 DST rules that extend into the indefinite past - although these 279 rules were supported when TZif files had only 32-bit data, this 280 stopped working when 64-bit TZif files were introduced in 1995. 281 This should not be a problem for realistic data, since DST was 282 first used in the 20th century. As a transition aid, FROM columns 283 like "minimum" are now diagnosed and then treated as if they were 284 the year 1900; this should suffice for TZif files on old systems 285 with only 32-bit time_t, and it is more compatible with bugs in 286 2023c-and-earlier localtime.c. (Problem reported by Yoshito 287 Umaoka.) 288 289 localtime and related functions no longer mishandle some 290 timestamps that occur about 400 years after a switch to a time 291 zone with a DST schedule. In 2023d data this problem was visible 292 for some timestamps in November 2422, November 2822, etc. in 293 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 294 295 strftime %s now uses tm_gmtoff if available. (Problem and draft 296 patch reported by Dag-Erling Smørgrav.) 297 298 Changes to build procedure 299 300 The leap-seconds.list file is now copied from the IERS instead of 301 from its downstream counterpart at NIST, as the IERS version is 302 now in the public domain too and tends to be more up-to-date. 303 (Thanks to Martin Burnicki for liaisoning with the IERS.) 304 305 Changes to documentation 306 307 The strftime man page documents which struct tm members affect 308 which conversion specs, and that tzset is called. (Problems 309 reported by Robert Elz and Steve Summit.) 310 311 312Release 2023d - 2023-12-21 20:02:24 -0800 313 314 Briefly: 315 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 316 Vostok, Antarctica changed time zones on 2023-12-18. 317 Casey, Antarctica changed time zones five times since 2020. 318 Code and data fixes for Palestine timestamps starting in 2072. 319 A new data file zonenow.tab for timestamps starting now. 320 321 Changes to future timestamps 322 323 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 324 the rest of Greenland's timekeeping practice on 2024-03-31, by 325 changing its time zone from -01/+00 to -02/-01 at the same moment 326 as the spring-forward transition. Its clocks will therefore not 327 spring forward as previously scheduled. The time zone change 328 reverts to its common practice before 1981. (Thanks to Jule Dabars.) 329 330 Fix predictions for DST transitions in Palestine in 2072-2075, 331 correcting a typo introduced in 2023a. (Thanks to Jule Dabars.) 332 333 Changes to past and future timestamps 334 335 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 336 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 337 338 Change data for Casey, Antarctica to agree with timeanddate.com, 339 by adding five time zone changes since 2020. Casey is now at +08 340 instead of +11. 341 342 Changes to past tm_isdst flags 343 344 Much of Greenland, represented by America/Nuuk, changed its 345 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 346 This does not affect UTC offsets, only the tm_isdst flag. 347 (Thanks to Thomas M. Steenholdt.) 348 349 New data file 350 351 A new data file zonenow.tab helps configure applications that use 352 timestamps dated from now on. This simplifies configuration, 353 since users choose from a smaller Zone set. The file's format is 354 experimental and subject to change. 355 356 Changes to code 357 358 localtime.c no longer mishandles TZif files that contain a single 359 transition into a DST regime. Previously, it incorrectly assumed 360 DST was in effect before the transition too. (Thanks to Alois 361 Treindl for debugging help.) 362 363 localtime.c's timeoff no longer collides with OpenBSD 7.4. 364 365 The C code now uses _Generic only if __STDC_VERSION__ says the 366 compiler is C11 or later. 367 368 tzselect now optionally reads zonenow.tab, to simplify when 369 configuring only for timestamps dated from now on. 370 371 tzselect no longer creates temporary files. 372 373 tzselect no longer mishandles the following: 374 375 Spaces and most other special characters in BUGEMAIL, PACKAGE, 376 TZDIR, and VERSION. 377 378 TZ strings when using mawk 1.4.3, which mishandles regular 379 expressions of the form /X{2,}/. 380 381 ISO 6709 coordinates when using an awk that lacks the GNU 382 extension of newlines in -v option-arguments. 383 384 Non UTF-8 locales when using an iconv command that lacks the GNU 385 //TRANSLIT extension. 386 387 zic no longer mishandles data for Palestine after the year 2075. 388 Previously, it incorrectly omitted post-2075 transitions that are 389 predicted for just before and just after Ramadan. (Thanks to Ken 390 Murchison for debugging help.) 391 392 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 393 (Problem reported by Rune Torgersen.) 394 395 Changes to build procedure 396 397 The Makefile is now more compatible with POSIX: 398 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 399 * It no longer uses its own 'cc' in place of CC. 400 * It now uses ARFLAGS, with default specified by POSIX. 401 * It does not use LFLAGS incompatibly with POSIX. 402 * It uses the special .POSIX target. 403 * It quotes special characters more carefully. 404 * It no longer mishandles builds in an ISO 8859 locale. 405 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 406 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 407 now treated like TZDIR as they have similar roles. 408 409 Changes to commentary 410 411 Limitations and hazards of the optional support for obsolescent 412 C89 platforms are documented better, along with a tentative 413 schedule for removing this support. 414 415 416Release 2023c - 2023-03-28 12:42:14 -0700 417 418 Changes to past and future timestamps 419 420 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 421 (Thanks to Rany Hany for the heads-up.) 422 423 424Release 2023b - 2023-03-23 19:50:38 -0700 425 426 Changes to future timestamps 427 428 This year Lebanon springs forward April 20/21 not March 25/26. 429 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 430 431 432Release 2023a - 2023-03-22 12:39:33 -0700 433 434 Briefly: 435 Egypt now uses DST again, from April through October. 436 This year Morocco springs forward April 23, not April 30. 437 Palestine delays the start of DST this year. 438 Much of Greenland still uses DST from 2024 on. 439 America/Yellowknife now links to America/Edmonton. 440 tzselect can now use current time to help infer timezone. 441 The code now defaults to C99 or later. 442 Fix use of C23 attributes. 443 444 Changes to future timestamps 445 446 Starting in 2023, Egypt will observe DST from April's last Friday 447 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 448 Assume the transition times are 00:00 and 24:00, respectively. 449 450 In 2023 Morocco's spring-forward transition after Ramadan 451 will occur April 23, not April 30. (Thanks to Milamber.) 452 Adjust predictions for future years accordingly. This affects 453 predictions for 2023, 2031, 2038, and later years. 454 455 This year Palestine will delay its spring forward from 456 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 457 Make guesses for future Ramadans too. 458 459 Much of Greenland, represented by America/Nuuk, will continue to 460 observe DST using European Union rules. When combined with 461 Greenland's decision not to change the clocks in fall 2023, 462 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 463 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 464 This change from 2022g doesn't affect timestamps until 2024-03-30, 465 and doesn't affect tm_isdst until 2023-03-25. 466 467 Changes to past timestamps 468 469 America/Yellowknife has changed from a Zone to a backward 470 compatibility Link, as it no longer differs from America/Edmonton 471 since 1970. (Thanks to Almaz Mingaleev.) This affects some 472 pre-1948 timestamps. The old data are now in 'backzone'. 473 474 Changes to past time zone abbreviations 475 476 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 477 use the abbreviations MSK/MSD instead of numeric abbreviations, 478 for consistency with other timezones observing Moscow time. 479 480 Changes to code 481 482 You can now tell tzselect local time, to simplify later choices. 483 Select the 'time' option in its first prompt. 484 485 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 486 abbreviations to N bytes (default 255). The reference runtime 487 library now rejects POSIX-style TZ strings that contain longer 488 abbreviations, treating them as UTC. Previously the limit was 489 platform dependent and abbreviations were silently truncated to 490 16 bytes even when the limit was greater than 16. 491 492 The code by default is now designed for C99 or later. To build on 493 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 494 work on C89 platforms that also support C99 'long long' and 495 perhaps a few other extensions to C89. To support C89 callers of 496 tzcode's library, compile with -DSUPPORT_C89; however, this could 497 trigger latent bugs in C99-or-later callers. The two new macros 498 are transitional aids planned to be removed in a future version 499 (say, in 2029), when C99 or later will be required. 500 501 The code now builds again on pre-C99 platforms, if you compile 502 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 503 504 On C23-compatible platforms tzcode no longer uses syntax like 505 'static [[noreturn]] void usage(void);'. Instead, it uses 506 '[[noreturn]] static void usage(void);' as strict C23 requires. 507 (Problem reported by Houge Langley.) 508 509 The code's functions now constrain their arguments with the C 510 'restrict' keyword consistently with their documentation. 511 This may allow future optimizations. 512 513 zdump again builds standalone with ckdadd and without setenv, 514 fixing a bug introduced in 2022g. (Problem reported by panic.) 515 516 leapseconds.awk can now process a leap seconds file that never 517 expires; this might be useful if leap seconds are discontinued. 518 519 Changes to commentary 520 521 tz-link.html has a new section "Coordinating with governments and 522 distributors". (Thanks to Neil Fuller for some of the text.) 523 524 To improve tzselect diagnostics, zone1970.tab's comments column is 525 now limited to countries that have multiple timezones. 526 527 Note that there are plans to discontinue leap seconds by 2035. 528 529 530Release 2022g - 2022-11-29 08:58:31 -0800 531 532 Briefly: 533 The northern edge of Chihuahua changes to US timekeeping. 534 Much of Greenland stops changing clocks after March 2023. 535 Fix some pre-1996 timestamps in northern Canada. 536 C89 is now deprecated; please use C99 or later. 537 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 538 In C code, use more C23 features if available. 539 C23 timegm now supported by default 540 Fixes for unlikely integer overflows 541 542 Changes to future timestamps 543 544 In the Mexican state of Chihuahua, the border strip near the US 545 will change to agree with nearby US locations on 2022-11-30. 546 The strip's western part, represented by Ciudad Juárez, switches 547 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 548 The eastern part, represented by Ojinaga, will observe US DST next 549 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 550 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 551 552 Much of Greenland, represented by America/Nuuk, stops observing 553 winter time after March 2023, so its daylight saving time becomes 554 standard time. (Thanks to Jonas Nyrup and Jürgen Appel.) 555 556 Changes to past timestamps 557 558 Changes for pre-1996 northern Canada (thanks to Chris Walton): 559 560 Merge America/Iqaluit and America/Pangnirtung into the former, 561 with a backward compatibility link for the latter name. 562 There is no good evidence the two locations differ since 1970. 563 This change affects pre-1996 America/Pangnirtung timestamps. 564 565 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 566 Yellowknife did not observe DST in 1965, and did observe DST 567 from 1972 through 1979. 568 569 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 570 571 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 572 (Thanks to Alois Treindl.) 573 574 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 575 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 576 577 Changes to code 578 579 Although tzcode still works with C89, bugs found in recent routine 580 maintenance indicate that bitrot has set in and that in practice 581 C89 is no longer used to build tzcode. As it is a maintenance 582 burden, support for C89 is planned to be removed soon. Instead, 583 please use compilers compatible with C99, C11, C17, or C23. 584 585 timegm, which tzcode implemented in 1989, will finally be 586 standardized 34 years later as part of C23, so timegm is now 587 supported even if STD_INSPIRED is not defined. 588 589 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 590 (Problem reported by Đoàn Trần Công Danh.) 591 592 Fix bug in zic on hosts where malloc(0) yields NULL on success. 593 (Problem reported by Tim McBrayer for AIX 6.1.) 594 595 Fix zic configuration to avoid linkage failures on some platforms. 596 (Problems reported by Gilmore Davidson and Igor Ivanov.) 597 598 Work around MS-Windows nmake incompatibility with POSIX. 599 (Problem reported by Manuela Friedrich.) 600 601 Port mktime and strftime to debugging platforms where accessing 602 uninitialized data has undefined behavior (strftime problem 603 reported by Robert Elz). 604 605 Check more carefully for unlikely integer overflows, preferring 606 C23 <stdckdint.h> to overflow checking by hand, as the latter has 607 had obscure bugs. 608 609 Changes to build procedure 610 611 New Makefile rule check_mild that skips checking whether Link 612 lines are in the file 'backward'. (Inspired by a suggestion from 613 Stephen Colebourne.) 614 615 616Release 2022f - 2022-10-28 18:04:57 -0700 617 618 Briefly: 619 Mexico will no longer observe DST except near the US border. 620 Chihuahua moves to year-round -06 on 2022-10-30. 621 Fiji no longer observes DST. 622 Move links to 'backward'. 623 In vanguard form, GMT is now a Zone and Etc/GMT a link. 624 zic now supports links to links, and vanguard form uses this. 625 Simplify four Ontario zones. 626 Fix a Y2438 bug when reading TZif data. 627 Enable 64-bit time_t on 32-bit glibc platforms. 628 Omit large-file support when no longer needed. 629 In C code, use some C23 features if available. 630 Remove no-longer-needed workaround for Qt bug 53071. 631 632 Changes to future timestamps 633 634 Mexico will no longer observe DST after 2022, except for areas 635 near the US border that continue to observe US DST rules. 636 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 637 from -07 (-06 with DST) to year-round -06, thus not changing 638 its clocks that day. The new law states that Chihuahua 639 near the US border no longer observes US DST. 640 (Thanks to gera for the heads-up about Chihuahua.) 641 642 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 643 For now, assume DST is suspended indefinitely. 644 645 Changes to data 646 647 Move links to 'backward' to ease and simplify link maintenance. 648 This affects generated data only if you use 'make BACKWARD='. 649 650 GMT is now a Zone and Etc/GMT a link instead of vice versa, 651 as GMT is needed for leap second support whereas Etc/GMT is not. 652 However, this change exposes a bug in TZUpdater 2.3.2 so it is 653 present only in vanguard form for now. 654 655 Vanguard form now uses links to links, as zic now supports this. 656 657 Changes to past timestamps 658 659 Simplify four Ontario zones, as most of the post-1970 differences 660 seem to have been imaginary. (Problem reported by Chris Walton.) 661 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 662 to 'backzone'; backward-compatibility links still work, albeit 663 with some different timestamps before November 2005. 664 665 Changes to code 666 667 zic now supports links to links regardless of input line order. 668 For example, if Australia/Sydney is a Zone, the lines 669 Link Australia/Canberra Australia/ACT 670 Link Australia/Sydney Australia/Canberra 671 now work correctly, even though the shell commands 672 ln Australia/Canberra Australia/ACT 673 ln Australia/Sydney Australia/Canberra 674 would fail because the first command attempts to use a link 675 Australia/Canberra that does not exist until after the second 676 command is executed. Previously, zic had unspecified behavior if 677 a Link line's target was another link, and zic often misbehaved if 678 a Link line's target was a later Link line. 679 680 Fix line number in zic's diagnostic for a link to a link. 681 682 Fix a bug that caused localtime to mishandle timestamps starting 683 in the year 2438 when reading data generated by 'zic -b fat' when 684 distant-future DST transitions occur at times given in standard 685 time or in UT, not the usual case of local time. This occurs when 686 the corresponding .zi Rule lines specify DST transitions with TO 687 columns of 'max' and AT columns that end in 's' or 'u'. The 688 number 2438 comes from the 32-bit limit in the year 2038, plus the 689 400-year Gregorian cycle. (Problem reported by Bradley White.) 690 691 On glibc 2.34 and later, which optionally supports 64-bit time_t 692 on platforms like x86 where time_t was traditionally 32 bits, 693 default time_t to 64 instead of 32 bits. This lets functions like 694 localtime support timestamps after the year 2038, and fixes 695 year-2038 problems in zic when accessing files dated after 2038. 696 To continue to limit time_t to 32 bits on these platforms, use 697 "make CFLAGS='-D_TIME_BITS=32'". 698 699 In C code, do not enable large-file support on platforms like AIX 700 and macOS that no longer need it now that tzcode does not use 701 off_t or related functions like 'stat'. Large-file support is 702 still enabled by default on GNU/Linux, as it is needed for 64-bit 703 time_t support. 704 705 In C code, prefer C23 keywords to pre-C23 macros for alignof, 706 bool, false, and true. Also, use the following C23 features if 707 available: __has_include, unreachable. 708 709 zic no longer works around Qt bug 53071, as the relevant Qt 710 releases have been out of support since 2019. This change affects 711 only fat TZif files, as thin files never had the workaround. 712 713 zdump no longer modifies the environ vector when compiled on 714 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 715 This avoid undefined behavior on POSIX platforms. 716 717 718Release 2022e - 2022-10-11 11:13:02 -0700 719 720 Briefly: 721 Jordan and Syria switch from +02/+03 with DST to year-round +03. 722 723 Changes to future timestamps 724 725 Jordan and Syria are abandoning the DST regime and are changing to 726 permanent +03, so they will not fall back from +03 to +02 on 727 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 728 729 Changes to past timestamps 730 731 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 732 733 Changes to past time zone abbreviations and DST flags 734 735 The temporary advancement of clocks in central Mexico in summer 736 1931 is now treated as daylight saving time, instead of as two 737 changes to standard time. 738 739 740Release 2022d - 2022-09-23 12:02:57 -0700 741 742 Briefly: 743 Palestine transitions are now Saturdays at 02:00. 744 Simplify three Ukraine zones into one. 745 746 Changes to future timestamps 747 748 Palestine now springs forward and falls back at 02:00 on the 749 first Saturday on or after March 24 and October 24, respectively. 750 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 751 (Thanks to Heba Hamad.) 752 753 Changes to past timestamps 754 755 Simplify three Ukraine zones to one, since the post-1970 756 differences seem to have been imaginary. Move Europe/Uzhgorod and 757 Europe/Zaporozhye to 'backzone'; backward-compatibility links 758 still work, albeit with different timestamps before October 1991. 759 760 761Release 2022c - 2022-08-15 17:47:18 -0700 762 763 Briefly: 764 Work around awk bug in FreeBSD, macOS, etc. 765 Improve tzselect on intercontinental Zones. 766 767 Changes to code 768 769 Work around a bug in onetrueawk that broke commands like 770 'make traditional_tarballs' on FreeBSD, macOS, etc. 771 (Problem reported by Deborah Goldsmith.) 772 773 Add code to tzselect that uses experimental structured comments in 774 zone1970.tab to clarify whether Zones like Africa/Abidjan and 775 Europe/Istanbul cross continent or ocean boundaries. 776 (Inspired by a problem reported by Peter Krefting.) 777 778 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 779 directory /a/b already exists. 780 781 Remove zoneinfo2tdf.pl, as it was unused and triggered false 782 malware alarms on some email servers. 783 784 785Release 2022b - 2022-08-10 15:38:32 -0700 786 787 Briefly: 788 Chile's DST is delayed by a week in September 2022. 789 Iran no longer observes DST after 2022. 790 Rename Europe/Kiev to Europe/Kyiv. 791 New zic -R option 792 Vanguard form now uses %z. 793 Finish moving duplicate-since-1970 zones to 'backzone'. 794 New build option PACKRATLIST 795 New tailored_tarballs target, replacing rearguard_tarballs 796 797 Changes to future timestamps 798 799 Chile's 2022 DST start is delayed from September 4 to September 11. 800 (Thanks to Juan Correa.) 801 802 Iran plans to stop observing DST permanently, after it falls back 803 on 2022-09-21. (Thanks to Ali Mirjamali.) 804 805 Changes to past timestamps 806 807 Finish moving to 'backzone' the location-based zones whose 808 timestamps since 1970 are duplicates; adjust links accordingly. 809 This change ordinarily affects only pre-1970 timestamps, and with 810 the new PACKRATLIST option it does not affect any timestamps. 811 In this round the affected zones are Antarctica/Vostok, 812 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 813 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 814 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 815 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 816 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 817 Pacific/Wake and Pacific/Wallis, and the affected links are 818 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 819 Pacific/Truk, and Pacific/Yap. 820 821 From fall 1994 through fall 1995, Shanks wrote that Crimea's 822 DST transitions were at 02:00 standard time, not at 00:00. 823 (Thanks to Michael Deckers.) 824 825 Iran adopted standard time in 1935, not 1946. In 1977 it observed 826 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 827 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 828 transition was on 05-27, not 03-21. 829 (Thanks to Roozbeh Pournader and Francis Santoni.) 830 831 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 832 considered DST, not standard time. Santiago and environs had moved 833 their clocks back to rejoin the rest of mainland Chile; put this 834 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 835 836 Some old, small clock transitions have been removed, as people at 837 the time did not change their clocks. This affects Asia/Hong_Kong 838 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 839 840 Changes to zone name 841 842 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 843 English now. Spelling of other names in Ukraine has not yet 844 demonstrably changed in common English practice so for now these 845 names retain old spellings, as in other countries (e.g., 846 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 847 848 Changes to code 849 850 zic has a new option '-R @N' to output explicit transitions < N. 851 (Need suggested by Almaz Mingaleev.) 852 853 'zic -r @N' no longer outputs bad data when N < first transition. 854 (Problem introduced in 2021d and reported by Peter Krefting.) 855 856 zic now checks its input for NUL bytes and unterminated lines, and 857 now supports input line lengths up to 2048 (not 512) bytes. 858 859 gmtime and related code now use the abbreviation "UTC" not "GMT". 860 POSIX is being revised to require this. 861 862 When tzset and related functions set vestigial static variables 863 like tzname, they now prefer specified timestamps to unspecified ones. 864 (Problem reported by Almaz Mingaleev.) 865 866 zic no longer complains "can't determine time zone abbreviation to 867 use just after until time" when a transition to a new standard 868 time occurs simultaneously with the first DST fallback transition. 869 870 Changes to build procedure 871 872 Source data in vanguard form now uses the %z notation, introduced 873 in release 2015f. For example, for America/Sao_Paulo vanguard 874 form contains the zone continuation line "-3:00 Brazil %z", which 875 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 876 used in main and rearguard forms. The plan is for the main form 877 to use %z eventually; in the meantime maintainers of zi parsers 878 are encouraged to test the parsers on vanguard.zi. 879 880 The Makefile has a new PACKRATLIST option to select a subset of 881 'backzone'. For example, 'make PACKRATDATA=backzone 882 PACKRATLIST=zone.tab' now generates TZif files identical to those 883 of the global-tz project. 884 885 The Makefile has a new tailored_tarballs target for generating 886 special-purpose tarballs. It generalizes and replaces the 887 rearguard_tarballs target and related targets and macros, which 888 are now obsolescent. 889 890 'make install' now defaults LOCALTIME to Factory not GMT, 891 which means the default abbreviation is now "-00" not "GMT". 892 893 Remove the posix_packrat target, marked obsolescent in 2016a. 894 895 896Release 2022a - 2022-03-15 23:02:01 -0700 897 898 Briefly: 899 Palestine will spring forward on 2022-03-27, not -03-26. 900 zdump -v now outputs better failure indications. 901 Bug fixes for code that reads corrupted TZif data. 902 903 Changes to future timestamps 904 905 Palestine will spring forward on 2022-03-27, not 2022-03-26. 906 (Thanks to Heba Hamad.) Predict future transitions for first 907 Sunday >= March 25. Additionally, predict fallbacks to be the first 908 Friday on or after October 23, not October's last Friday, to be more 909 consistent with recent practice. The first differing fallback 910 prediction is on 2025-10-24, not 2025-10-31. 911 912 Changes to past timestamps 913 914 From 1992 through spring 1996, Ukraine's DST transitions were at 915 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 916 917 Chile's Santiago Mean Time and its LMT precursor have been adjusted 918 eastward by 1 second to align with past and present law. 919 920 Changes to commentary 921 922 Add several references for Chile's 1946/1947 transitions, some of 923 which only affected portions of the country. 924 925 Changes to code 926 927 Fix bug when mktime gets confused by truncated TZif files with 928 unspecified local time. (Problem reported by Almaz Mingaleev.) 929 930 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 931 (Problem reported by Christos Zoulas.) 932 933 When reading a version 2 or later TZif file, the TZif reader now 934 validates the version 1 header and data block only enough to skip 935 over them, as recommended by RFC 8536 section 4. Also, the TZif 936 reader no longer mistakenly attempts to parse a version 1 TZIf 937 file header as a TZ string. 938 939 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 940 when local time and UT cannot be determined for a timestamp. 941 942 Changes to build procedure 943 944 Distribution tarballs now use standard POSIX.1-1988 ustar format 945 instead of GNU format. Although the formats are almost identical 946 for these tarballs, ustar headers' magic fields contain "ustar" 947 instead of "ustar ", and their version fields contain "00" instead 948 of " ". The two formats are planned to diverge more significantly 949 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 950 format becomes obsolete and the tarballs switch to pax format, an 951 extension of ustar. For details about these formats, please see 952 "pax - portable archive interchange", IEEE Std 1003.1-2017, 953 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 954 955 956Release 2021e - 2021-10-21 18:41:00 -0700 957 958 Changes to future timestamps 959 960 Palestine will fall back 10-29 (not 10-30) at 01:00. 961 (Thanks to P Chan and Heba Hemad.) 962 963 964Release 2021d - 2021-10-15 13:48:18 -0700 965 966 Briefly: 967 Fiji suspends DST for the 2021/2022 season. 968 'zic -r' marks unspecified timestamps with "-00". 969 970 Changes to future timestamps 971 972 Fiji will suspend observance of DST for the 2021/2022 season. 973 Assume for now that it will return next year. (Thanks to Jashneel 974 Kumar and P Chan.) 975 976 Changes to code 977 978 'zic -r' now uses "-00" time zone abbreviations for intervals 979 with UT offsets that are unspecified due to -r truncation. 980 This implements a change in draft Internet RFC 8536bis. 981 982 983Release 2021c - 2021-10-01 14:21:49 -0700 984 985 Briefly: 986 Revert most 2021b changes to 'backward'. 987 Fix 'zic -b fat' bug in pre-1970 32-bit data. 988 Fix two Link line typos. 989 Distribute SECURITY file. 990 991 This release is intended as a bugfix release, to fix compatibility 992 problems and typos reported since 2021b was released. 993 994 Changes to Link directives 995 996 Revert almost all of 2021b's changes to the 'backward' file, 997 by moving Link directives back to where they were in 2021a. 998 Although 'zic' doesn't care which source file contains a Link 999 directive, some downstream uses ran into trouble with the move. 1000 (Problem reported by Stephen Colebourne for Joda-Time.) 1001 1002 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 1003 (problem reported by Chris Walton). 1004 1005 Fix 'backzone' typo that linked America/Virgin to the wrong 1006 location (problem reported by Michael Deckers). 1007 1008 Changes to code 1009 1010 Fix a bug in 'zic -b fat' that caused old timestamps to be 1011 mishandled in 32-bit-only readers (problem reported by Daniel 1012 Fischer). 1013 1014 Changes to documentation 1015 1016 Distribute the SECURITY file (problem reported by Andreas Radke). 1017 1018 1019Release 2021b - 2021-09-24 16:23:00 -0700 1020 1021 Briefly: 1022 Jordan now starts DST on February's last Thursday. 1023 Samoa no longer observes DST. 1024 Merge more location-based Zones whose timestamps agree since 1970. 1025 Move some backward-compatibility links to 'backward'. 1026 Rename Pacific/Enderbury to Pacific/Kanton. 1027 Correct many pre-1993 transitions in Malawi, Portugal, etc. 1028 zic now creates each output file or link atomically. 1029 zic -L no longer omits the POSIX TZ string in its output. 1030 zic fixes for truncation and leap second table expiration. 1031 zic now follows POSIX for TZ strings using all-year DST. 1032 Fix some localtime crashes and bugs in obscure cases. 1033 zdump -v now outputs more-useful boundary cases. 1034 tzfile.5 better matches a draft successor to RFC 8536. 1035 A new file SECURITY. 1036 1037 This release is prompted by recent announcements by Jordan and Samoa. 1038 It incorporates many other changes that had accumulated since 2021a. 1039 However, it omits most proposed changes that merged all Zones 1040 agreeing since 1970, as concerns were raised about doing too many of 1041 these changes at once. It does keeps some of these changes in the 1042 interest of making tzdb more equitable one step at a time; see 1043 "Merge more location-based Zones" below. 1044 1045 Changes to future timestamps 1046 1047 Jordan now starts DST on February's last Thursday. 1048 (Thanks to Steffen Thorsen.) 1049 1050 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1051 1052 Changes to zone name 1053 1054 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1055 Enderbury in 1993, we did not know that it is uninhabited and that 1056 Kanton (population two dozen) is the only inhabited location in 1057 that timezone. The old name is now a backward-compatibility link. 1058 1059 Changes to past timestamps 1060 1061 Correct many pre-1993 transitions, fixing entries originally 1062 derived from Shanks, Whitman, and Mundell. The fixes include: 1063 - Barbados: standard time was introduced in 1911, not 1932; and 1064 DST was observed in 1942-1944 1065 - Cook Islands: In 1899 they switched from east to west of GMT, 1066 celebrating Christmas for two days. They (and Niue) switched 1067 to standard time in 1952, not 1901. 1068 - Guyana: corrected LMT for Georgetown; the introduction of 1069 standard time in 1911, not 1915; and corrections to 1975 and 1070 1992 transitions 1071 - Kanton: uninhabited before 1937-08-31 1072 - Niue: only observed -11:20 from 1952 through 1964, then went to 1073 -11 instead of -11:30 1074 - Portugal: DST was observed in 1950 1075 - Tonga: corrected LMT; the introduction of standard time in 1945, 1076 not 1901; and corrections to the transition from +12:20 to +13 1077 in 1961, not 1941 1078 Additional fixes to entries in the 'backzone' file include: 1079 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1080 - The Gambia: 1933 and 1942 transitions 1081 - Malawi: several 1911 through 1925 transitions 1082 - Sierra Leone: several 1913 through 1941 transitions, and DST 1083 was NOT observed in 1957 through 1962 1084 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1085 Alois Treindl.) 1086 1087 Merge more location-based Zones whose timestamps agree since 1970, 1088 as pre-1970 timestamps are out of scope. This is part of a 1089 process that has been ongoing since 2013. This does not affect 1090 post-1970 timestamps, and timezone historians who build with 'make 1091 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1092 When merging, keep the most-populous location's data, and move 1093 data for other locations to 'backzone' with a backward 1094 link in 'backward'. For example, move America/Creston data to 1095 'backzone' with a link in 'backward' from America/Phoenix because 1096 the two timezones' timestamps agree since 1970; this change 1097 affects some pre-1968 timestamps in America/Creston because 1098 Creston and Phoenix disagreed before 1968. The affected Zones 1099 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1100 America/Creston, America/Curacao, America/Nassau, 1101 America/Port_of_Spain, Antarctica/DumontDUrville, and 1102 Antarctica/Syowa. 1103 1104 Changes to maintenance procedure 1105 1106 The new file SECURITY covers how to report security-related bugs. 1107 1108 Several backward-compatibility links have been moved to the 1109 'backward' file. These links, which range from Africa/Addis_Ababa 1110 to Pacific/Saipan, are only for compatibility with now-obsolete 1111 guidelines suggesting an entry for every ISO 3166 code. 1112 The intercontinental convenience links Asia/Istanbul and 1113 Europe/Nicosia have also been moved to 'backward'. 1114 1115 Changes to code 1116 1117 zic now creates each output file or link atomically, 1118 possibly by creating a temporary file and then renaming it. 1119 This avoids races where a TZ setting would temporarily stop 1120 working while zic was installing a replacement file or link. 1121 1122 zic -L no longer omits the POSIX TZ string in its output. 1123 Starting with 2020a, zic -L truncated its output according to the 1124 "Expires" directive or "#expires" comment in the leapseconds file. 1125 The resulting TZif files omitted daylight saving transitions after 1126 the leap second table expired, which led to far less accurate 1127 predictions of times after the expiry. Although future timestamps 1128 cannot be converted accurately in the presence of leap seconds, it 1129 is more accurate to convert near-future timestamps with a few 1130 seconds error than with an hour error, so zic -L no longer 1131 truncates output in this way. 1132 1133 Instead, when zic -L is given the "Expires" directive, it now 1134 outputs the expiration by appending a no-change entry to the leap 1135 second table. Although this should work well with most TZif 1136 readers, it does not conform to Internet RFC 8536 and some pickier 1137 clients (including tzdb 2017c through 2021a) reject it, so 1138 "Expires" directives are currently disabled by default. To enable 1139 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1140 this new feature it is marked with a new TZif version number 4, 1141 a format intended to be documented in a successor to RFC 8536. 1142 The old-format "#expires" comments are now treated solely as 1143 comments and have no effect on the TZif files. 1144 1145 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1146 that omits leap second information for the range LO..B when LO 1147 falls between two leap seconds A and B. Instead, it generates a 1148 TZif version 4 file that represents the previously missing 1149 information. 1150 1151 The TZif reader now allows the leap second table to begin with a 1152 correction other than -1 or +1, and to contain adjacent 1153 transitions with equal corrections. This supports TZif version 4. 1154 1155 The TZif reader now lets leap seconds occur less than 28 days 1156 apart. This supports possible future TZif extensions. 1157 1158 Fix bug that caused 'localtime' etc. to crash when TZ was 1159 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1160 not conform to POSIX but does conform to Internet RFC 8536. 1161 1162 Fix another bug that caused 'localtime' etc. to crash when TZ was 1163 set to a POSIX-conforming but unusual TZ string like 1164 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1165 1166 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1167 TZif files containing leap seconds after the last explicit 1168 transition in the table, or when handling far-future timestamps 1169 in slim TZif files lacking leap seconds. 1170 1171 Fix localtime misbehavior involving positive leap seconds. 1172 This change affects only behavior for "right" system time, 1173 which contains leap seconds, and only if the UT offset is 1174 not a multiple of 60 seconds when a positive leap second occurs. 1175 (No such timezone exists in tzdb, luckily.) Without the fix, 1176 the timestamp was ambiguous during a positive leap second. 1177 With the fix, any seconds occurring after a positive leap second 1178 and within the same localtime minute are counted through 60, not 1179 through 59; their UT offset (tm_gmtoff) is the same as before. 1180 Here is how the fix affects timestamps in a timezone with UT 1181 offset +01:23:45 (5025 seconds) and with a positive leap second at 1182 1972-06-30 23:59:60 UTC (78796800): 1183 1184 time_t without the fix with the fix 1185 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1186 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1187 ... 1188 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1189 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1190 1191 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1192 civil time changes a few seconds before time_t wraps around, when 1193 leap seconds are enabled. 1194 1195 Fix bug in zic -r; in some cases, the dummy time type after the 1196 last time transition disagreed with the TZ string, contrary to 1197 Internet RFC 8563 section 3.3. 1198 1199 Fix a bug with 'zic -r @X' when X is a negative leap second that 1200 has a nonnegative correction. Without the fix, the output file 1201 was truncated so that X appeared to be a positive leap second. 1202 Fix a similar, even less likely bug when truncating at a positive 1203 leap second that has a nonpositive correction. 1204 1205 zic -r now reports an error if given rolling leap seconds, as this 1206 usage has never generally worked and is evidently unused. 1207 1208 zic now generates a POSIX-conforming TZ string for TZif files 1209 where all-year DST is predicted for the indefinite future. 1210 For example, for all-year Eastern Daylight Time, zic now generates 1211 "XXX3EDT4,0/0,J365/23" where it previously generated 1212 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1213 noting the possibility of POSIX conformance.) 1214 1215 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1216 noting it wasn't needed). 1217 1218 When reading slim TZif files, zdump no longer mishandles leap 1219 seconds on the rare platforms where time_t counts leap seconds, 1220 fixing a bug introduced in 2014g. 1221 1222 zdump -v now outputs timestamps at boundaries of what localtime 1223 and gmtime can represent, instead of the less useful timestamps 1224 one day after the minimum and one day before the maximum. 1225 (Thanks to Arthur David Olson for prototype code, and to Manuela 1226 Friedrich for debugging help.) 1227 1228 zdump's -c and -t options are now consistently inclusive for the 1229 lower time bound and exclusive for the upper. Formerly they were 1230 inconsistent. (Confusion noted by Martin Burnicki.) 1231 1232 Changes to build procedure 1233 1234 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1235 non-POSIX hosts where malloc doesn't set errno. 1236 (Problem reported by Jan Engelhardt.) 1237 1238 Changes to documentation 1239 1240 tzfile.5 better matches a draft successor to RFC 8536 1241 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1242 1243 1244Release 2021a - 2021-01-24 10:54:57 -0800 1245 1246 Changes to future timestamps 1247 1248 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1249 (Thanks to Steffen Thorsen.) 1250 1251 1252Release 2020f - 2020-12-29 00:17:46 -0800 1253 1254 Change to build procedure 1255 1256 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1257 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1258 1259 1260Release 2020e - 2020-12-22 15:14:34 -0800 1261 1262 Briefly: 1263 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1264 1265 Changes to future timestamps 1266 1267 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1268 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1269 1270 Changes to past timestamps 1271 1272 Correct many pre-1986 transitions, fixing entries originally 1273 derived from Shanks. The fixes include: 1274 - Australia: several 1917 through 1971 transitions 1275 - The Bahamas: several 1941 through 1945 transitions 1276 - Bermuda: several 1917 through 1956 transitions 1277 - Belize: several 1942 through 1968 transitions 1278 - Ghana: several 1915 through 1956 transitions 1279 - Israel and Palestine: several 1940 through 1985 transitions 1280 - Kenya and adjacent: several 1908 through 1960 transitions 1281 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1282 through 1919 transitions 1283 - Seychelles: the introduction of standard time in 1907, not 1906 1284 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1285 (Thanks to P Chan.) 1286 1287 Because of the Australia change, Australia/Currie (King Island) is 1288 no longer needed, as it is identical to Australia/Hobart for all 1289 timestamps since 1970 and was therefore created by mistake. 1290 Australia/Currie has been moved to the 'backward' file and its 1291 corrected data moved to the 'backzone' file. 1292 1293 Changes to past time zone abbreviations and DST flags 1294 1295 To better match legislation in Turks and Caicos, the 2015 shift to 1296 year-round observance of -04 is now modeled as AST throughout before 1297 returning to Eastern Time with US DST in 2018, rather than as 1298 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1299 1300 Changes to documentation 1301 1302 The zic man page now documents zic's coalescing of transitions 1303 when a zone falls back just before DST springs forward. 1304 1305 1306Release 2020d - 2020-10-21 11:24:13 -0700 1307 1308 Briefly: 1309 Palestine ends DST earlier than predicted, on 2020-10-24. 1310 1311 Changes to past and future timestamps 1312 1313 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1314 as previously predicted (thanks to Sharef Mustafa.) Its 1315 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1316 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1317 its spring 2020 transition was on March 28 at 00:00, not March 27 1318 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1319 Asia/Hebron. Assume future spring and fall transitions will be on 1320 the Saturday preceding the last Sunday of March and October, 1321 respectively. 1322 1323 1324Release 2020c - 2020-10-16 11:15:53 -0700 1325 1326 Briefly: 1327 Fiji starts DST later than usual, on 2020-12-20. 1328 1329 Changes to future timestamps 1330 1331 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1332 previously predicted. DST will still end on 2021-01-17. 1333 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1334 the later-than-usual start date is a one-time departure from the 1335 recent pattern. 1336 1337 Changes to build procedure 1338 1339 Rearguard tarballs now contain an empty file pacificnew. 1340 Some older downstream software expects this file to exist. 1341 (Problem reported by Mike Cullinan.) 1342 1343 1344Release 2020b - 2020-10-06 18:35:04 -0700 1345 1346 Briefly: 1347 Revised predictions for Morocco's changes starting in 2023. 1348 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1349 Macquarie Island has stayed in sync with Tasmania since 2011. 1350 Casey, Antarctica is at +08 in winter and +11 in summer. 1351 zic no longer supports -y, nor the TYPE field of Rules. 1352 1353 Changes to future timestamps 1354 1355 Morocco's spring-forward after Ramadan is now predicted to occur 1356 no sooner than two days after Ramadan, instead of one day. 1357 (Thanks to Milamber.) The first altered prediction is for 2023, 1358 now predicted to spring-forward on April 30 instead of April 23. 1359 1360 Changes to past and future timestamps 1361 1362 Casey Station, Antarctica has been using +08 in winter and +11 in 1363 summer since 2018. The most recent transition from +08 to +11 was 1364 2020-10-04 00:01. Also, Macquarie Island has been staying in 1365 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1366 1367 Changes to past and future time zone abbreviations and DST flags 1368 1369 Canada's Yukon, represented by America/Whitehorse and 1370 America/Dawson, changes its time zone rules from -08/-07 to 1371 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1372 This change affects only the time zone abbreviation (MST vs PDT) 1373 and daylight saving flag for the period between the two dates. 1374 (Thanks to Andrew G. Smith.) 1375 1376 Changes to past timestamps 1377 1378 Correct several transitions for Hungary for 1918/1983. 1379 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1380 (Thanks to Géza Nyáry.) Also, the 1890 transition to standard 1381 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1382 1383 The 1891 French transition was on March 16, not March 15. The 1384 1911-03-11 French transition was at midnight, not a minute later. 1385 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1386 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1387 1388 Changes to code 1389 1390 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1391 removed and, with it, so has support for the TYPE field in Rule 1392 lines, which is now reserved for compatibility with earlier zic. 1393 These features were previously deprecated in release 2015f. 1394 (Thanks to Tim Parenti.) 1395 1396 zic now defaults to '-b slim' instead of to '-b fat'. 1397 1398 zic's new '-l -' and '-p -' options uninstall any existing 1399 localtime and posixrules files, respectively. 1400 1401 The undocumented and ineffective tzsetwall function has been 1402 removed. 1403 1404 Changes to build procedure 1405 1406 The Makefile now defaults POSIXRULES to '-', so the posixrules 1407 feature (obsolete as of 2019b) is no longer installed by default. 1408 1409 Changes to documentation and commentary 1410 1411 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1412 been removed from the distribution. (Thanks to Tim Parenti.) 1413 1414 1415Release 2020a - 2020-04-23 16:03:47 -0700 1416 1417 Briefly: 1418 Morocco springs forward on 2020-05-31, not 2020-05-24. 1419 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1420 America/Nuuk renamed from America/Godthab. 1421 zic now supports expiration dates for leap second lists. 1422 1423 Changes to future timestamps 1424 1425 Morocco's second spring-forward transition in 2020 will be May 31, 1426 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1427 Adjust future-year predictions to use the first Sunday after the 1428 day after Ramadan, not the first Sunday after Ramadan. 1429 1430 Canada's Yukon, represented by America/Whitehorse and 1431 America/Dawson, advanced to -07 year-round, beginning with its 1432 spring-forward transition on 2020-03-08, and will not fall back on 1433 2020-11-01. Although a government press release calls this 1434 "permanent Pacific Daylight Saving Time", we prefer MST for 1435 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1436 (Thanks to Tim Parenti.) 1437 1438 Changes to past timestamps 1439 1440 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1441 1442 Changes to timezone identifiers 1443 1444 To reflect current usage in English better, America/Godthab has 1445 been renamed to America/Nuuk. A backwards-compatibility link 1446 remains for the old name. 1447 1448 Changes to code 1449 1450 localtime.c no longer mishandles timestamps after the last 1451 transition in a TZif file with leap seconds and with daylight 1452 saving time transitions projected into the indefinite future. 1453 For example, with TZ='America/Los_Angeles' with leap seconds, 1454 zdump formerly reported a DST transition on 2038-03-14 1455 from 01:59:32.999... to 02:59:33 instead of the correct transition 1456 from 01:59:59.999... to 03:00:00. 1457 1458 zic -L now supports an Expires line in the leapseconds file, and 1459 truncates the TZif output accordingly. This propagates leap 1460 second expiration information into the TZif file, and avoids the 1461 abovementioned localtime.c bug as well as similar bugs present in 1462 many client implementations. If no Expires line is present, zic 1463 -L instead truncates the TZif output based on the #expires comment 1464 present in leapseconds files distributed by tzdb 2018f and later; 1465 however, this usage is obsolescent. For now, the distributed 1466 leapseconds file has an Expires line that is commented out, so 1467 that the file can be fed to older versions of zic which ignore the 1468 commented-out line. Future tzdb distributions are planned to 1469 contain a leapseconds file with an Expires line. 1470 1471 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1472 set to 1 if the system library supports the feature, and 2 if not. 1473 As before, these macros are nonzero if tzcode should support the 1474 feature, zero otherwise. 1475 1476 The configuration macro ALTZONE now has the same values with the 1477 same meaning as HAVE_TZNAME and USG_COMPAT. 1478 1479 The code's defense against CRLF in leap-seconds.list is now 1480 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1481 1482 Although the undocumented tzsetwall function is not changed in 1483 this release, it is now deprecated in preparation for removal in 1484 future releases. Due to POSIX requirements, tzsetwall has not 1485 worked for some time. Any code that uses it should instead use 1486 tzalloc(NULL) or, if portability trumps thread-safety, should 1487 unset the TZ environment variable. 1488 1489 Changes to commentary 1490 1491 The Îles-de-la-Madeleine and the Listuguj reserve are noted as 1492 following America/Halifax, and comments about Yukon's "south" and 1493 "north" have been corrected to say "east" and "west". (Thanks to 1494 Jeffery Nichols.) 1495 1496 1497Release 2019c - 2019-09-11 08:59:48 -0700 1498 1499 Briefly: 1500 Fiji observes DST from 2019-11-10 to 2020-01-12. 1501 Norfolk Island starts observing Australian-style DST. 1502 1503 Changes to future timestamps 1504 1505 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1506 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1507 Adjust future guesses accordingly. 1508 1509 Norfolk Island will observe Australian-style DST starting in 1510 spring 2019. The first transition is on 2019-10-06. (Thanks to 1511 Kyle Czech and Michael Deckers.) 1512 1513 Changes to past timestamps 1514 1515 Many corrections to time in Turkey from 1940 through 1985. 1516 (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.) 1517 1518 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1519 time, not 02:00 DST. (Thanks to Michael Deckers.) 1520 1521 South Korea observed DST from 1948 through 1951. Although this 1522 info was supposed to appear in release 2014j, a typo inadvertently 1523 suppressed the change. (Thanks to Alois Treindl.) 1524 1525 Detroit observed DST in 1967 and 1968 following the US DST rules, 1526 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1527 Alois Treindl for pointing out that the old data entries were 1528 probably wrong.) 1529 1530 Fix several errors in pre-1970 transitions in Perry County, IN. 1531 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1532 1533 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1534 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1535 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02 1536 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1537 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1538 Königsberg switched to +03 on 04-07 not 01-01. 1539 1540 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1541 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1542 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1543 1544 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1545 (Thanks to Michael Deckers.) 1546 1547 Changes to past time zone abbreviations and DST flags 1548 1549 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1550 is now flagged as DST and is abbreviated HKWT not HKT. 1551 1552 Changes to code 1553 1554 leapseconds.awk now relies only on its input data, rather than 1555 also relying on its comments. (Inspired by code from Dennis 1556 Ferguson and Chris Woodbury.) 1557 1558 The code now defends against CRLFs in leap-seconds.list. 1559 (Thanks to Brian Inglis and Chris Woodbury.) 1560 1561 Changes to documentation and commentary 1562 1563 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1564 1565 Nashville's newspapers dueled about the time of day in the 1950s. 1566 (Thanks to John Seigenthaler.) 1567 1568 Liechtenstein observed Swiss DST in 1941/2. 1569 (Thanks to Alois Treindl.) 1570 1571 1572Release 2019b - 2019-07-01 00:09:53 -0700 1573 1574 Briefly: 1575 Brazil no longer observes DST. 1576 'zic -b slim' outputs smaller TZif files; please try it out. 1577 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1578 1579 Changes to future timestamps 1580 1581 Brazil has canceled DST and will stay on standard time indefinitely. 1582 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1583 Oliveira.) 1584 1585 Predictions for Morocco now go through 2087 instead of 2037, to 1586 work around a problem on newlib when using TZif files output by 1587 zic 2019a or earlier. (Problem reported by David Gauchard.) 1588 1589 Changes to past and future timestamps 1590 1591 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1592 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1593 future transitions to be March's last Friday at 00:00. 1594 1595 Changes to past timestamps 1596 1597 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1598 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1599 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1600 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1601 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1602 In 1947 its fall-back transition was on 11-30, not 12-30. 1603 (Thanks to P Chan.) 1604 1605 Changes to past time zone abbreviations 1606 1607 Italy's 1866 transition to Rome Mean Time was on December 12, not 1608 September 22. This affects only the time zone abbreviation for 1609 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1610 Luigi Rosa.) 1611 1612 Changes affecting metadata only 1613 1614 Add info about the Crimea situation in zone1970.tab and zone.tab. 1615 (Problem reported by Serhii Demediuk.) 1616 1617 Changes to code 1618 1619 zic's new -b option supports a way to control data bloat and to 1620 test for year-2038 bugs in software that reads TZif files. 1621 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1622 for example, changing from fat to slim shrinks the Europe/London 1623 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1624 files represent the same set of timestamps and use the same TZif 1625 format as documented in tzfile(5) and in Internet RFC 8536. 1626 Fat format attempts to work around bugs or incompatibilities in 1627 older software, notably software that mishandles 64-bit TZif data 1628 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1629 Slim format is more efficient and does not work around 64-bit bugs 1630 or obsolete TZ strings. Currently zic defaults to fat format 1631 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1632 out-of-the-box default is intended to change in future releases 1633 as the buggy software often mishandles timestamps anyway. 1634 1635 zic no longer treats a set of rules ending in 2037 specially. 1636 Previously, zic assumed that such a ruleset meant that future 1637 timestamps could not be predicted, and therefore omitted a 1638 POSIX-like TZ string in the TZif output. The old behavior is no 1639 longer needed for current tzdata, and caused problems with newlib 1640 when used with older tzdata (reported by David Gauchard). 1641 1642 zic no longer generates some artifact transitions. For example, 1643 Europe/London no longer has a no-op transition in January 1996. 1644 1645 Changes to build procedure 1646 1647 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1648 by a percent or so. 1649 1650 Changes to documentation and commentary 1651 1652 The Makefile now documents the POSIXRULES macro as being obsolete, 1653 and similarly, zic's -p POSIXRULES option is now documented as 1654 being obsolete. Although the POSIXRULES feature still exists and 1655 works as before, in practice it is rarely used for its intended 1656 purpose, and it does not work either in the default reference 1657 implementation (for timestamps after 2037) or in common 1658 implementations such as GNU/Linux (for contemporary timestamps). 1659 Since POSIXRULES was designed primarily as a temporary transition 1660 facility for System V platforms that died off decades ago, it is 1661 being decommissioned rather than institutionalized. 1662 1663 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1664 1665 1666Release 2019a - 2019-03-25 22:01:33 -0700 1667 1668 Briefly: 1669 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1670 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1671 1672 Changes to past and future timestamps 1673 1674 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1675 previously predicted. Adjust our prediction by guessing that spring 1676 transitions will be between 24 and 30 March, which matches recent practice 1677 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1678 1679 Metlakatla ended its observance of Pacific standard time, 1680 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1681 Stanley and Tim Parenti.) 1682 1683 Changes to past timestamps 1684 1685 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1686 (Thanks to Alois Treindl and Isaac Starkman.) 1687 1688 Changes to time zone abbreviations 1689 1690 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1691 of being a separate zone that generates the abbreviation "UCT", 1692 which nowadays is typically a typo. (Problem reported by Isiah 1693 Meadows.) 1694 1695 Changes to code 1696 1697 zic now has an -r option to limit the time range of output data. 1698 For example, 'zic -r @1000000000' limits the output data to 1699 timestamps starting 1000000000 seconds after the Epoch. 1700 This helps shrink output size and can be useful for applications 1701 not needing the full timestamp history, such as TZDIST truncation; 1702 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1703 from Christopher Wong, helped along by bug reports from Wong and 1704 from Tim Parenti.) 1705 1706 Changes to documentation 1707 1708 Mention Internet RFC 8536 (February 2019), which documents TZif. 1709 1710 tz-link.html now cites tzdata-meta 1711 <https://tzdata-meta.timtimeonline.com/>. 1712 1713 1714Release 2018i - 2018-12-30 11:05:43 -0800 1715 1716 Briefly: 1717 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01. 1718 1719 Changes to future timestamps 1720 1721 Due to a change in government, São Tomé and Príncipe switches back 1722 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1723 Nasardinov and Michael Deckers.) 1724 1725 1726Release 2018h - 2018-12-23 17:59:32 -0800 1727 1728 Briefly: 1729 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1730 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1731 Metlakatla, Alaska observes PST this winter only. 1732 Guess Morocco will continue to adjust clocks around Ramadan. 1733 Add predictions for Iran from 2038 through 2090. 1734 1735 Changes to future timestamps 1736 1737 Guess that Morocco will continue to fall back just before and 1738 spring forward just after Ramadan, the practice since 2012. 1739 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1740 negative DST during Ramadan in main and vanguard formats, and in 1741 rearguard format it stays in the +00 timezone and observes 1742 ordinary DST in all months other than Ramadan. As before, extend 1743 this guesswork to the year 2037. As a consequence, Morocco is 1744 scheduled to observe three DST transitions in some Gregorian years 1745 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1746 calendars. 1747 1748 The table of exact transitions for Iranian DST has been extended. 1749 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1750 It now cuts off before 2091 as there is doubt about how the Persian 1751 calendar will treat 2091. This change predicts DST transitions in 1752 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1753 predicted. As before, post-cutoff transitions are approximated. 1754 1755 Changes to past and future timestamps 1756 1757 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1758 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1759 Kostanay) did not switch, so create a zone Asia/Qostanay. 1760 1761 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1762 It did not change clocks that day and remains on -08 this winter. 1763 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1764 rules next spring, so this change affects only timestamps 1765 from 2018-11-04 through 2019-03-10. 1766 1767 Change to past timestamps 1768 1769 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1770 not 00:00. I transcribed the time incorrectly from Shanks. 1771 (Thanks to Phake Nick.) 1772 1773 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1774 (Thanks to Phake Nick.) 1775 1776 Guam observed DST irregularly from 1959 through 1977. 1777 (Thanks to Phake Nick.) 1778 1779 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1780 10-01 changed standard time to +08:30 (not +08). Its transition 1781 back to +08 after WWII was on 1945-09-15, not the previous day. 1782 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1783 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1784 its 1952 fallback was on 11-02 (not 10-25). 1785 1786 This release contains many changes to timestamps before 1946 due 1787 to Japanese possession or occupation of Pacific/Chuuk, 1788 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1789 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1790 (Thanks to Phake Nick.) 1791 1792 Assume that the Spanish East Indies was like the Philippines and 1793 observed American time until the end of 1844. This affects 1794 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1795 1796 Changes to past tm_isdst flags 1797 1798 For the recent Morocco change, the tm_isdst flag should be 1 from 1799 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1800 Give a URL to the official decree. (Thanks to Matt Johnson.) 1801 1802 1803Release 2018g - 2018-10-26 22:22:45 -0700 1804 1805 Briefly: 1806 Morocco switches to permanent +01 on 2018-10-28. 1807 1808 Changes to future timestamps 1809 1810 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1811 so its clocks will not fall back as previously scheduled. 1812 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1813 1814 Changes to code 1815 1816 When generating TZif files with leap seconds, zic no longer uses a 1817 format that trips up older 32-bit clients, fixing a bug introduced 1818 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1819 for QTBUG-53071 now also works for TZif files with leap seconds. 1820 1821 The translator to rearguard format now rewrites the line 1822 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1823 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1824 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1825 and earlier. (Reported by Christos Zoulas.) 1826 1827 Changes to past time zone abbreviations 1828 1829 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1830 This reverts to 2011h, as the abbreviation change in 2011i was 1831 likely inadvertent. 1832 1833 Changes to documentation 1834 1835 tzfile.5 has new sections on interoperability issues. 1836 1837 1838Release 2018f - 2018-10-18 00:14:18 -0700 1839 1840 Briefly: 1841 Volgograd moves from +03 to +04 on 2018-10-28. 1842 Fiji ends DST 2019-01-13, not 2019-01-20. 1843 Most of Chile changes DST dates, effective 2019-04-06. 1844 1845 Changes to future timestamps 1846 1847 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1848 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1849 1850 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1851 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1852 accordingly. 1853 1854 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1855 time, and resume DST on the first Saturday in September at 24:00 mainland 1856 time. The changes are effective from 2019-04-06, and do not affect the 1857 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1858 and Tim Parenti.) Adjust future predictions accordingly. 1859 1860 Changes to past timestamps 1861 1862 The 2018-05-05 North Korea 30-minute time zone change took place 1863 at 23:30 the previous day, not at 00:00 that day. 1864 1865 China's 1988 spring-forward transition was on April 17, not 1866 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1867 (Thanks to P Chan.) 1868 1869 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1870 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1871 temporarily switched to +09/+10 during World War II. Macau 1872 observed DST in 1942/79, not 1961/80, and there were several 1873 errors for transition times and dates. (Thanks to P Chan.) 1874 1875 The 1948-1951 fallback transitions in Japan were at 25:00 on 1876 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1877 zic turns this into 01:00 on the day after September's second 1878 Saturday, which is the best that POSIX or C platforms can do. 1879 1880 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1881 paper by Li Yu, replacing more-questionable data from Shanks. 1882 1883 Changes to time zone abbreviations 1884 1885 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1886 1887 Changes to code 1888 1889 zic now always generates TZif files where time type 0 is used for 1890 timestamps before the first transition. This simplifies the 1891 reading of TZif files and should not affect behavior of existing 1892 TZif readers because the same set of time types is used; only 1893 their internal indexes may have changed. This affects only the 1894 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1895 EET, which previously used nonzero types for these timestamps. 1896 1897 Because of the type 0 change, zic no longer outputs a dummy 1898 transition at time -2**59 (before the Big Bang), as clients should 1899 no longer need this to handle historical timestamps correctly. 1900 This reverts a change introduced in 2013d and shrinks most TZif 1901 files by a few bytes. 1902 1903 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1904 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1905 occurs at 18:00 on the Saturday before the last Sunday in April. 1906 This behavior was documented in 2018a but the code did not 1907 entirely match the documentation. 1908 1909 localtime.c no longer requires at least one time type in TZif 1910 files that lack transitions or have a POSIX-style TZ string. This 1911 future-proofs the code against possible future extensions to the 1912 format that would allow TZif files with POSIX-style TZ strings and 1913 without transitions or time types. 1914 1915 A read-access subscript error in localtime.c has been fixed. 1916 It could occur only in TZif files with timecnt == 0, something that 1917 does not happen in practice now but could happen in future versions. 1918 1919 localtime.c no longer ignores TZif POSIX-style TZ strings that 1920 specify only standard time. Instead, these TZ strings now 1921 override the default time type for timestamps after the last 1922 transition (or for all timestamps if there are no transitions), 1923 just as DST strings specifying DST have always done. 1924 1925 leapseconds.awk now outputs "#updated" and "#expires" comments, 1926 and supports leap seconds at the ends of months other than June 1927 and December. (Inspired by suggestions from Chris Woodbury.) 1928 1929 Changes to documentation 1930 1931 New restrictions: A Rule name must start with a character that 1932 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1933 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1934 The latter restriction makes room for future extensions (a 1935 possibility noted by Tom Lane). 1936 1937 tzfile.5 now documents what time types apply before the first and 1938 after the last transition, if any. 1939 1940 Documentation now uses the spelling "timezone" for a TZ setting 1941 that determines timestamp history, and "time zone" for a 1942 geographic region currently sharing the same standard time. 1943 1944 The name "TZif" is now used for the tz binary data format. 1945 1946 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1947 (Thanks to Aldrin Martoq for the link.) 1948 1949 Changes to build procedure 1950 1951 New 'make' target 'rearguard_tarballs' to build the rearguard 1952 tarball only. This is a convenience on platforms that lack lzip 1953 if you want to build the rearguard tarball. (Problem reported by 1954 Deborah Goldsmith.) 1955 1956 tzdata.zi is now more stable from release to release. (Problem 1957 noted by Tom Lane.) It is also a bit shorter. 1958 1959 tzdata.zi now can contain comment lines documenting configuration 1960 information, such as which data format was selected, which input 1961 files were used, and how leap seconds are treated. (Problems 1962 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1963 are used these comment lines are absent, for backward 1964 compatibility. A redistributor intending to alter its copy of the 1965 files should also append "-LABEL" to the 'version' file's first 1966 line, where "LABEL" identifies the redistributor's change. 1967 1968 1969Release 2018e - 2018-05-01 23:42:51 -0700 1970 1971 Briefly: 1972 1973 North Korea switches back to +09 on 2018-05-05. 1974 The main format uses negative DST again, for Ireland etc. 1975 'make tarballs' now also builds a rearguard tarball. 1976 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1977 1978 Changes to past and future timestamps 1979 1980 North Korea switches back from +0830 to +09 on 2018-05-05. 1981 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1982 and Tim Parenti.) 1983 1984 Bring back the negative-DST changes of 2018a, except be more 1985 compatible with data parsers that do not support negative DST. 1986 Also, this now affects historical timestamps in Namibia and the 1987 former Czechoslovakia, not just Ireland. The main format now uses 1988 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1989 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1990 does not affect UT offsets, only time zone abbreviations and the 1991 tm_isdst flag. Also, this does not affect rearguard or vanguard 1992 formats; effectively the main format now uses vanguard instead of 1993 rearguard format. Data parsers that do not support negative DST 1994 can still use data from the rearguard tarball described below. 1995 1996 Changes to build procedure 1997 1998 The command 'make tarballs' now also builds the tarball 1999 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 2000 except that it uses rearguard format intended for trailing-edge 2001 data parsers. 2002 2003 Changes to data format and to code 2004 2005 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 2006 suffix, which specifies whether the adjusted time is standard time 2007 or daylight saving time. If no suffix is given, daylight saving 2008 time is used if and only if the SAVE column is nonzero; this is 2009 the longstanding behavior. Although this new feature is not used 2010 in tzdata, it could be used to specify the legal time in Namibia 2011 1994-2017, as opposed to the popular time (see below). 2012 2013 Changes to past timestamps 2014 2015 From 1994 through 2017 Namibia observed DST in winter, not summer. 2016 That is, it used negative DST, as Ireland still does. This change 2017 does not affect UTC offsets; it affects only the tm_isdst flag and 2018 the abbreviation used during summer, which is now CAT, not WAST. 2019 Although (as noted by Michael Deckers) summer and winter time were 2020 both simply called "standard time" in Namibian law, in common 2021 practice winter time was considered to be DST (as noted by Stephen 2022 Colebourne). The full effect of this change is only in vanguard 2023 and main format; in rearguard format, the tm_isdst flag is still 2024 zero in winter and nonzero in summer. 2025 2026 In 1946/7 Czechoslovakia also observed negative DST in winter. 2027 The full effect of this change is only in vanguard and main 2028 formats; in rearguard format, it is modeled as plain GMT without 2029 daylight saving. Also, the dates of some 1944/5 DST transitions 2030 in Czechoslovakia have been changed. 2031 2032 2033Release 2018d - 2018-03-22 07:05:46 -0700 2034 2035 Briefly: 2036 2037 Palestine starts DST a week earlier in 2018. 2038 Add support for vanguard and rearguard data consumers. 2039 Add subsecond precision to source data format, though not to data. 2040 2041 Changes to future timestamps 2042 2043 In 2018, Palestine starts DST on March 24, not March 31. 2044 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2045 2046 Changes to past and future timestamps 2047 2048 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2049 at 04:00. (Thanks to Steffen Thorsen.) 2050 2051 Changes to past timestamps 2052 2053 Historical transitions for Uruguay, represented by 2054 America/Montevideo, have been updated per official legal documents, 2055 replacing previous data mainly originating from the inventions of 2056 Shanks & Pottenger. This has resulted in adjustments ranging from 2057 30 to 90 minutes in either direction over at least two dozen 2058 distinct periods ranging from one day to several years in length. 2059 A mere handful of pre-1991 transitions are unaffected; data since 2060 then has come from more reliable contemporaneous reporting. These 2061 changes affect various timestamps in 1920-1923, 1936, 1939, 2062 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2063 Additionally, Uruguay's pre-standard-time UT offset has been 2064 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2065 match the location of the Observatory of the National Meteorological 2066 Institute in Montevideo. 2067 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2068 2069 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2070 (Thanks to Kerry Shetline.) 2071 2072 Fix the 1912-01-01 transition for Portugal and its colonies. 2073 This transition was at 00:00 according to the new UT offset, not 2074 according to the old one. Also assume that Cape Verde switched on 2075 the same date as the rest, not in 1907. This affects 2076 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2077 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2078 (Thanks to Michael Deckers.) 2079 2080 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2081 Turks & Caicos. 2082 2083 Changes to past time zone abbreviations 2084 2085 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2086 is no clock change associated with the transition. 2087 2088 Changes to build procedure 2089 2090 The new DATAFORM macro in the Makefile lets the installer choose 2091 among three source data formats. The idea is to lessen downstream 2092 disruption when data formats are improved. 2093 2094 * DATAFORM=vanguard installs from the latest, bleeding-edge 2095 format. DATAFORM=main (the default) installs from the format 2096 used in the 'africa' etc. files. DATAFORM=rearguard installs 2097 from a trailing-edge format. Eventually, elements of today's 2098 vanguard format should move to the main format, and similarly 2099 the main format's features should eventually move to the 2100 rearguard format. 2101 2102 * In the current version, the main and rearguard formats are 2103 identical and match that of 2018c, so this change does not 2104 affect default behavior. The vanguard format currently contains 2105 one feature not in the main format: negative SAVE values. This 2106 improves support for Ireland, which uses Irish Standard Time 2107 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2108 supported negative SAVE values for decades, and this feature 2109 should move to the main format soon. However, it will not move 2110 to the rearguard format for quite some time because some 2111 downstream parsers do not support it. 2112 2113 * The build procedure constructs three files vanguard.zi, main.zi, 2114 and rearguard.zi, one for each format. Although the files 2115 represent essentially the same data, they may have minor 2116 discrepancies that users are not likely to notice. The files 2117 are intended for downstream data consumers and are not 2118 installed. Zoneinfo parsers that do not support negative SAVE values 2119 should start using rearguard.zi, so that they will be unaffected 2120 when the negative-DST feature moves from vanguard to main. 2121 Bleeding-edge Zoneinfo parsers that support the new features 2122 already can use vanguard.zi; in this respect, current tzcode is 2123 bleeding-edge. 2124 2125 The Makefile should now be safe for parallelized builds, and 'make 2126 -j to2050new.tzs' is now much faster on a multiprocessor host 2127 with GNU Make. 2128 2129 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2130 prepends TZDIR/ to file names that do not begin with '/'. This is 2131 not recommended for general use, due to its security implications. 2132 (From a suggestion by Manuela Friedrich.) 2133 2134 Changes to code 2135 2136 zic now accepts subsecond precision in expressions like 2137 00:19:32.13, which is approximately the legal time of the 2138 Netherlands from 1835 to 1937. However, because it is 2139 questionable whether the few recorded uses of non-integer offsets 2140 had subsecond precision in practice, there are no plans for tzdata 2141 to use this feature. (Thanks to Steve Allen for pointing out 2142 the limitations of historical data in this area.) 2143 2144 The code is a bit more portable to MS-Windows. Installers can 2145 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2146 reserve identifiers like 'localtime'. (Thanks to Manuela 2147 Friedrich.) 2148 2149 Changes to documentation and commentary 2150 2151 theory.html now outlines tzdb's extensions to POSIX's model for 2152 civil time, and has a section "POSIX features no longer needed" 2153 that lists POSIX API components that are now vestigial. 2154 (From suggestions by Steve Summit.) It also better distinguishes 2155 time zones from tz regions. (From a suggestion by Guy Harris.) 2156 2157 Commentary is now more consistent about using the phrase "daylight 2158 saving time", to match the C name tm_isdst. Daylight saving time 2159 need not occur in summer, and need not have a positive offset from 2160 standard time. 2161 2162 Commentary about historical transitions in Uruguay has been expanded 2163 with links to many relevant legal documents. 2164 (Thanks to Tim Parenti.) 2165 2166 Commentary now uses some non-ASCII characters with Unicode value 2167 less than U+0100, as they can be useful and should work even with 2168 older editors such as XEmacs. 2169 2170 2171Release 2018c - 2018-01-22 23:00:44 -0800 2172 2173 Briefly: 2174 Revert Irish changes that relied on negative SAVE values. 2175 2176 Changes to tm_isdst 2177 2178 Revert the 2018a change to Europe/Dublin. As before, this change 2179 does not affect UT offsets or abbreviations; it affects only 2180 whether timestamps are considered to be standard time or 2181 daylight-saving time, as expressed in the tm_isdst flag of C's 2182 struct tm type. This reversion is intended to be a temporary 2183 workaround for problems discovered with downstream uses of 2184 releases 2018a and 2018b, which implemented Irish time by using 2185 negative SAVE values in the Eire rules of the 'europe' file. 2186 Although negative SAVE values have been part of tzcode for many 2187 years and are supported by many platforms, they were not 2188 documented before 2018a and ICU and OpenJDK do not currently 2189 support them. A mechanism to export data to platforms lacking 2190 support for negative DST is planned to be developed before the 2191 change is reapplied. (Problems reported by Deborah Goldsmith and 2192 Stephen Colebourne.) 2193 2194 Changes to past timestamps 2195 2196 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2197 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2198 2199 Changes to build procedure 2200 2201 The build procedure now works around mawk 1.3.3's lack of support 2202 for character class expressions. (Problem reported by Ohyama.) 2203 2204 2205Release 2018b - 2018-01-17 23:24:48 -0800 2206 2207 Briefly: 2208 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2209 2210 Changes to build procedure 2211 2212 The distribution now contains the file 'pacificnew' again. 2213 This file was inadvertently omitted in the 2018a distribution. 2214 (Problem reported by Matias Fonzo.) 2215 2216 2217Release 2018a - 2018-01-12 22:29:21 -0800 2218 2219 Briefly: 2220 São Tomé and Príncipe switched from +00 to +01. 2221 Brazil's DST will now start on November's first Sunday. 2222 Ireland's standard time is now in the summer, not the winter. 2223 Use Debian-style installation locations, instead of 4.3BSD-style. 2224 New zic option -t. 2225 2226 Changes to past and future timestamps 2227 2228 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at 2229 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2230 2231 Changes to future timestamps 2232 2233 Starting in 2018 southern Brazil will begin DST on November's 2234 first Sunday instead of October's third Sunday. (Thanks to 2235 Steffen Thorsen.) 2236 2237 Changes to past timestamps 2238 2239 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2240 been corrected. The 'backzone' and 'zone.tab' files did not agree 2241 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2242 Michael Deckers.) 2243 2244 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2245 BST instead of BOST, to be more consistent with the convention 2246 used for Latvian Summer Time (1918-9) and for British Summer Time. 2247 2248 Changes to tm_isdst 2249 2250 Change Europe/Dublin so that it observes Irish Standard Time (UT 2251 +01) in summer and GMT (as negative daylight-saving) in winter, 2252 instead of observing standard time (GMT) in winter and Irish 2253 Summer Time (UT +01) in summer. This change does not affect UT 2254 offsets or abbreviations; it affects only whether timestamps are 2255 considered to be standard time or daylight-saving time, as 2256 expressed in the tm_isdst flag of C's struct tm type. 2257 (Discrepancy noted by Derick Rethans.) 2258 2259 Changes to build procedure 2260 2261 The default installation locations have been changed to mostly 2262 match Debian circa 2017, instead of being designed as an add-on to 2263 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2264 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2265 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2266 locations more precisely. (This responds to suggestions from 2267 Brian Inglis and from Steve Summit.) 2268 2269 The default installation procedure no longer creates the 2270 backward-compatibility link US/Pacific-New, which causes 2271 confusion during user setup (e.g., see Debian bug 815200). 2272 Use 'make BACKWARD="backward pacificnew"' to create the link 2273 anyway, for now. Eventually we plan to remove the link entirely. 2274 2275 tzdata.zi now contains a version-number comment. 2276 (Suggested by Tom Lane.) 2277 2278 The Makefile now quotes values like BACKWARD more carefully when 2279 passing them to the shell. (Problem reported by Zefram.) 2280 2281 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2282 that have snprintf and use pre-C99 compilers. (Problem reported 2283 by Jon Skeet.) 2284 2285 Changes to code 2286 2287 zic has a new option -t FILE that specifies the location of the 2288 file that determines local time when TZ is unset. The default for 2289 this location can be configured via the new TZDEFAULT makefile 2290 macro, which defaults to /etc/localtime. 2291 2292 Diagnostics and commentary now distinguish UT from UTC more 2293 carefully; see theory.html for more information about UT vs UTC. 2294 2295 zic has been ported to GCC 8's -Wstringop-truncation option. 2296 (Problem reported by Martin Sebor.) 2297 2298 Changes to documentation and commentary 2299 2300 The zic man page now documents the longstanding behavior that 2301 times and years can be out of the usual range, with negative times 2302 counting backwards from midnight and with year 0 preceding year 1. 2303 (Problem reported by Michael Deckers.) 2304 2305 The theory.html file now mentions the POSIX limit of six chars 2306 per abbreviation, and lists alphabetic abbreviations used. 2307 2308 The files tz-art.htm and tz-link.htm have been renamed to 2309 tz-art.html and tz-link.html, respectively, for consistency with 2310 other file names and to simplify web server configuration. 2311 2312 2313Release 2017c - 2017-10-20 14:49:34 -0700 2314 2315 Briefly: 2316 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2317 Fiji ends DST 2018-01-14, not 2018-01-21. 2318 Namibia switches from +01/+02 to +02 on 2018-04-01. 2319 Sudan switches from +03 to +02 on 2017-11-01. 2320 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2321 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2322 A new file tzdata.zi now holds a small text copy of all data. 2323 The zic input format has been regularized slightly. 2324 2325 Changes to future timestamps 2326 2327 Northern Cyprus has decided to resume EU rules starting 2328 2017-10-29, thus reinstituting winter time. 2329 2330 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2331 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2332 accordingly. 2333 2334 Namibia will switch from +01 with DST to +02 all year on 2335 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2336 at 02:00. (Thanks to Steffen Thorsen.) 2337 2338 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2339 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2340 Africa/Juba is no longer a link to Africa/Khartoum. 2341 2342 Tonga has likely ended its experiment with DST, and will not 2343 adjust its clocks on 2017-11-05. Although Tonga has not announced 2344 whether it will continue to observe DST, the IATA is assuming that 2345 it will not. (Thanks to David Wade.) 2346 2347 Turks & Caicos will switch from -04 all year to -05 with US DST on 2348 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2349 at 02:00. (Thanks to Steffen Thorsen.) 2350 2351 Changes to past timestamps 2352 2353 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2354 (Thanks to Arthur David Olson.) 2355 2356 Detroit did not observe DST in 1967. 2357 2358 Use railway time for Asia/Kolkata before 1941, by switching to 2359 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2360 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2361 2362 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2363 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2364 2365 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2366 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2367 2368 Adjust the 1867 transition in Alaska to better reflect the 2369 historical record, by changing it to occur on 1867-10-18 at 15:30 2370 Sitka time rather than at the start of 1867-10-17 local time. 2371 Although strictly speaking this is accurate only for Sitka, 2372 the rest of Alaska's blanks need to be filled in somehow. 2373 2374 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2375 (Thanks to Michael Deckers.) 2376 2377 Add 7 s to the UT offset in Asia/Yangon before 1920. 2378 2379 Changes to zone names 2380 2381 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2382 exceeded the 14-character limit and was an unused misnomer anyway. 2383 2384 Changes to build procedure 2385 2386 To support applications that prefer to read time zone data in text 2387 form, two zic input files tzdata.zi and leapseconds are now 2388 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2389 leapseconds tzdata.zi' can reproduce the tzdata binary files 2390 without and with leap seconds, respectively. To prevent these two 2391 new files from being installed, use 'make TZDATA_TEXT=', and to 2392 suppress leap seconds from the tzdata text installation, use 'make 2393 TZDATA_TEXT=tzdata.zi'. 2394 2395 'make BACKWARD=' now suppresses backward-compatibility names 2396 like 'US/Pacific' that are defined in the 'backward' and 2397 'pacificnew' files. 2398 2399 'make check' now works on systems that lack a UTF-8 locale, 2400 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2401 the name of a UTF-8 locale, if you have one. 2402 2403 Y2K runtime checks are no longer enabled by default. Add 2404 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2405 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2406 to disable them. (New name suggested by Brian Inglis.) 2407 2408 The build procedure for zdump now works on AIX 7.1. 2409 (Problem reported by Kees Dekker.) 2410 2411 Changes to code 2412 2413 zic and the reference runtime now reject multiple leap seconds 2414 within 28 days of each other, or leap seconds before the Epoch. 2415 As a result, support for double leap seconds, which was 2416 obsolescent and undocumented, has been removed. Double leap 2417 seconds were an error in the C89 standard; they have never existed 2418 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2419 noticing glitches in the code that uncovered this problem.) 2420 2421 zic now warns about use of the obsolescent and undocumented -y 2422 option, and about use of the obsolescent TYPE field of Rule lines. 2423 2424 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2425 weekdays; formerly it rejected them due to a bug. Conversely, zic 2426 no longer considers non-prefixes to be abbreviations; for example, 2427 it no longer accepts "lF" as an abbreviation for "lastFriday". 2428 Also, zic warns about the undocumented usage with a "last-" 2429 prefix, e.g., "last-Fri". 2430 2431 Similarly, zic now accepts the unambiguous abbreviation "L" for 2432 "Link" in ordinary context and for "Leap" in leap-second context. 2433 Conversely, zic no longer accepts non-prefixes such as "La" as 2434 abbreviations for words like "Leap". 2435 2436 zic no longer accepts leap second lines in ordinary input, or 2437 ordinary lines in leap second input. Formerly, zic sometimes 2438 warned about this undocumented usage and handled it incorrectly. 2439 2440 The new macro HAVE_TZNAME governs whether the tzname external 2441 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2442 governs only the external variables "timezone" and "daylight". 2443 This change is needed because the three variables are not in the 2444 same category: although POSIX requires tzname, it specifies the 2445 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2446 if not defined, the code attempts to guess it from other macros. 2447 2448 localtime.c and difftime.c no longer require stdio.h, and .c files 2449 other than zic.c no longer require sys/wait.h. 2450 2451 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2452 2453 Calculation of time_t extrema works around a bug in GCC 4.8.4 2454 (Reported by Stan Shebs and Joseph Myers.) 2455 2456 zic.c no longer mistranslates formats of line numbers in non-English 2457 locales. (Problem reported by Benno Schulenberg.) 2458 2459 Several minor changes have been made to the code to make it a 2460 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2461 Dekker for reporting the problems.) 2462 2463 Changes to documentation and commentary 2464 2465 The two new files 'theory.html' and 'calendars' contain the 2466 contents of the removed file 'Theory'. The goal is to document 2467 tzdb theory more accessibly. 2468 2469 The zic man page now documents abbreviation rules. 2470 2471 tz-link.htm now covers how to apply tzdata changes to clients. 2472 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL. 2473 2474 The leap-seconds.list URL has been updated to something that is 2475 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2476 2477Release 2017b - 2017-03-17 07:30:38 -0700 2478 2479 Briefly: Haiti has resumed DST. 2480 2481 Changes to past and future timestamps 2482 2483 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2484 2485 Changes to past timestamps 2486 2487 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2488 2489 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2490 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2491 2492 Changes to code 2493 2494 The reference localtime implementation now falls back on the 2495 current US daylight-saving transition rules rather than the 2496 1987-2006 rules. This fallback occurs only when (1) the TZ 2497 environment variable has a value like "AST4ADT" that asks 2498 for daylight saving time but does not specify the rules, (2) there 2499 is no file by that name, and (3) the TZDEFRULES file cannot be 2500 loaded. (Thanks to Tom Lane.) 2501 2502 2503Release 2017a - 2017-02-28 00:05:36 -0800 2504 2505 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2506 discontinues DST. 2507 2508 Changes to future timestamps 2509 2510 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2511 2512 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2513 Its clocks diverge from America/Santiago starting 2017-05-13 at 2514 23:00, hiving off a new zone America/Punta_Arenas. Although the 2515 Chilean government says this change expires in May 2019, for now 2516 assume it's permanent. (Thanks to Juan Correa and Deborah 2517 Goldsmith.) This also affects Antarctica/Palmer. 2518 2519 Changes to past timestamps 2520 2521 Fix many entries for historical timestamps for Europe/Madrid 2522 before 1979, to agree with tables compiled by Pere Planesas of the 2523 National Astronomical Observatory of Spain. As a side effect, 2524 this changes some timestamps for Africa/Ceuta before 1929, which 2525 are probably guesswork anyway. (Thanks to Steve Allen and 2526 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2527 correcting the 1901 transition.) 2528 2529 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2530 (Thanks to Alois Treindl.) 2531 2532 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2533 (Thanks to Stepan Golosunov.) 2534 2535 Changes to past and future time zone abbreviations 2536 2537 Switch to numeric time zone abbreviations for South America, as 2538 part of the ongoing project of removing invented abbreviations. 2539 This avoids the need to invent an abbreviation for the new Chilean 2540 new zone. Similarly, switch from invented to numeric time zone 2541 abbreviations for Afghanistan, American Samoa, the Azores, 2542 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2543 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2544 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2545 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2546 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2547 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2548 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St 2549 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2550 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2551 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2552 for half-hour daylight saving time in Belize before 1944 and in 2553 the Dominican Republic before 1975; and for Canary Islands before 2554 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2555 Indian Summer Time before 1942, for Indonesia before around 1964, 2556 for Kenya before 1960, for Liberia before 1973, for Madeira before 2557 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2558 Pakistan before 1971, for Western Sahara before 1977, and for 2559 Zaporozhye in 1880-1924. 2560 2561 For Alaska time from 1900 through 1967, instead of "CAT" use the 2562 abbreviation "AST", the abbreviation commonly used at the time 2563 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2564 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2565 2566 Use "CST" and "CDT" instead of invented abbreviations for Macau 2567 before 1999 and Taiwan before 1938, and use "JST" instead of the 2568 invented abbreviation "JCST" for Japan and Korea before 1938. 2569 2570 Change to database entry category 2571 2572 Move the Pacific/Johnston link from 'australasia' to 'backward', 2573 since Johnston is now uninhabited. 2574 2575 Changes to code 2576 2577 zic no longer mishandles some transitions in January 2038 when it 2578 attempts to work around Qt bug 53071. This fixes a bug affecting 2579 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2580 now contains a workaround, useful when loading a file generated by 2581 a buggy zic. (Problem and localtime.c fix reported by Bradley 2582 White.) 2583 2584 zdump -i now outputs non-hour numeric time zone abbreviations 2585 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2586 with zic %z and with common practice, and simplifies auditing of 2587 zdump output. 2588 2589 zdump is now buildable again with -DUSE_LTZ=0. 2590 (Problem reported by Joseph Myers.) 2591 2592 zdump.c now always includes private.h, to avoid code duplication 2593 with private.h. (Problem reported by Kees Dekker.) 2594 2595 localtime.c no longer mishandles early or late timestamps 2596 when TZ is set to a POSIX-style string that specifies DST. 2597 (Problem reported by Kees Dekker.) 2598 2599 date and strftime now cause %z to generate "-0000" instead of 2600 "+0000" when the UT offset is zero and the time zone abbreviation 2601 begins with "-". 2602 2603 Changes to documentation and commentary 2604 2605 The 'Theory' file now better documents choice of historical time 2606 zone abbreviations. (Problems reported by Michael Deckers.) 2607 2608 tz-link.htm now covers leap smearing, which is popular in clouds. 2609 2610 2611Release 2016j - 2016-11-22 23:17:13 -0800 2612 2613 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2614 2615 Changes to future timestamps 2616 2617 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2618 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2619 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2620 2621 Changes to past timestamps 2622 2623 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like 2624 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2625 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2626 2627 Changes to past time zone abbreviations 2628 2629 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2630 summer time before 1948. The old use of "EET" was a typo. 2631 2632 Changes to code 2633 2634 zic no longer mishandles file systems that lack hard links, fixing 2635 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2636 Also, when the destination already contains symbolic links, zic 2637 should now work better on systems where the 'link' system call 2638 does not follow symbolic links. 2639 2640 Changes to documentation and commentary 2641 2642 tz-link.htm now documents the relationship between release version 2643 numbers and development-repository commit tags. (Suggested by 2644 Paul Koning.) 2645 2646 The 'Theory' file now documents UT. 2647 2648 iso3166.tab now accents "Curaçao", and commentary now mentions 2649 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.) 2650 2651 2652Release 2016i - 2016-11-01 23:19:52 -0700 2653 2654 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2655 reintroduces DST on 2016-11-06. 2656 2657 Changes to future timestamps 2658 2659 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2660 2017-01-15 at 03:00. Assume future observances in Tonga will be 2661 from the first Sunday in November through the third Sunday in 2662 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric 2663 time zone abbreviations for this zone. 2664 2665 Changes to past and future timestamps 2666 2667 Northern Cyprus is now +03 year round, causing a split in Cyprus 2668 time zones starting 2016-10-30 at 04:00. This creates a zone 2669 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2670 2671 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2672 (Thanks to Steffen Thorsen.) 2673 2674 Changes to past timestamps 2675 2676 Several corrections were made for pre-1975 timestamps in Italy. 2677 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2678 Europe/Vatican. 2679 2680 First, the 1893-11-01 00:00 transition in Italy used the new UT 2681 offset (+01), not the old (+00:49:56). (Thanks to Michael 2682 Deckers.) 2683 2684 Second, rules for daylight saving in Italy were changed to agree 2685 with Italy's National Institute of Metrological Research (INRiM) 2686 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2687 Inglis, and Michael Deckers): 2688 2689 The 1916-06-03 transition was at 24:00, not 00:00. 2690 2691 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2692 00:00, not 01:00. 2693 2694 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2695 01:00. 2696 2697 The 1944-09-17 transition was at 03:00, not 01:00. This 2698 particular change is taken from Italian law as INRiM's table, 2699 (which says 02:00) appears to have a typo here. Also, keep the 2700 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2701 Germany then. 2702 2703 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2704 not 00:00. 2705 2706 Changes to code 2707 2708 The code should now be buildable on AmigaOS merely by setting the 2709 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2710 2711 2712Release 2016h - 2016-10-19 23:17:57 -0700 2713 2714 Changes to future timestamps 2715 2716 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2717 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2718 future fall transitions will be on the last Saturday of October 2719 at 01:00, which is consistent with predicted spring transitions 2720 on the last Saturday of March. (Thanks to Tim Parenti.) 2721 2722 Changes to past timestamps 2723 2724 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2725 not at 02:00, and the spring 1994 transition was on March 20, not 2726 March 27. (Thanks to Kıvanç Yazan.) 2727 2728 Changes to past and future time zone abbreviations 2729 2730 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2731 instead of alphabetic ones like "IST" and "LKT". Various 2732 English-language sources use "IST", "LKT" and "SLST", with no 2733 working consensus. (Usage of "SLST" mentioned by Sadika 2734 Sumanapala.) 2735 2736 Changes to code 2737 2738 zic no longer mishandles relativizing file names when creating 2739 symbolic links like /etc/localtime, when these symbolic links 2740 are outside the usual directory hierarchy. This fixes a bug 2741 introduced in 2016g. (Problem reported by Andreas Stieger.) 2742 2743 Changes to build procedure 2744 2745 New rules 'traditional_tarballs' and 'traditional_signatures' for 2746 building just the traditional-format distribution. (Requested by 2747 Deborah Goldsmith.) 2748 2749 The file 'version' is now put into the tzdata tarball too. 2750 (Requested by Howard Hinnant.) 2751 2752 Changes to documentation and commentary 2753 2754 The 'Theory' file now has a section on interface stability. 2755 (Requested by Paul Koning.) It also mentions features like 2756 tm_zone and localtime_rz that have long been supported by the 2757 reference code. 2758 2759 tz-link.htm has improved coverage of time zone boundaries suitable 2760 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2761 Johnson.) 2762 2763 The US commentary now mentions Allen and the "day of two noons". 2764 2765 The Fiji commentary mentions the government's 2016-10-03 press 2766 release. (Thanks to Raymond Kumar.) 2767 2768 2769Release 2016g - 2016-09-13 08:56:38 -0700 2770 2771 Changes to future timestamps 2772 2773 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2774 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2775 than an invented abbreviation for the new time. 2776 2777 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2778 (Thanks to Tim Parenti.) 2779 2780 Changes to past timestamps 2781 2782 For America/Los_Angeles, spring-forward transition times have been 2783 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2784 1950-1966. 2785 2786 For zones using Soviet time on 1919-07-01, transitions to UT-based 2787 time were at 00:00 UT, not at 02:00 local time. The affected 2788 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2789 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2790 2791 Changes to past and future time zone abbreviations 2792 2793 The Factory zone now uses the time zone abbreviation -00 instead 2794 of a long English-language string, as -00 is now the normal way to 2795 represent an undefined time zone. 2796 2797 Several zones in Antarctica and the former Soviet Union, along 2798 with zones intended for ships at sea that cannot use POSIX TZ 2799 strings, now use numeric time zone abbreviations instead of 2800 invented or obsolete alphanumeric abbreviations. The affected 2801 zones are Antarctica/Casey, Antarctica/Davis, 2802 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2803 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2804 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2805 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2806 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2807 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2808 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2809 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2810 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2811 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2812 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2813 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2814 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2815 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2816 was replaced by +05, whereas MSK and MSD were kept as they are not 2817 our invention and are widely used. 2818 2819 Changes to zone names 2820 2821 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2822 (Thanks to David Massoud.) 2823 2824 Changes to code 2825 2826 zic no longer generates binary files containing POSIX TZ-like 2827 strings that disagree with the local time type after the last 2828 explicit transition in the data. This fixes a bug with 2829 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2830 on the reference platform. (Thanks to Alexander Belopolsky for 2831 reporting the bug and suggesting a way forward.) 2832 2833 If the installed localtime and/or posixrules files are symbolic 2834 links, zic now keeps them symbolic links when updating them, for 2835 compatibility with platforms like OpenSUSE where other programs 2836 configure these files as symlinks. 2837 2838 zic now avoids hard linking to symbolic links, avoids some 2839 unnecessary mkdir and stat system calls, and uses shorter file 2840 names internally. 2841 2842 zdump has a new -i option to generate transitions in a 2843 smaller but still human-readable format. This option is 2844 experimental, and the output format may change in future versions. 2845 (Thanks to Jon Skeet for suggesting that an option was needed, 2846 and thanks to Tim Parenti and Chris Rovick for further comments.) 2847 2848 Changes to build procedure 2849 2850 An experimental distribution format is available, in addition 2851 to the traditional format which will continue to be distributed. 2852 The new format is a tarball tzdb-VERSION.tar.lz with signature 2853 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2854 tzdb-VERSION containing the code and data of the traditional 2855 two-tarball format, along with extra data that may be useful. 2856 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2857 for comments about the experimental format.) 2858 2859 The release version number is now more accurate in the usual case 2860 where releases are built from a Git repository. For example, if 2861 23 commits and some working-file changes have been made since 2862 release 2016g, the version number is now something like 2863 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2864 Tagged releases use the same version number format as before, 2865 e.g., '2016g'. To support the more accurate version number, its 2866 specification has moved from a line in the Makefile to a new 2867 source file 'version'. 2868 2869 The experimental distribution contains a file to2050.tzs that 2870 contains what should be the output of 'zdump -i -c 2050' on 2871 primary zones. If this file is available, 'make check' now checks 2872 that zdump generates this output. 2873 2874 'make check_web' now works on Fedora-like distributions. 2875 2876 Changes to documentation and commentary 2877 2878 tzfile.5 now documents the new restriction on POSIX TZ-like 2879 strings that is now implemented by zic. 2880 2881 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2882 (Thanks to Alexander Belopolsky.) 2883 2884 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2885 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2886 description of Java 8 has been brought up to date (thanks to 2887 Stephen Colebourne). Its description of local time on Mars has 2888 been updated to match current practice, and URLs have been updated 2889 and some obsolete ones removed. 2890 2891 2892Release 2016f - 2016-07-05 16:26:51 +0200 2893 2894 Changes affecting future timestamps 2895 2896 The Egyptian government changed its mind on short notice, and 2897 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2898 (Thanks to Mina Samuel.) 2899 2900 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2901 (Thanks to Stepan Golosunov.) 2902 2903 Changes to past and future timestamps 2904 2905 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2906 abbreviations instead of invented ones. 2907 2908 Changes affecting past timestamps 2909 2910 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2911 (Thanks to Stepan Golosunov.) 2912 2913 2914Release 2016e - 2016-06-14 08:46:16 -0700 2915 2916 Changes affecting future timestamps 2917 2918 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2919 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2920 For future years, guess April's last Thursday to October's last 2921 Thursday except for Ramadan. 2922 2923 Changes affecting past timestamps 2924 2925 Locations while uninhabited now use '-00', not 'zzz', as a 2926 placeholder time zone abbreviation. This is inspired by Internet 2927 RFC 3339 and is more consistent with numeric time zone 2928 abbreviations already used elsewhere. The change affects several 2929 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2930 1920 and Antarctica/Troll before 2005. 2931 2932 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2933 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2934 2935 Changes to code 2936 2937 zic now outputs a dummy transition at time 2**31 - 1 in zones 2938 whose POSIX-style TZ strings contain a '<'. This mostly works 2939 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2940 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2941 2942 Changes affecting documentation and commentary 2943 2944 tz-link.htm says why governments should give plenty of notice for 2945 time zone or DST changes, and refers to Matt Johnson's blog post. 2946 2947 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2948 2949 2950Release 2016d - 2016-04-17 22:50:29 -0700 2951 2952 Changes affecting future timestamps 2953 2954 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2955 (Thanks to Alexander Krivenyshev for the heads-up.) 2956 2957 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2958 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2959 2960 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2961 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2962 at 02:00. (Thanks to Stepan Golosunov.) 2963 2964 Changes affecting past timestamps 2965 2966 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2967 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2968 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2969 the same change. (Thanks to Stepan Golosunov.) 2970 2971 Russia and nearby locations had daylight-saving transitions on 2972 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2973 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2974 Golosunov.) 2975 2976 Many corrections to historical time in Kazakhstan from 1991 2977 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2978 invented time zone abbreviations with numeric abbreviations. 2979 2980 Changes to commentary 2981 2982 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2983 2984 2985Release 2016c - 2016-03-23 00:51:27 -0700 2986 2987 Changes affecting future timestamps 2988 2989 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2990 2991 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2992 Correa for the heads-up, and to Tim Parenti for corrections.) 2993 Guess that future transitions are August's and May's second 2994 Saturdays at 24:00 mainland time. Also, call the period from 2995 2014-09-07 through 2016-05-14 daylight saving time instead of 2996 standard time, as that seems more appropriate now. 2997 2998 Changes affecting past timestamps 2999 3000 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 3001 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 3002 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 3003 (Thanks to Stepan Golosunov.) 3004 3005 Changes to commentary 3006 3007 Several updates and URLs for historical and proposed Russian changes. 3008 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 3009 3010 3011Release 2016b - 2016-03-12 17:30:14 -0800 3012 3013 Compatibility note 3014 3015 Starting with release 2016b, some data entries cause zic implementations 3016 derived from tz releases 2005j through 2015e to issue warnings like 3017 "time zone abbreviation differs from POSIX standard (+03)". 3018 These warnings should not otherwise affect zic's output and can safely be 3019 ignored on today's platforms, as the warnings refer to a restriction in 3020 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 3021 warnings is to upgrade to zic derived from tz releases 2015f and later. 3022 3023 Changes affecting future timestamps 3024 3025 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 3026 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 3027 2016-03-27 at 02:00 local time. They need distinct zones since their 3028 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 3029 Altai Republic, Russia, which will switch from +06 to +07 on the same date 3030 and local time. The Astrakhan change is already official; the others have 3031 passed the first reading in the State Duma and are extremely likely. 3032 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 3033 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 3034 and Stepan Golosunov for followup.) 3035 3036 As a trial of a new system that needs less information to be made up, 3037 the new zones use numeric time zone abbreviations like "+04" 3038 instead of invented abbreviations like "ASTT". 3039 3040 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3041 Steffen Thorsen.) 3042 3043 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3044 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3045 Saturday at 01:00, not March's last Friday at 24:00. 3046 3047 Changes affecting past timestamps 3048 3049 Europe/Chisinau observed DST during 1990, and switched from +04 to 3050 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3051 (Thanks to Stepan Golosunov.) 3052 3053 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3054 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3055 3056 Changes to code 3057 3058 tzselect's diagnostics and checking, and checktab.awk's checking, 3059 have been improved. (Thanks to J William Piggott.) 3060 3061 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3062 3063 tzselect now tests Julian-date TZ settings more accurately. 3064 (Thanks to J William Piggott.) 3065 3066 Changes to commentary 3067 3068 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3069 3070 tzselect again limits its menu comments so that menus fit on a 3071 24×80 alphanumeric display. 3072 3073 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3074 3075 In the Theory file, the description of possible time zone abbreviations in 3076 tzdata has been cleaned up, as the old description was unclear and 3077 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3078 3079 3080Release 2016a - 2016-01-26 23:28:02 -0800 3081 3082 Changes affecting future timestamps 3083 3084 America/Cayman will not observe daylight saving this year after all. 3085 Revert our guess that it would. (Thanks to Matt Johnson.) 3086 3087 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3088 (Thanks to Alexander Krivenyshev.) 3089 3090 Asia/Tehran now has DST predictions for the year 2038 and later, 3091 to be March 21 00:00 to September 21 00:00. This is likely better 3092 than predicting no DST, albeit off by a day every now and then. 3093 3094 Changes affecting past and future timestamps 3095 3096 America/Metlakatla switched from PST all year to AKST/AKDT on 3097 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3098 3099 America/Santa_Isabel has been removed, and replaced with a 3100 backward compatibility link to America/Tijuana. Its contents were 3101 apparently based on a misreading of Mexican legislation. 3102 3103 Changes affecting past timestamps 3104 3105 Asia/Karachi's two transition times in 2002 were off by a minute. 3106 (Thanks to Matt Johnson.) 3107 3108 Changes affecting build procedure 3109 3110 An installer can now combine leap seconds with use of the backzone file, 3111 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3112 The old 'make posix_packrat' rule is now marked as obsolescent. 3113 (Thanks to Ian Abbott for an initial implementation.) 3114 3115 Changes affecting documentation and commentary 3116 3117 A new file LICENSE makes it easier to see that the code and data 3118 are mostly public-domain. (Thanks to James Knight.) The three 3119 non-public-domain files now use the current (3-clause) BSD license 3120 instead of older versions of that license. 3121 3122 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3123 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3124 on editing tz source files (with a mention of Sublime zoneinfo, 3125 thanks to Gilmore Davidson). 3126 3127 The Theory and asia files now mention the 2015 book "The Global 3128 Transformation of Time, 1870-1950", and cite a couple of reviews. 3129 3130 The America/Chicago entry now documents the informal use of US 3131 central time in Fort Pierre, South Dakota. (Thanks to Rick 3132 McDermid, Matt Johnson, and Steve Jones.) 3133 3134 3135Release 2015g - 2015-10-01 00:39:51 -0700 3136 3137 Changes affecting future timestamps 3138 3139 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3140 (Thanks to Fatih.) 3141 3142 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3143 (Thanks to Alexander Krivenyshev.) 3144 3145 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3146 (Thanks to Ken Rylander.) 3147 3148 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3149 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3150 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3151 3152 Changes affecting past timestamps 3153 3154 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3155 3156 Changes affecting code 3157 3158 localtime no longer mishandles America/Anchorage after 2037. 3159 (Thanks to Bradley White for reporting the bug.) 3160 3161 On hosts with signed 32-bit time_t, localtime no longer mishandles 3162 Pacific/Fiji after 2038-01-16 14:00 UTC. 3163 3164 The localtime module allows the variables 'timezone', 'daylight', 3165 and 'altzone' to be in common storage shared with other modules, 3166 and declares them in case the system <time.h> does not. 3167 (Problems reported by Kees Dekker.) 3168 3169 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3170 This simplifies the code and is consistent with zdump.c. 3171 (Problem reported by Christos Zoulas.) 3172 3173 Changes affecting documentation 3174 3175 The tzfile man page now documents that transition times denote the 3176 starts (not the ends) of the corresponding time periods. 3177 (Ambiguity reported by Bill Seymour.) 3178 3179 3180Release 2015f - 2015-08-10 18:06:56 -0700 3181 3182 Changes affecting future timestamps 3183 3184 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3185 The abbreviation remains "KST". (Thanks to Robert Elz.) 3186 3187 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3188 and Pablo Camargo.) 3189 3190 Changes affecting past and future timestamps 3191 3192 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3193 (Thanks to Roman Tudos.) 3194 3195 Changes affecting data format and code 3196 3197 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3198 field of a Rule line should now be '-'; the old values 'even', 3199 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3200 Although the implementation has not changed, these features do not 3201 work in the default installation, they are not used in the data, 3202 and they are now considered obsolescent. 3203 3204 zic now checks that two rules don't take effect at the same time. 3205 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3206 simultaneity are now documented. 3207 3208 The two characters '%z' in a zone format now stand for the UT 3209 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3210 five hours and thirty minutes ahead. This better supports time 3211 zone abbreviations conforming to POSIX.1-2001 and later. 3212 3213 Changes affecting installed data files 3214 3215 Comments for America/Halifax and America/Glace_Bay have been improved. 3216 (Thanks to Brian Inglis.) 3217 3218 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3219 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3220 installed data files for Europe/Simferopol and Europe/Tallinn. 3221 It does not affect timestamps. (Thanks to Howard Hinnant.) 3222 3223 Changes affecting code 3224 3225 zdump and zic no longer warn about valid time zone abbreviations 3226 like '-05'. 3227 3228 Some Visual Studio 2013 warnings have been suppressed. 3229 (Thanks to Kees Dekker.) 3230 3231 'date' no longer sets the time of day and its -a, -d, -n and -t 3232 options have been removed. Long obsolescent, the implementation 3233 of these features had porting problems. Builders no longer need 3234 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3235 (Thanks to Kees Dekker for pointing out the problem.) 3236 3237 Changes affecting documentation 3238 3239 The Theory file mentions naming issues earlier, as these seem to be 3240 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3241 3242 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3243 3244 Mention that Herbert Samuel introduced the term "Summer Time". 3245 3246 3247Release 2015e - 2015-06-13 10:56:02 -0700 3248 3249 Changes affecting future timestamps 3250 3251 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3252 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3253 3254 Assume Cayman Islands will observe DST starting next year, using US rules. 3255 Although it isn't guaranteed, it is the most likely. 3256 3257 Changes affecting data format 3258 3259 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3260 spell the names of Åland Islands, Côte d'Ivoire, and Réunion. 3261 3262 Changes affecting code 3263 3264 When displaying data, tzselect converts it to the current locale's 3265 encoding if the iconv command works. (Problem reported by random832.) 3266 3267 tzselect no longer mishandles Dominica, fixing a bug introduced 3268 in Release 2014f. (Problem reported by Owen Leibman.) 3269 3270 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3271 This fixes a bug introduced in Release 2014f. 3272 (Problem reported by Leonardo Chiquitto.) 3273 3274 3275Release 2015d - 2015-04-24 08:09:46 -0700 3276 3277 Changes affecting future timestamps 3278 3279 Egypt will not observe DST in 2015 and will consider canceling it 3280 permanently. For now, assume no DST indefinitely. 3281 (Thanks to Ahmed Nazmy and Tim Parenti.) 3282 3283 Changes affecting past timestamps 3284 3285 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3286 1966-07-01. Also, Yukon's time zone history is documented better. 3287 (Thanks to Brian Inglis and Dennis Ferguson.) 3288 3289 Change affecting past and future time zone abbreviations 3290 3291 The abbreviations for Hawaii-Aleutian standard and daylight times 3292 have been changed from HAST/HADT to HST/HDT, as per US Government 3293 Printing Office style. This affects only America/Adak since 1983, 3294 as America/Honolulu was already using the new style. 3295 3296 Changes affecting code 3297 3298 zic has some minor performance improvements. 3299 3300 3301Release 2015c - 2015-04-11 08:55:55 -0700 3302 3303 Changes affecting future timestamps 3304 3305 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3306 not 00:00 on April's last Friday. 2015's transition will therefore be on 3307 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3308 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3309 3310 Changes affecting past timestamps 3311 3312 The following changes affect some pre-1991 Chile-related timestamps 3313 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3314 3315 The 1910 transition was January 10, not January 1. 3316 3317 The 1918 transition was September 10, not September 1. 3318 3319 The UT -04 time observed from 1932 to 1942 is now considered to 3320 be standard time, not year-round DST. 3321 3322 Santiago observed DST (UT -03) from 1946-07-15 through 3323 1946-08-31, then reverted to standard time, then switched to -05 3324 on 1947-04-01. 3325 3326 Assume transitions before 1968 were at 00:00, since we have no data 3327 saying otherwise. 3328 3329 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3330 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3331 3332 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3333 and omit all transitions on Pacific/Easter from 1942 through 1946 3334 since we have no data suggesting that they existed. 3335 3336 One more zone has been turned into a link, as it differed 3337 from an existing zone only for older timestamps. As usual, 3338 this change affects UT offsets in pre-1970 timestamps only. 3339 The zone's old contents have been moved to the 'backzone' file. 3340 The affected zone is America/Montreal. 3341 3342 Changes affecting commentary 3343 3344 Mention the TZUpdater tool. 3345 3346 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3347 3348 3349Release 2015b - 2015-03-19 23:28:11 -0700 3350 3351 Changes affecting future timestamps 3352 3353 Mongolia will start observing DST again this year, from the last 3354 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3355 (Thanks to Ganbold Tsagaankhuu.) 3356 3357 Palestine will start DST on March 28, not March 27. Also, 3358 correct the fall 2014 transition from September 26 to October 24. 3359 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3360 3361 Changes affecting past timestamps 3362 3363 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3364 regression. (Thanks to Stuart Bishop for reporting the problem.) 3365 3366 Some more zones have been turned into links, when they differed 3367 from existing zones only for older timestamps. As usual, 3368 these changes affect UT offsets in pre-1970 timestamps only. 3369 Their old contents have been moved to the 'backzone' file. 3370 The affected zones are: America/Antigua, America/Cayman, 3371 Pacific/Midway, and Pacific/Saipan. 3372 3373 Changes affecting time zone abbreviations 3374 3375 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3376 (Thanks to Hank W.) 3377 3378 Changes affecting code 3379 3380 Fix integer overflow bug in reference 'mktime' implementation. 3381 (Problem reported by Jörg Richter.) 3382 3383 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3384 to be used in the same executable as standard-library time_t functions. 3385 (Problems reported by Bradley White.) 3386 3387 Changes affecting commentary 3388 3389 Cite the recent Mexican decree changing Quintana Roo's time zone. 3390 (Thanks to Carlos Raúl Perasso.) 3391 3392 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3393 3394 Update info about Mars time. 3395 3396 3397Release 2015a - 2015-01-29 22:35:20 -0800 3398 3399 Changes affecting future timestamps 3400 3401 The Mexican state of Quintana Roo, represented by America/Cancun, 3402 will shift from Central Time with DST to Eastern Time without DST 3403 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3404 3405 Chile will not change clocks in April or thereafter; its new standard time 3406 will be its old daylight saving time. This affects America/Santiago, 3407 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3408 3409 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3410 (Thanks to Tim Parenti.) 3411 3412 Changes affecting past timestamps 3413 3414 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3415 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3416 Shanks about time in Iceland between 1837 and 1908. 3417 3418 Some more zones have been turned into links, when they differed 3419 from existing zones only for older timestamps. As usual, 3420 these changes affect UT offsets in pre-1970 timestamps only. 3421 Their old contents have been moved to the 'backzone' file. 3422 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3423 and Asia/Muscat. 3424 3425 Changes affecting code 3426 3427 tzalloc now scrubs time zone abbreviations compatibly with the way 3428 that tzset always has, by replacing invalid bytes with '_' and by 3429 shortening too-long abbreviations. 3430 3431 tzselect ports to POSIX awk implementations, no longer mishandles 3432 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3433 settings to the user. (Thanks to Stefan Kuhn.) 3434 3435 Changes affecting build procedure 3436 3437 'make check' now checks for links to links in the data. 3438 One such link (for Africa/Asmera) has been fixed. 3439 (Thanks to Stephen Colebourne for pointing out the problem.) 3440 3441 Changes affecting commentary 3442 3443 The leapseconds file commentary now mentions the expiration date. 3444 (Problem reported by Martin Burnicki.) 3445 3446 Update Mexican Library of Congress URL. 3447 3448 3449Release 2014j - 2014-11-10 17:37:11 -0800 3450 3451 Changes affecting current and future timestamps 3452 3453 Turks & Caicos' switch from US eastern time to UT -04 year-round 3454 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3455 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3456 3457 Changes affecting past timestamps 3458 3459 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3460 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3461 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3462 longer guess that Pyongyang mimicked Seoul time after World War II, 3463 as this is politically implausible. 3464 3465 Some more zones have been turned into links, when they differed 3466 from existing zones only for older timestamps. As usual, 3467 these changes affect UT offsets in pre-1970 timestamps only. 3468 Their old contents have been moved to the 'backzone' file. 3469 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3470 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3471 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3472 Indian/Mayotte. 3473 3474 Changes affecting commentary 3475 3476 The commentary is less enthusiastic about Shanks as a source, 3477 and is more careful to distinguish UT from UTC. 3478 3479 3480Release 2014i - 2014-10-21 22:04:57 -0700 3481 3482 Changes affecting future timestamps 3483 3484 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3485 (Thanks to Ken Rylander for the heads-up.) Guess that future 3486 years will use a similar pattern. 3487 3488 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3489 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3490 (Thanks to Kiley Walbom for the heads-up.) 3491 3492 Changes affecting time zone abbreviations 3493 3494 Since Belarus is not changing its clocks even though Moscow is, 3495 the time zone abbreviation in Europe/Minsk is changing from FET 3496 to its more traditional value MSK on 2014-10-26 at 01:00. 3497 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3498 3499 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3500 Indochina, to distinguish it better from ICT (+07). 3501 3502 Changes affecting past timestamps 3503 3504 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3505 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's 3506 authoritative book). Asia/Ho_Chi_Minh has been added to 3507 zone1970.tab, to give tzselect users in Vietnam two choices, 3508 since north and south Vietnam disagreed after our 1970 cutoff. 3509 3510 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3511 they differed from existing zones only for older timestamps. As 3512 usual, these changes affect pre-1970 timestamps only. Their old 3513 contents have been moved to the 'backzone' file. 3514 3515 Changes affecting code 3516 3517 The time-related library functions now set errno on failure, and 3518 some crashes in the new tzalloc-related library functions have 3519 been fixed. (Thanks to Christos Zoulas for reporting most of 3520 these problems and for suggesting fixes.) 3521 3522 If USG_COMPAT is defined and the requested timestamp is standard time, 3523 the tz library's localtime and mktime functions now set the extern 3524 variable timezone to a value appropriate for that timestamp; and 3525 similarly for ALTZONE, daylight saving time, and the altzone variable. 3526 This change is a companion to the tzname change in 2014h, and is 3527 designed to make timezone and altzone more compatible with tzname. 3528 3529 The tz library's functions now set errno to EOVERFLOW if they fail 3530 because the result cannot be represented. ctime and ctime_r now 3531 return NULL and set errno when a timestamp is out of range, rather 3532 than having undefined behavior. 3533 3534 Some bugs associated with the new 2014g functions have been fixed. 3535 This includes a bug that largely incapacitated the new functions 3536 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3537 It also includes some uses of uninitialized variables after tzalloc. 3538 The new code uses the standard type 'ssize_t', which the Makefile 3539 now gives porting advice about. 3540 3541 Changes affecting commentary 3542 3543 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3544 3545 3546Release 2014h - 2014-09-25 18:59:03 -0700 3547 3548 Changes affecting past timestamps 3549 3550 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3551 3552 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3553 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3554 3555 Some more zones have been turned into links, when they differed 3556 from existing zones only for older timestamps. As usual, 3557 these changes affect UT offsets in pre-1970 timestamps only. 3558 Their old contents have been moved to the 'backzone' file. 3559 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3560 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3561 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3562 3563 Changes affecting code 3564 3565 zdump -V and -v now output gmtoff= values on all platforms, 3566 not merely on platforms defining TM_GMTOFF. 3567 3568 The tz library's localtime and mktime functions now set tzname to a value 3569 appropriate for the requested timestamp, and zdump now uses this 3570 on platforms not defining TM_ZONE, fixing a 2014g regression. 3571 (Thanks to Tim Parenti for reporting the problem.) 3572 3573 The tz library no longer sets tzname if localtime or mktime fails. 3574 3575 zdump -c no longer mishandles transitions near year boundaries. 3576 (Thanks to Tim Parenti for reporting the problem.) 3577 3578 An access to uninitialized data has been fixed. 3579 (Thanks to Jörg Richter for reporting the problem.) 3580 3581 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3582 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3583 and two threads race to initialize data used by gmtime-like functions. 3584 (Thanks to Andy Heninger for reporting the problems.) 3585 3586 Changes affecting build procedure 3587 3588 'make check' now checks better for properly sorted data. 3589 3590 Changes affecting documentation and commentary 3591 3592 zdump's gmtoff=N output is now documented, and its isdst=D output 3593 is now documented to possibly output D values other than 0 or 1. 3594 3595 zdump -c's treatment of years is now documented to use the 3596 Gregorian calendar and Universal Time without leap seconds, 3597 and its behavior at cutoff boundaries is now documented better. 3598 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3599 3600 Programs are now documented to use the proleptic Gregorian calendar. 3601 (Thanks to Alan Barrett for the suggestion.) 3602 3603 Fractional-second GMT offsets have been documented for civil time 3604 in 19th-century Chennai, Jakarta, and New York. 3605 3606 3607Release 2014g - 2014-08-28 12:31:23 -0700 3608 3609 Changes affecting future timestamps 3610 3611 Turks & Caicos is switching from US eastern time to UT -04 3612 year-round, modeled as a switch on 2014-11-02 at 02:00. 3613 [As noted in 2014j, this switch was later delayed.] 3614 3615 Changes affecting past timestamps 3616 3617 Time in Russia or the USSR before 1926 or so has been corrected by 3618 a few seconds in the following zones: Asia/Irkutsk, 3619 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3620 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3621 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3622 Vladimir Karpinsky.) 3623 3624 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3625 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3626 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3627 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3628 (Thanks to Stephen Colebourne for pointing to the decree.) 3629 3630 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3631 3632 A new file 'backzone' contains data which may appeal to 3633 connoisseurs of old timestamps, although it is out of scope for 3634 the tz database, is often poorly sourced, and contains some data 3635 that is known to be incorrect. The new file is not recommended 3636 for ordinary use and its entries are not installed by default. 3637 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3638 Isle of Man entries.) 3639 3640 Some more zones have been turned into links, when they differed 3641 from existing zones only for older timestamps. As usual, 3642 these changes affect UT offsets in pre-1970 timestamps only. 3643 Their old contents have been moved to the 'backzone' file. 3644 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3645 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3646 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3647 3648 Changes affecting code 3649 3650 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3651 supplies functions for creating and using objects that represent 3652 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3653 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3654 time2posix_z. They are intended for performance: for example, 3655 localtime_rz (unlike localtime_r) is trivially thread-safe without 3656 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3657 functions, and to Alan Barrett and Jonathan Lennox for helping to 3658 debug the change.) 3659 3660 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3661 This lets zdump use tz features even if the system library lacks them. 3662 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3663 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3664 3665 zdump now uses localtime_rz if available, as it's significantly faster, 3666 and it can help zdump better diagnose invalid timezone names. 3667 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3668 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3669 not available, zdump now uses localtime_r and tzset if available, 3670 as this is a bit cleaner and faster than plain localtime. Compile 3671 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3672 lacks these two functions. 3673 3674 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3675 Although not needed for tz's own applications, which are single-threaded, 3676 this supports POSIX better if the tz library is used in multithreaded apps. 3677 3678 Some crashes have been fixed when zdump or the tz library is given 3679 invalid or outlandish input. 3680 3681 The tz library no longer mishandles leap seconds on platforms with 3682 unsigned time_t in timezones that lack ordinary transitions after 1970. 3683 3684 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3685 already defined, to make it easier to configure on common platforms. 3686 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3687 3688 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3689 assumes that reading uninitialized memory yields garbage values 3690 but does not cause other problems such as traps. 3691 3692 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3693 more likely to guess right for ambiguous timestamps near 3694 transitions where tm_isdst does not change. 3695 3696 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3697 strftime_l for compatibility with recent versions of POSIX. 3698 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3699 to 1 on recent POSIX versions, and to 0 otherwise. 3700 3701 tzselect -c now uses a hybrid distance measure that works better 3702 in Africa. (Thanks to Alan Barrett for noting the problem.) 3703 3704 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3705 or when time_tz is defined. 3706 3707 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3708 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3709 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3710 This affects GNU/Linux and similar systems. 3711 3712 For easier maintenance later, some C code has been simplified, 3713 some lint has been removed, and the code has been tweaked so that 3714 plain 'make' is more likely to work. 3715 3716 The C type 'bool' is now used for boolean values, instead of 'int'. 3717 3718 The long-obsolete LOCALE_HOME code has been removed. 3719 3720 The long-obsolete 'gtime' function has been removed. 3721 3722 Changes affecting build procedure 3723 3724 'zdump' no longer links in ialloc.o, as it's not needed. 3725 3726 'make check_time_t_alternatives' no longer assumes GNU diff. 3727 3728 Changes affecting distribution tarballs 3729 3730 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3731 the tzdata tarball instead of the tzcode tarball, since they help 3732 maintain the data. The NEWS and Theory files are now also 3733 distributed in the tzdata tarball, as they're relevant for data. 3734 (Thanks to Alan Barrett for pointing this out.) Also, the 3735 leapseconds.awk file is no longer distributed in the tzcode 3736 tarball, since it belongs in the tzdata tarball (where 2014f 3737 inadvertently also distributed it). 3738 3739 Changes affecting documentation and commentary 3740 3741 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3742 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3743 for debugging it.) 3744 3745 The man pages have been updated to use function prototypes, 3746 to document thread-safe variants like localtime_r, and to document 3747 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3748 mktime_z. 3749 3750 The fields in Link lines have been renamed to be more descriptive 3751 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3752 and LINK-TO has become LINK-NAME. 3753 3754 tz-link.htm mentions the IETF's tzdist working group; Windows 3755 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3756 3757 Some broken URLs have been fixed in the commentary. (Thanks to 3758 Lester Caine.) 3759 3760 Commentary about Philippines DST has been updated, and commentary 3761 on pre-1970 time in India has been added. 3762 3763 3764Release 2014f - 2014-08-05 17:42:36 -0700 3765 3766 Changes affecting future timestamps 3767 3768 Russia will subtract an hour from most of its time zones on 2014-10-26 3769 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3770 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3771 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3772 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3773 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3774 (Europe/Samara) are not changing their clocks. The changed zones are 3775 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3776 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3777 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3778 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3779 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3780 but not its UTC offset. Two zones are added: Asia/Chita (split 3781 from Asia/Yakutsk, and also with two hours subtracted) and 3782 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3783 subtracted). (Thanks to Tim Parenti for much of the above.) 3784 3785 Changes affecting time zone abbreviations 3786 3787 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3788 and similarly for the other Australian zones. That is, for eastern 3789 standard and daylight saving time the abbreviations are AEST and AEDT 3790 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3791 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3792 This change does not affect UT offsets, only time zone abbreviations. 3793 (Thanks to Rich Tibbett and many others.) 3794 3795 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3796 effective 2014-10-26 at 02:00 local time. 3797 3798 The time zone abbreviation for Xinjiang Time (observed in Ürümqi) 3799 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3800 3801 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3802 Similarly, prefer EET/EEST for eastern European time in Russia. 3803 3804 Change time zone abbreviations in (western) Samoa to use "ST" and 3805 "DT" suffixes, as this is more likely to match common practice. 3806 Prefix "W" to (western) Samoa time when its standard-time offset 3807 disagrees with that of American Samoa. 3808 3809 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3810 3811 Time zone abbreviations have been updated for Japan's two time 3812 zones used 1896-1937. JWST now stands for Western Standard 3813 Time, and JCST for Central Standard Time (formerly this was CJT). 3814 These abbreviations are now used for time in Korea, Taiwan, 3815 and Sakhalin while controlled by Japan. 3816 3817 Changes affecting past timestamps 3818 3819 China's five zones have been simplified to two, since the post-1970 3820 differences in the other three seem to have been imaginary. The 3821 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3822 removed; backwards-compatibility links still work, albeit with 3823 different behaviors for timestamps before May 1980. Asia/Urumqi's 3824 1980 transition to UT +08 has been removed, so that it is now at 3825 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3826 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3827 3828 Some zones have been turned into links, when they differed from existing 3829 zones only for older UT offsets where data entries were likely invented. 3830 These changes affect UT offsets in pre-1970 timestamps only. This is 3831 similar to the change in release 2013e, except this time for western 3832 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3833 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3834 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3835 Atlantic/St_Helena. This also affects the backwards-compatibility 3836 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3837 Tim Parenti, and David Patte for reporting problems in earlier 3838 versions of this change.) 3839 3840 Asia/Shanghai's pre-standard-time UT offset has been changed from 3841 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3842 transition to standard time has been changed from 1928 to 1901. 3843 3844 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3845 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3846 In 1946 it observed DST from 05-15 through 09-30; in 1947 3847 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3848 (Thanks to Yu-Cheng Chuang.) 3849 3850 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3851 3852 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3853 10-03 at 00:00. (Thanks to Konstantin Hyppönen.) 3854 3855 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3856 period from 1911 to 1950. 3857 3858 Pacific/Chatham has been changed to New Zealand standard time plus 3859 45 minutes for the period before 1957, reflecting a 1956 remark in 3860 the New Zealand parliament. 3861 3862 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3863 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3864 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3865 not 04-06 at 02:00; and there was no DST in 1920. 3866 3867 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3868 3869 Time in Russia before 1927 or so has been corrected by a few seconds in 3870 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3871 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3872 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3873 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3874 3875 Changes affecting data format 3876 3877 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3878 The new file's extended format allows multiple country codes per zone. 3879 The older file is still installed but is deprecated; its format is 3880 not changing and it will still be distributed for a while, but new 3881 applications should use the new file. 3882 3883 The new file format simplifies maintenance of obscure locations. 3884 To test this, it adds coverage for the Crozet Islands and the 3885 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3886 3887 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3888 It is still ASCII now, but commentary about the switch has been added. 3889 The new file 'zone1970.tab' already uses UTF-8. 3890 3891 Changes affecting code 3892 3893 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3894 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3895 3896 'zic' no longer mishandles input when ignoring case in locales that 3897 are not compatible with English, e.g., unibyte Turkish locales when 3898 compiled with HAVE_GETTEXT. 3899 3900 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3901 they no longer use ASCII '-' as if it were a dash. 3902 3903 'zic' now rejects output file names that contain '.' or '..' components. 3904 (Thanks to Tim Parenti for reporting the problem.) 3905 3906 'zic -v' now warns about output file names that do not follow 3907 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3908 David Olson for starting the ball rolling on this.) 3909 3910 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3911 3912 Changes affecting build procedure 3913 3914 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3915 (Thanks to John Cochran.) 3916 3917 Changes affecting documentation and commentary 3918 3919 The 'Theory' file documents legacy names, the longstanding 3920 exceptions to the POSIX-inspired file name rules. 3921 3922 The 'zic' documentation clarifies the role of time types when 3923 interpreting dates. (Thanks to Arthur David Olson.) 3924 3925 Documentation and commentary now prefer UTF-8 to US-ASCII, 3926 allowing the use of proper accents in foreign words and names. 3927 Code and data have not changed because of this. (Thanks to 3928 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3929 this.) 3930 3931 Non-HTML documentation and commentary now use plain-text URLs instead of 3932 HTML insertions, and are more consistent about bracketing URLs when they 3933 are not already surrounded by white space. (Thanks to suggestions by 3934 Steffen Nurpmeso.) 3935 3936 There is new commentary about Xujiahui Observatory, the five time-zone 3937 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3938 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3939 warlord Jin Shuren in the data. 3940 3941 Commentary about the coverage of each Russian zone has been standardized. 3942 (Thanks to Tim Parenti.) 3943 3944 There is new commentary about contemporary timekeeping in Ethiopia. 3945 3946 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3947 3948 There is new commentary about time in Poland in 1919. 3949 3950 Proper credit has been given to DST inventor George Vernon Hudson. 3951 3952 Commentary about time in Metlakatla, AK and Resolute, NU has been 3953 improved, with a new source for the former. 3954 3955 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it 3956 is uninhabited. 3957 3958 Commentary about permanent Antarctic bases has been updated. 3959 3960 Several typos have been corrected. (Thanks to Tim Parenti for 3961 contributing some of these fixes.) 3962 3963 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3964 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3965 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3966 (Thanks to a heads-up from Dirkjan Ochtman.) 3967 3968 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3969 have been removed. These obsolescent US Naval Observatory entries were no 3970 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3971 3972 3973Release 2014e - 2014-06-12 21:53:52 -0700 3974 3975 Changes affecting near-future timestamps 3976 3977 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3978 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3979 switch to standard time at 24:00 the last Thursday before Ramadan, and 3980 back to DST at 00:00 the first Friday after Ramadan. 3981 3982 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3983 to Milamber Space Network.) Guess that from 2015 on Morocco will 3984 temporarily switch to standard time at 03:00 the last Saturday before 3985 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3986 3987 Changes affecting past timestamps 3988 3989 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3990 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3991 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3992 in 1991. (Thanks to Hank W. for reporting the problems.) 3993 3994 Changes affecting commentary 3995 3996 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3997 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3998 removes stale pointers to World Time Explorer and WORLDTIME. 3999 4000 4001Release 2014d - 2014-05-27 21:34:40 -0700 4002 4003 Changes affecting code 4004 4005 zic no longer generates files containing timestamps before the Big Bang. 4006 This works around GNOME glib bug 878 4007 <https://gitlab.gnome.org/GNOME/glib/issues/878> 4008 (Thanks to Leonardo Chiquitto for reporting the bug, and to 4009 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 4010 4011 Changes affecting documentation 4012 4013 tz-link.htm now mentions GNOME. 4014 4015 4016Release 2014c - 2014-05-13 07:44:13 -0700 4017 4018 Changes affecting near-future timestamps 4019 4020 Egypt observes DST starting 2014-05-15 at 24:00. 4021 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 4022 Details have not been announced, except that DST will not be observed 4023 during Ramadan. Guess that DST will stop during the same Ramadan dates as 4024 Morocco, and that Egypt's future spring and fall transitions will be the 4025 same as 2010 when it last observed DST, namely April's last Friday at 4026 00:00 to September's last Thursday at 23:00 standard time. Also, guess 4027 that Ramadan transitions will be at 00:00 standard time. 4028 4029 Changes affecting code 4030 4031 zic now generates transitions for minimum time values, eliminating guesswork 4032 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 4033 4034 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 4035 4036 Changes affecting commentary and documentation 4037 4038 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4039 4040 4041Release 2014b - 2014-03-24 21:28:50 -0700 4042 4043 Changes affecting near-future timestamps 4044 4045 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4046 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4047 4048 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4049 Bengt-Inge Larsson.) This is currently an approximation; a better version 4050 will require the zic and localtime fixes mentioned below, and the plan is 4051 to wait for a while until at least the zic fixes propagate. 4052 4053 Changes affecting code 4054 4055 'zic' and 'localtime' no longer reject locations needing four transitions 4056 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4057 Also, 'zic' avoids some unlikely failures due to integer overflow. 4058 4059 Changes affecting build procedure 4060 4061 'make check' now detects Rule lines defined but never used. 4062 The NZAQ rules, an instance of this problem, have been removed. 4063 4064 Changes affecting commentary and documentation 4065 4066 Fix Tuesday/Thursday typo in description of time in Israel. 4067 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4068 4069 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4070 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4071 library supports them. 4072 4073 Add comments about Johnston Island time in the 1960s. 4074 (Thanks to Lyle McElhaney.) 4075 4076 Morocco's 2014 DST start will be as predicted. 4077 (Thanks to Sebastien Willemijns.) 4078 4079 4080Release 2014a - 2014-03-07 23:30:29 -0800 4081 4082 Changes affecting near-future timestamps 4083 4084 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4085 the heads-up, and to Tim Parenti for simplifying the update.) 4086 4087 Changes affecting past timestamps 4088 4089 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4090 (Thanks to Steffen Thorsen.) 4091 4092 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4093 (not 1992-01-01), and observed DST during the entire next winter. 4094 (Thanks to Vladimir in Moscow via Alois Treindl.) 4095 4096 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4097 (Thanks to Avigdor Finkelstein.) 4098 4099 Changes affecting code 4100 4101 A uninitialized-storage bug in 'localtime' has been fixed. 4102 (Thanks to Logan Chien.) 4103 4104 Changes affecting the build procedure 4105 4106 The settings for 'make check_web' now default to Ubuntu 13.10. 4107 4108 Changes affecting commentary and documentation 4109 4110 The boundary of the US Pacific time zone is given more accurately. 4111 (Thanks to Alan Mintz.) 4112 4113 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.) 4114 4115 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.) 4116 4117 Better descriptions of countries with same time zone history as 4118 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4119 4120 Several changes affect tz-link.htm, the main web page. 4121 4122 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4123 David Braverman). 4124 4125 Mention xCal (Internet RFC 6321) and jCal. 4126 4127 Microsoft has some support for tz database names. 4128 4129 CLDR data formats include both XML and JSON. 4130 4131 Mention Maggiolo's map of solar vs standard time. 4132 (Thanks to Arthur David Olson.) 4133 4134 Mention TZ4Net. (Thanks to Matt Johnson.) 4135 4136 Mention the timezone-olson Haskell package. 4137 4138 Mention zeitverschiebung.net. (Thanks to Martin Jäger.) 4139 4140 Remove moribund links to daylight-savings-time.info and to 4141 Simple Timer + Clocks. 4142 4143 Update two links. (Thanks to Oscar van Vlijmen.) 4144 4145 Fix some formatting glitches, e.g., remove random newlines from 4146 abbr elements' title attributes. 4147 4148 4149Release 2013i - 2013-12-17 07:25:23 -0800 4150 4151 Changes affecting near-future timestamps: 4152 4153 Jordan switches back to standard time at 00:00 on December 20, 2013. 4154 The 2006-2011 transition schedule is planned to resume in 2014. 4155 (Thanks to Steffen Thorsen.) 4156 4157 Changes affecting past timestamps: 4158 4159 In 2004, Cuba began DST on March 28, not April 4. 4160 (Thanks to Steffen Thorsen.) 4161 4162 Changes affecting code 4163 4164 The compile-time flag NOSOLAR has been removed, as nowadays the 4165 benefit of slightly shrinking runtime table size is outweighed by the 4166 cost of disallowing potential future updates that exceed old limits. 4167 4168 Changes affecting documentation and commentary 4169 4170 The files solar87, solar88, and solar89 are no longer distributed. 4171 They were a negative experiment - that is, a demonstration that 4172 tz data can represent solar time only with some difficulty and error. 4173 Their presence in the distribution caused confusion, as Riyadh 4174 civil time was generally not solar time in those years. 4175 4176 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4177 4178 4179Release 2013h - 2013-10-25 15:32:32 -0700 4180 4181 Changes affecting current and future timestamps: 4182 4183 Libya has switched its UT offset back to +02 without DST, instead 4184 of +01 with DST. (Thanks to Even Scharning.) 4185 4186 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4187 (Thanks to Gwillim Law.) 4188 4189 Changes affecting future timestamps: 4190 4191 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4192 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4193 (Thanks to Steffen Thorsen.) 4194 4195 Add entries for DST transitions in Morocco in the year 2038. 4196 This avoids some year-2038 glitches introduced in 2013g. 4197 (Thanks to Yoshito Umaoka for reporting the problem.) 4198 4199 Changes affecting API 4200 4201 The 'tzselect' command no longer requires the 'select' command, 4202 and should now work with /bin/sh on more platforms. It also works 4203 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4204 Patrick 'P. J.' McDermott and Alan Barrett.) 4205 4206 Changes affecting code 4207 4208 Fix localtime overflow bugs with 32-bit unsigned time_t. 4209 4210 zdump no longer assumes sscanf returns maximal values on overflow. 4211 4212 Changes affecting the build procedure 4213 4214 The builder can specify which programs to use, if any, instead of 4215 'ar' and 'ranlib', and libtz.a is now built locally before being 4216 installed. (Thanks to Michael Forney.) 4217 4218 A dependency typo in the 'zdump' rule has been fixed. 4219 (Thanks to Andrew Paprocki.) 4220 4221 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4222 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4223 4224 'make clean' no longer removes 'leapseconds', since it's 4225 host-independent and is part of the distribution. 4226 4227 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4228 4229 Changes affecting documentation and commentary 4230 4231 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4232 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4233 4234 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4235 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4236 longer maintained) and for old advisories. SOFA now does C. 4237 4238Release 2013g - 2013-09-30 21:08:26 -0700 4239 4240 Changes affecting current and near-future timestamps 4241 4242 Morocco now observes DST from the last Sunday in March to the last 4243 Sunday in October, not April to September respectively. (Thanks 4244 to Steffen Thorsen.) 4245 4246 Changes affecting 'zic' 4247 4248 'zic' now runs on platforms that lack both hard links and symlinks. 4249 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4250 Also, fix some bugs on platforms that lack hard links but have symlinks. 4251 4252 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4253 to predict the far future, fixing a bug introduced in 2013e. 4254 4255 Changes affecting the build procedure 4256 4257 The 'leapseconds' file is again put into the tzdata tarball. 4258 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4259 Matt Burgess and Ian Abbott.) The timestamps of these and other 4260 dependent files in tarballs are adjusted more consistently. 4261 4262 Changes affecting documentation and commentary 4263 4264 The README file is now part of the data tarball as well as the code. 4265 It now states that files are public domain unless otherwise specified. 4266 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4267 Its details about the 1989 release moved to a place of honor near 4268 the end of NEWS. 4269 4270 4271Release 2013f - 2013-09-24 23:37:36 -0700 4272 4273 Changes affecting near-future timestamps 4274 4275 Tocantins will very likely not observe DST starting this spring. 4276 (Thanks to Steffen Thorsen.) 4277 4278 Jordan will likely stay at UT +03 indefinitely, and will not fall 4279 back this fall. 4280 4281 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4282 4283 Changes affecting API 4284 4285 The types of the global variables 'timezone' and 'altzone' (if present) 4286 have been changed back to 'long'. This is required for 'timezone' 4287 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4288 These variables were originally 'long' in the tz code, but were 4289 mistakenly changed to 'time_t' in 1987; nobody reported the 4290 incompatibility until now. The difference matters on x32, where 4291 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4292 4293 Changes affecting the build procedure 4294 4295 Avoid long strings in leapseconds.awk to work around a mawk bug. 4296 (Thanks to Cyril Baurand.) 4297 4298 Changes affecting documentation and commentary 4299 4300 New file 'NEWS' that contains release notes like this one. 4301 4302 Paraguay's law does not specify DST transition time; 00:00 is customary. 4303 (Thanks to Waldemar Villamayor-Venialbo.) 4304 4305 Minor capitalization fixes. 4306 4307 Changes affecting version-control only 4308 4309 The experimental GitHub repository now contains annotated and 4310 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4311 Releases are tagged starting with 2012e; earlier releases were 4312 done differently, and tags would either not have a simple name or 4313 not exactly match what was released. 4314 4315 'make set-timestamps' is now simpler and a bit more portable. 4316 4317 4318Release 2013e - 2013-09-19 23:50:04 -0700 4319 4320 Changes affecting near-future timestamps 4321 4322 This year Fiji will start DST on October 27, not October 20. 4323 (Thanks to David Wheeler for the heads-up.) For now, guess that 4324 Fiji will continue to spring forward the Sunday before the fourth 4325 Monday in October. 4326 4327 Changes affecting current and future time zone abbreviations 4328 4329 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4330 time zone abbreviations since 1932. (Thanks to George Ziegler, 4331 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4332 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4333 Asia/Makassar, and Asia/Pontianak. 4334 4335 Use ART (UT -03, standard time), rather than WARST (also -03, but 4336 daylight saving time) for San Luis, Argentina since 2009. 4337 4338 Changes affecting Godthåb timestamps after 2037 if version mismatch 4339 4340 Allow POSIX-like TZ strings where the transition time's hour can 4341 range from -167 through 167, instead of the POSIX-required 0 4342 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4343 new Fiji rules. This is a more compact way to represent 4344 far-future timestamps for America/Godthab, America/Santiago, 4345 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4346 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4347 this change. (Derived from a suggestion by Arthur David Olson.) 4348 4349 Allow POSIX-like TZ strings where daylight saving time is in 4350 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4351 Argentina Summer Time all year. This supports a more compact way 4352 to represent the 2013d data for America/Argentina/San_Luis. 4353 Because of the change for San Luis noted above this change does not 4354 affect the current data. (Thanks to Andrew Main (Zefram) for 4355 suggestions that improved this change.) 4356 4357 Where these two TZ changes take effect, there is a minor extension 4358 to the tz file format in that it allows new values for the 4359 embedded TZ-format string, and the tz file format version number 4360 has therefore been increased from 2 to 3 as a precaution. 4361 Version-2-based client code should continue to work as before for 4362 all timestamps before 2038. Existing version-2-based client code 4363 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4364 files, and typically works in practice even for timestamps after 4365 2037; the only known exception is America/Godthab. 4366 4367 Changes affecting timestamps before 1970 4368 4369 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4370 some errors before 1947. 4371 4372 Some zones have been turned into links, when they differ from existing 4373 zones only in older data entries that were likely invented or that 4374 differ only in LMT or transitions from LMT. These changes affect 4375 only timestamps before 1943. The affected zones are: 4376 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4377 America/Grenada, America/Guadeloupe, America/Marigot, 4378 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4379 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4380 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4381 confirming that the old Europe/Vaduz zone was wrong and the new 4382 link is better for WWII-era times.) 4383 4384 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4385 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4386 from 1890 to 1912. 4387 4388 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4389 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4390 to Alois Treindl.) 4391 4392 Change the date of the circa-1850 Zurich transition from 1849-09-12 4393 to 1853-07-16, overriding Shanks with data from Messerli about 4394 postal and telegraph time in Switzerland. 4395 4396 Changes affecting time zone abbreviations before 1970 4397 4398 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4399 as Jakarta was called Batavia back then. 4400 4401 Changes affecting API 4402 4403 The 'zic' command now outputs a dummy transition when far-future 4404 data can't be summarized using a TZ string, and uses a 402-year 4405 window rather than a 400-year window. For the current data, this 4406 affects only the Asia/Tehran file. It does not affect any of the 4407 timestamps that this file represents, so zdump outputs the same 4408 information as before. (Thanks to Andrew Main (Zefram).) 4409 4410 The 'date' command has a new '-r' option, which lets you specify 4411 the integer time to display, a la FreeBSD. 4412 4413 The 'tzselect' command has two new options '-c' and '-n', which lets you 4414 select a zone based on latitude and longitude. 4415 4416 The 'zic' command's '-v' option now warns about constructs that 4417 require the new version-3 binary file format. (Thanks to Arthur 4418 David Olson for the suggestion.) 4419 4420 Support for floating-point time_t has been removed. 4421 It was always dicey, and POSIX no longer requires it. 4422 (Thanks to Eric Blake for suggesting to the POSIX committee to 4423 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4424 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4425 bugs and elucidating some of the corners of the old floating-point 4426 implementation.) 4427 4428 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4429 changed back to the old practice of using 'long' to represent UT 4430 offsets. This had been inadvertently and mistakenly changed to 4431 'int_fast32_t'. (Thanks to Christos Zoulas.) 4432 4433 The code avoids undefined behavior on integer overflow in some 4434 more places, including gmtime, localtime, mktime and zdump. 4435 4436 Changes affecting the zdump utility 4437 4438 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4439 "UTC" does not make sense for timestamps that predate the introduction 4440 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4441 for clarifying UT vs UTC.) 4442 4443 Data changes affecting behavior of tzselect and similar programs 4444 4445 Country code BQ is now called the more common name "Caribbean Netherlands" 4446 rather than the more official "Bonaire, St Eustatius & Saba". 4447 4448 Remove from zone.tab the names America/Montreal, America/Shiprock, 4449 and Antarctica/South_Pole, as they are equivalent to existing 4450 same-country-code zones for post-1970 timestamps. The data entries for 4451 these names are unchanged, so the names continue to work as before. 4452 4453 Changes affecting code internals 4454 4455 zic -c now runs way faster on 64-bit hosts when given large numbers. 4456 4457 zic now uses vfprintf to avoid allocating and freeing some memory. 4458 4459 tzselect now computes the list of continents from the data, 4460 rather than have it hard-coded. 4461 4462 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4463 4464 Changes affecting the build procedure 4465 4466 The 'leapseconds' file is now generated automatically from a 4467 new file 'leap-seconds.list', which is a copy of 4468 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4469 A new source file 'leapseconds.awk' implements this. 4470 The goal is simplification of the future maintenance of 'leapseconds'. 4471 4472 When building the 'posix' or 'right' subdirectories, if the 4473 subdirectory would be a copy of the default subdirectory, it is 4474 now made a symbolic link if that is supported. This saves about 4475 2 MB of file system space. 4476 4477 The links America/Shiprock and Antarctica/South_Pole have been 4478 moved to the 'backward' file. This affects only nondefault builds 4479 that omit 'backward'. 4480 4481 Changes affecting version-control only 4482 4483 .gitignore now ignores 'date'. 4484 4485 Changes affecting documentation and commentary 4486 4487 Changes to the 'tzfile' man page 4488 4489 It now mentions that the binary file format may be extended in 4490 future versions by appending data. 4491 4492 It now refers to the 'zdump' and 'zic' man pages. 4493 4494 Changes to the 'zic' man page 4495 4496 It lists conditions that elicit a warning with '-v'. 4497 4498 It says that the behavior is unspecified when duplicate names 4499 are given, or if the source of one link is the target of another. 4500 4501 Its examples are updated to match the latest data. 4502 4503 The definition of white space has been clarified slightly. 4504 (Thanks to Michael Deckers.) 4505 4506 Changes to the 'Theory' file 4507 4508 There is a new section about the accuracy of the tz database, 4509 describing the many ways that errors can creep in, and 4510 explaining why so many of the pre-1970 timestamps are wrong or 4511 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4512 Wollman for discussions that contributed to this). 4513 4514 The 'Theory' file describes LMT better (this follows a 4515 suggestion by Guy Harris). 4516 4517 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4518 4519 It's mentioned that excluding 'backward' should not affect the 4520 other data, and it suggests at least one zone.tab name per 4521 inhabited country (thanks to Stephen Colebourne). 4522 4523 Some longstanding restrictions on names are documented, e.g., 4524 'America/New_York' precludes 'America/New_York/Bronx'. 4525 4526 It gives more reasons for the 1970 cutoff. 4527 4528 It now mentions which time_t variants are supported, such as 4529 signed integer time_t. (Thanks to Paul Goyette for reporting 4530 typos in an experimental version of this change.) 4531 4532 (Thanks to Philip Newton for correcting typos in these changes.) 4533 4534 Documentation and commentary is more careful to distinguish UT in 4535 general from UTC in particular. (Thanks to Steve Allen.) 4536 4537 Add a better source for the Zurich 1894 transition. 4538 (Thanks to Pierre-Yves Berger.) 4539 4540 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4541 4542 4543Release 2013d - 2013-07-05 07:38:01 -0700 4544 4545 Changes affecting future timestamps: 4546 4547 Morocco's midsummer transitions this year are July 7 and August 10, 4548 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4549 4550 Israel now falls back on the last Sunday of October. 4551 (Thanks to Ephraim Silverberg.) 4552 4553 Changes affecting past timestamps: 4554 4555 Specify Jerusalem's location more precisely; this changes the pre-1880 4556 times by 2 s. 4557 4558 Changing affecting metadata only: 4559 4560 Fix typos in the entries for country codes BQ and SX. 4561 4562 Changes affecting code: 4563 4564 Rework the code to fix a bug with handling Australia/Macquarie on 4565 32-bit hosts (thanks to Arthur David Olson). 4566 4567 Port to platforms like NetBSD, where time_t can be wider than long. 4568 4569 Add support for testing time_t types other than the system's. 4570 Run 'make check_time_t_alternatives' to try this out. 4571 Currently, the tests fail for unsigned time_t; 4572 this should get fixed at some point. 4573 4574 Changes affecting documentation and commentary: 4575 4576 Deemphasize the significance of national borders. 4577 4578 Update the zdump man page. 4579 4580 Remove obsolete NOID comment (thanks to Denis Excoffier). 4581 4582 Update several URLs and comments in the web pages. 4583 4584 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4585 4586 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4587 4588 4589Release 2013c - 2013-04-19 16:17:40 -0700 4590 4591 Changes affecting current and future timestamps: 4592 4593 Palestine observed DST starting March 29, 2013. (Thanks to 4594 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4595 with the predicted rules being the last Thursday in March at 24:00 4596 to the first Friday on or after September 21 at 01:00. 4597 4598 Assume that the recent change to Paraguay's DST rules is permanent, 4599 by moving the end of DST to the 4th Sunday in March every year. 4600 (Thanks to Carlos Raúl Perasso.) 4601 4602 Changes affecting past timestamps: 4603 4604 Fix some historical data for Palestine to agree with that of 4605 timeanddate.com, as follows: 4606 4607 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4608 00:00 Apr 1. 4609 4610 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4611 02:00. 4612 4613 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4614 4615 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4616 4617 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4618 4619 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4620 4621 Fix times of habitation for Macquarie to agree with the Tasmania 4622 Parks & Wildlife Service history, which indicates that permanent 4623 habitation was 1899-1919 and 1948 on. 4624 4625 Changing affecting metadata only: 4626 4627 Macquarie Island is politically part of Australia, not Antarctica. 4628 (Thanks to Tobias Conradi.) 4629 4630 Sort Macquarie more consistently with other parts of Australia. 4631 (Thanks to Tim Parenti.) 4632 4633 4634Release 2013b - 2013-03-10 22:33:40 -0700 4635 4636 Changes affecting current and future timestamps: 4637 4638 Haiti uses US daylight-saving rules this year, and presumably future years. 4639 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4640 4641 Paraguay will end DST on March 24 this year. 4642 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4643 4644 Morocco does not observe DST during Ramadan; 4645 try to predict Ramadan in Morocco as best we can. 4646 (Thanks to Erik Homoet for the heads-up.) 4647 4648 Changes affecting commentary: 4649 4650 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4651 Update URL for Solaris. Mention Internet RFC 6557. 4652 Update Internet RFCs 2445->5545, 2822->5322. 4653 Switch from FTP to HTTP for Internet RFCs. 4654 4655 4656Release 2013a - 2013-02-27 09:20:35 -0800 4657 4658 Change affecting binary data format: 4659 4660 The zone offset at the end of version-2-format zone files is now 4661 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4662 4663 Changes affecting current and future timestamps: 4664 4665 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4666 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4667 (Thanks to Steffen Thorsen and Robert Elz.) 4668 4669 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4670 (Thanks to Tobias Conradi and Arthur David Olson.) 4671 4672 Many changes affect historical timestamps before 1940. 4673 These were deduced from: Milne J. Civil time. Geogr J. 1899 4674 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4675 4676 Changes affecting the code: 4677 4678 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4679 the data). (Thanks to Arthur David Olson.) 4680 4681 Fix localtime bug when time_t is unsigned and data files were generated 4682 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4683 to Arthur David Olson for fixing.) 4684 4685 Allow the email address for bug reports to be set by the packager. 4686 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.) 4687 4688 Update HTML checking to be compatible with Ubuntu 12.10. 4689 4690 Check that files are a safe subset of ASCII. At some point we may 4691 relax this requirement to a safe subset of UTF-8. Without the 4692 check, some non-UTF-8 encodings were leaking into the distribution. 4693 4694 Commentary changes: 4695 4696 Restore a comment about copyright notices that was inadvertently deleted. 4697 (Thanks to Arthur David Olson.) 4698 4699 Improve the commentary about which districts observe what times 4700 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4701 4702 Add web page links to tz.js. 4703 4704 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4705 4706 4707Release 2012j - 2012-11-12 18:34:49 -0800 4708 4709 Libya moved to CET this weekend, but with DST planned next year. 4710 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4711 4712 Signatures now have the extension .asc, not .sign, as that's more 4713 standard. (Thanks to Phil Pennock.) 4714 4715 The output of 'zdump --version', and of 'zic --version', now 4716 uses a format that is more typical for --version. 4717 (Thanks to Joseph S. Myers.) 4718 4719 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4720 now uses tz@iana.org rather than the old elsie address. 4721 4722 zic -v now complains about abbreviations that are less than 3 4723 or more than 6 characters, as per POSIX. Formerly, it checked 4724 for abbreviations that were more than 3. 4725 4726 'make public' no longer puts its temporary directory under /tmp, 4727 and uses the just-built zic rather than the system zic. 4728 4729 Various fixes to documentation and commentary. 4730 4731 4732Release 2012i - 2012-11-03 12:57:09 -0700 4733 4734 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4735 4736 Linker flags can now be specified via LDFLAGS. 4737 AWK now defaults to 'awk', not 'nawk'. 4738 The shell in tzselect now defaults to /bin/bash, but this can 4739 be overridden by specifying KSHELL. 4740 The main web page now mentions the unofficial GitHub repository. 4741 (Thanks to Mike Frysinger.) 4742 4743 Tarball signatures can now be built by running 'make signatures'. 4744 There are also new makefile rules 'tarballs', 'check_public', and 4745 separate makefile rules for each tarball and signature file. 4746 A few makefile rules are now more portable to strict POSIX. 4747 4748 The main web page now lists the canonical IANA URL. 4749 4750 4751Release 2012h - 2012-10-26 22:49:10 -0700 4752 4753 Bahia no longer has DST. (Thanks to Kelley Cook.) 4754 4755 Tocantins has DST. (Thanks to Rodrigo Severo.) 4756 4757 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4758 4759 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4760 4761 Web page updates. 4762 4763 More C modernization, except that at Arthur David Olson's suggestion 4764 the instances of 'register' were kept. 4765 4766 4767Release 2012g - 2012-10-17 20:59:45 -0700 4768 4769 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4770 4771 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4772 4773 Assume C89. 4774 4775 To attack the version-number problem, this release ships the file 4776 'Makefile' (which contains the release number) in both the tzcode and 4777 the tzdata tarballs. The two Makefiles are identical, and should be 4778 identical in any matching pair of tarballs, so it shouldn't matter 4779 which order you extract the tarballs. Perhaps we can come up with a 4780 better version-number scheme at some point; this scheme does have the 4781 virtue of not adding more files. 4782 4783 4784Release 2012f - 2012-09-12 23:17:03 -0700 4785 4786 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4787 20 this year. (Thanks to Steffen Thorsen.) 4788 4789 4790Release 2012e - 2012-08-02 20:44:55 -0700 4791 4792 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4793 (Thanks to Steffen Thorsen.) 4794 4795 * Use a single version number for both code and data. 4796 4797 * .gitignore: New file. 4798 4799 * Remove trailing white space. 4800 4801 4802Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4803 4804 Changes for Morocco's timestamps, which take effect in a couple of 4805 hours, along with infrastructure changes to accommodate how the tz 4806 code and data are released on IANA. 4807 4808 4809Release data2012c - 2012-03-27 12:17:25 -0400 4810 4811 africa 4812 Summer time changes for Morocco (to start late April 2012) 4813 4814 asia 4815 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4816 4817 northamerica 4818 Haiti following US/Canada rules for 2012 (and we're assuming, 4819 for now anyway, for the future). 4820 4821 4822Release 2012b - 2012-03-02 12:29:15 +0700 4823 4824 There is just one change to tzcode2012b (compared with 2012a): 4825 the Makefile that was accidentally included with 2012a has been 4826 replaced with the version that should have been there, which is 4827 identical with the previous version (from tzcode2011i). 4828 4829 There are just two changes in tzdata2012b compared with 2012a. 4830 4831 Most significantly, summer time in Cuba has been delayed 3 weeks 4832 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4833 date, as listed in 2012a) is just a little over a week away, this 4834 change is urgent. 4835 4836 Less importantly, an excess tab in one of the changes in zone.tab 4837 in 2012a has been removed. 4838 4839 4840Release 2012a - 2012-03-01 18:28:10 +0700 4841 4842 The changes in tzcode2012a (compared to the previous version, 2011i) 4843 are entirely to the README and tz-art.htm and tz-link.htm files, if 4844 none of those concern you, you can ignore the code update. The changes 4845 reflect the changed addresses for the mailing list and the code and 4846 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4847 has been added to tz-link.htm). 4848 4849 In tzdata2012a (compared to the previous release, which was 2011n) 4850 the major changes are: 4851 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4852 Falkland Islands onto permanent summer time (we're assuming for the 4853 foreseeable future, though 2012 is all we're fairly certain of.) 4854 Armenia has abolished Summer Time. 4855 Tokelau jumped the International Date Line back last December 4856 (just the same as their near neighbour, Samoa). 4857 America/Creston is a new zone for a small area of British Columbia 4858 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4859 4860 Other minor changes are: 4861 Corrections to 1918 Canadian summer time end dates. 4862 Updated URL for UK time zone history (in comments) 4863 A few typos in Le Corre's list of free French place names (comments) 4864 4865 4866Release data2011n - 2011-10-30 14:57:54 +0700 4867 4868 There are three changes of note - most urgently, Cuba (America/Havana) 4869 has extended summer time by two weeks, now to end on Nov 13, rather than 4870 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4871 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4872 all, and consequently that zone has been removed (again) and reinstated 4873 in the "backward" file as a link to Europe/Chisinau. And third, the 4874 end date for Fiji's summer time this summer was moved forward from the 4875 earlier planned Feb 26, to Jan 22. 4876 4877 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4878 (and the incorrect syntax that was in the 2011m version of that file 4879 is so fixed - it would have been fixed in a different way had this 4880 change not happened - that's the "missing" sccs version id). 4881 4882 4883Release data2011m - 2011-10-24 21:42:16 +0700 4884 4885 In particular, the typos in comments in the data (2011-11-17 should have 4886 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4887 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4888 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4889 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4890 4891 In addition, I added Europe/Tiraspol to zone.tab. 4892 4893 This time, all the files have new version numbers... (including the files 4894 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4895 version numbers there...) 4896 4897 4898Release data2011l - 2011-10-10 11:15:43 +0700 4899 4900 There are just 2 changes that cause different generated tzdata files from 4901 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4902 is included, but commented out. Compared with the diff I sent out last week, 4903 this version also includes attributions for the sources for the changes 4904 (in much the same format as ado used, but the html tags have not been 4905 checked, verified, or used in any way at all, so if there are errors there, 4906 please let me know.) 4907 4908 4909Release data2011k - 2011-09-20 17:54:03 -0400 4910 4911 [not summarized] 4912 4913 4914Release data2011j - 2011-09-12 09:22:49 -0400 4915 4916 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4917 Tanzania); there are also two spelling corrections to comments in 4918 the australasia file (with thanks to Christos Zoulas). 4919 4920 4921Release 2011i - 2011-08-29 05:56:32 -0400 4922 4923 [not summarized] 4924 4925 4926Release data2011h - 2011-06-15 18:41:48 -0400 4927 4928 Russia and Curaçao changes 4929 4930 4931Release 2011g - 2011-04-25 09:07:22 -0400 4932 4933 update the rules for Egypt to reflect its abandonment of DST this year 4934 4935 4936Release 2011f - 2011-04-06 17:14:53 -0400 4937 4938 [not summarized] 4939 4940 4941Release 2011e - 2011-03-31 16:04:38 -0400 4942 4943 Morocco, Chile, and tz-link changes 4944 4945 4946Release 2011d - 2011-03-14 09:18:01 -0400 4947 4948 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4949 4950 4951Release 2011c - 2011-03-07 09:30:09 -0500 4952 4953 These do affect current timestamps in Chile and Annette Island, Canada. 4954 4955 4956Release 2011b - 2011-02-07 08:44:50 -0500 4957 4958 [not summarized] 4959 4960 4961Release 2011a - 2011-01-24 10:30:16 -0500 4962 4963 [not summarized] 4964 4965 4966Release data2010o - 2010-11-01 09:18:23 -0400 4967 4968 change to the end of DST in Fiji in 2011 4969 4970 4971Release 2010n - 2010-10-25 08:19:17 -0400 4972 4973 [not summarized] 4974 4975 4976Release 2010m - 2010-09-27 09:24:48 -0400 4977 4978 Hong Kong, Vostok, and zic.c changes 4979 4980 4981Release 2010l - 2010-08-16 06:57:25 -0400 4982 4983 [not summarized] 4984 4985 4986Release 2010k - 2010-07-26 10:42:27 -0400 4987 4988 [not summarized] 4989 4990 4991Release 2010j - 2010-05-10 09:07:48 -0400 4992 4993 changes for Bahía de Banderas and for version naming 4994 4995 4996Release data2010i - 2010-04-16 18:50:45 -0400 4997 4998 the end of DST in Morocco on 2010-08-08 4999 5000 5001Release data2010h - 2010-04-05 09:58:56 -0400 5002 5003 [not summarized] 5004 5005 5006Release data2010g - 2010-03-24 11:14:53 -0400 5007 5008 [not summarized] 5009 5010 5011Release 2010f - 2010-03-22 09:45:46 -0400 5012 5013 [not summarized] 5014 5015 5016Release data2010e - 2010-03-08 14:24:27 -0500 5017 5018 corrects the Dhaka bug found by Danvin Ruangchan 5019 5020 5021Release data2010d - 2010-03-06 07:26:01 -0500 5022 5023 [not summarized] 5024 5025 5026Release 2010c - 2010-03-01 09:20:58 -0500 5027 5028 changes including KRE's suggestion for earlier initialization of 5029 "goahead" and "goback" structure elements 5030 5031 5032Release code2010a - 2010-02-16 10:40:04 -0500 5033 5034 [not summarized] 5035 5036 5037Release data2010b - 2010-01-20 12:37:01 -0500 5038 5039 Mexico changes 5040 5041 5042Release data2010a - 2010-01-18 08:30:04 -0500 5043 5044 changes to Dhaka 5045 5046 5047Release data2009u - 2009-12-26 08:32:28 -0500 5048 5049 changes to DST in Bangladesh 5050 5051 5052Release 2009t - 2009-12-21 13:24:27 -0500 5053 5054 [not summarized] 5055 5056 5057Release data2009s - 2009-11-14 10:26:32 -0500 5058 5059 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5060 5061 5062Release 2009r - 2009-11-09 10:10:31 -0500 5063 5064 "antarctica" and "tz-link.htm" changes 5065 5066 5067Release 2009q - 2009-11-02 09:12:40 -0500 5068 5069 with two corrections as reported by Eric Muller and Philip Newton 5070 5071 5072Release data2009p - 2009-10-23 15:05:27 -0400 5073 5074 Argentina (including San Luis) changes (with the correction from 5075 Mariano Absatz) 5076 5077 5078Release data2009o - 2009-10-14 16:49:38 -0400 5079 5080 Samoa (commentary only), Pakistan, and Bangladesh changes 5081 5082 5083Release data2009n - 2009-09-22 15:13:38 -0400 5084 5085 added commentary for Argentina and a change to the end of DST in 5086 2009 in Pakistan 5087 5088 5089Release data2009m - 2009-09-03 10:23:43 -0400 5090 5091 Samoa and Palestine changes 5092 5093 5094Release data2009l - 2009-08-14 09:13:07 -0400 5095 5096 Samoa (comments only) and Egypt 5097 5098 5099Release 2009k - 2009-07-20 09:46:08 -0400 5100 5101 [not summarized] 5102 5103 5104Release data2009j - 2009-06-15 06:43:59 -0400 5105 5106 Bangladesh change (with a short turnaround since the DST change is 5107 impending) 5108 5109 5110Release 2009i - 2009-06-08 09:21:22 -0400 5111 5112 updating for DST in Bangladesh this year 5113 5114 5115Release 2009h - 2009-05-26 09:19:14 -0400 5116 5117 [not summarized] 5118 5119 5120Release data2009g - 2009-04-20 16:34:07 -0400 5121 5122 Cairo 5123 5124 5125Release data2009f - 2009-04-10 11:00:52 -0400 5126 5127 correct DST in Pakistan 5128 5129 5130Release 2009e - 2009-04-06 09:08:11 -0400 5131 5132 [not summarized] 5133 5134 5135Release 2009d - 2009-03-23 09:38:12 -0400 5136 5137 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5138 5139 5140Release data2009c - 2009-03-16 09:47:51 -0400 5141 5142 change to the start of Cuban DST 5143 5144 5145Release 2009b - 2009-02-09 11:15:22 -0500 5146 5147 [not summarized] 5148 5149 5150Release 2009a - 2009-01-21 10:09:39 -0500 5151 5152 [not summarized] 5153 5154 5155Release data2008i - 2008-10-21 12:10:25 -0400 5156 5157 southamerica and zone.tab files, with Argentina DST rule changes and 5158 United States zone reordering and recommenting 5159 5160 5161Release 2008h - 2008-10-13 07:33:56 -0400 5162 5163 [not summarized] 5164 5165 5166Release 2008g - 2008-10-06 09:03:18 -0400 5167 5168 Fix a broken HTML anchor and update Brazil's DST transitions; 5169 there's also a slight reordering of information in tz-art.htm. 5170 5171 5172Release data2008f - 2008-09-09 22:33:26 -0400 5173 5174 [not summarized] 5175 5176 5177Release 2008e - 2008-07-28 14:11:17 -0400 5178 5179 changes by Arthur David Olson and Jesper Nørgaard Welen 5180 5181 5182Release data2008d - 2008-07-07 09:51:38 -0400 5183 5184 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5185 5186 5187Release data2008c - 2008-05-19 17:48:03 -0400 5188 5189 Pakistan, Morocco, and Mongolia 5190 5191 5192Release data2008b - 2008-03-24 08:30:59 -0400 5193 5194 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5195 link provided 5196 5197 5198Release 2008a - 2008-03-08 05:42:16 -0500 5199 5200 [not summarized] 5201 5202 5203Release 2007k - 2007-12-31 10:25:22 -0500 5204 5205 most importantly, changes to the "southamerica" file based on 5206 Argentina's readoption of daylight saving time 5207 5208 5209Release 2007j - 2007-12-03 09:51:01 -0500 5210 5211 1. eliminate the "P" (parameter) macro; 5212 5213 2. the "noncontroversial" changes circulated on the time zone 5214 mailing list (less the changes to "logwtmp.c"); 5215 5216 3. eliminate "too many transition" errors when "min" is used in time 5217 zone rules; 5218 5219 4. changes by Paul Eggert (including updated information for Venezuela). 5220 5221 5222Release data2007i - 2007-10-30 10:28:11 -0400 5223 5224 changes for Cuba and Syria 5225 5226 5227Release 2007h - 2007-10-01 10:05:51 -0400 5228 5229 changes by Paul Eggert, as well as an updated link to the ICU 5230 project in tz-link.htm 5231 5232 5233Release 2007g - 2007-08-20 10:47:59 -0400 5234 5235 changes by Paul Eggert 5236 5237 The "leapseconds" file has been updated to incorporate the most 5238 recent International Earth Rotation and Reference Systems Service 5239 (IERS) bulletin. 5240 5241 There's an addition to tz-art.htm regarding the television show "Medium". 5242 5243 5244Release 2007f - 2007-05-07 10:46:46 -0400 5245 5246 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5247 Zealand) 5248 5249 changes to zic.c to allow hour values greater than 24 (along with 5250 Paul's improved time value overflow checking) 5251 5252 5253Release 2007e - 2007-04-02 10:11:52 -0400 5254 5255 Syria and Honduras changes by Paul Eggert 5256 5257 zic.c variable renaming changes by Arthur David Olson 5258 5259 5260Release 2007d - 2007-03-20 08:48:30 -0400 5261 5262 changes by Paul Eggert 5263 5264 the elimination of white space at the ends of lines 5265 5266 5267Release 2007c - 2007-02-26 09:09:37 -0500 5268 5269 changes by Paul Eggert 5270 5271 5272Release 2007b - 2007-02-12 09:34:20 -0500 5273 5274 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5275 5276 changes to the commentary in "leapseconds" reflecting the IERS 5277 announcement that there is to be no positive leap second at the end 5278 of June 2007. 5279 5280 5281Release 2007a - 2007-01-08 12:28:29 -0500 5282 5283 changes by Paul Eggert 5284 5285 Derick Rethans's Asmara change 5286 5287 Oscar van Vlijmen's Easter Island local mean time change 5288 5289 symbolic link changes 5290 5291 5292Release 2006p - 2006-11-27 08:54:27 -0500 5293 5294 changes by Paul Eggert 5295 5296 5297Release 2006o - 2006-11-06 09:18:07 -0500 5298 5299 changes by Paul Eggert 5300 5301 5302Release 2006n - 2006-10-10 11:32:06 -0400 5303 5304 changes by Paul Eggert 5305 5306 5307Release 2006m - 2006-10-02 15:32:35 -0400 5308 5309 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5310 5311 (minimalist) changes to zic.8 to clarify "until" information 5312 5313 5314Release data2006l - 2006-09-18 12:58:11 -0400 5315 5316 Paul's best-effort work on this coming weekend's Egypt time change 5317 5318 5319Release 2006k - 2006-08-28 12:19:09 -0400 5320 5321 changes by Paul Eggert 5322 5323 5324Release 2006j - 2006-08-21 09:56:32 -0400 5325 5326 changes by Paul Eggert 5327 5328 5329Release code2006i - 2006-08-07 12:30:55 -0400 5330 5331 localtime.c fixes 5332 5333 Ken Pizzini's conversion script 5334 5335 5336Release code2006h - 2006-07-24 09:19:37 -0400 5337 5338 adds public domain notices to four files 5339 5340 includes a fix for transition times being off by a second 5341 5342 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5343 5344 5345Release 2006g - 2006-05-08 17:18:09 -0400 5346 5347 northamerica changes by Paul Eggert 5348 5349 5350Release 2006f - 2006-05-01 11:46:00 -0400 5351 5352 a missing version number problem is fixed (with thanks to Bradley 5353 White for catching the problem) 5354 5355 5356Release 2006d - 2006-04-17 14:33:43 -0400 5357 5358 changes by Paul Eggert 5359 5360 added new items to tz-arts.htm that were found by Paul 5361 5362 5363Release 2006c - 2006-04-03 10:09:32 -0400 5364 5365 two sets of data changes by Paul Eggert 5366 5367 a fencepost error fix in zic.c 5368 5369 changes to zic.c and the "europe" file to minimize differences 5370 between output produced by the old 32-bit zic and the new 64-bit 5371 version 5372 5373 5374Release 2006b - 2006-02-20 10:08:18 -0500 5375 [tz32code2006b + tz64code2006b + tzdata2006b] 5376 5377 64-bit code 5378 5379 All SCCS IDs were bumped to "8.1" for this release. 5380 5381 5382Release 2006a - 2006-01-30 08:59:31 -0500 5383 5384 changes by Paul Eggert (in particular, Indiana time zone moves) 5385 5386 an addition to the zic manual page to describe how special-case 5387 transitions are handled 5388 5389 5390Release 2005r - 2005-12-27 09:27:13 -0500 5391 5392 Canadian changes by Paul Eggert 5393 5394 They also add "<pre>" directives to time zone data files and reflect 5395 changes to warning message logic in "zdump.c" (but with calls to 5396 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5397 5398 5399Release 2005q - 2005-12-13 09:17:09 -0500 5400 5401 Nothing earth-shaking here: 5402 1. Electronic mail addresses have been removed. 5403 2. Casts of the return value of exit have been removed. 5404 3. Casts of the argument of is.* macros have been added. 5405 4. Indentation in one section of zic.c has been fixed. 5406 5. References to dead URLs in the data files have been dealt with. 5407 5408 5409Release 2005p - 2005-12-05 10:30:53 -0500 5410 5411 "systemv", "tz-link.htm", and "zdump.c" changes 5412 (less the casts of arguments to the is* macros) 5413 5414 5415Release 2005o - 2005-11-28 10:55:26 -0500 5416 5417 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5418 5419 zdump.c lint fixes by Arthur David Olson 5420 5421 5422Release 2005n - 2005-10-03 09:44:09 -0400 5423 5424 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5425 et al. changes) 5426 5427 5428Release 2005m - 2005-08-29 12:15:40 -0400 5429 5430 changes by Paul Eggert (with a small tweak to the tz-art change) 5431 5432 a declaration of an unused variable has been removed from zdump.c 5433 5434 5435Release 2005l - 2005-08-22 12:06:39 -0400 5436 5437 changes by Paul Eggert 5438 5439 overflow/underflow checks by Arthur David Olson, minus changes to 5440 the "Theory" file about the pending addition of 64-bit data (I grow 5441 less confident of the changes being accepted with each passing day, 5442 and the changes no longer increase the data files nine-fold--there's 5443 less than a doubling in size by my local Sun's reckoning) 5444 5445 5446Release 2005k - 2005-07-14 14:14:24 -0400 5447 5448 The "leapseconds" file has been edited to reflect the recently 5449 announced leap second at the end of 2005. 5450 5451 I've also deleted electronic mail addresses from the files as an 5452 anti-spam measure. 5453 5454 5455Release 2005j - 2005-06-13 14:34:13 -0400 5456 5457 These reflect changes to limit the length of time zone abbreviations 5458 and the characters used in those abbreviations. 5459 5460 There are also changes to handle POSIX-style "quoted" timezone 5461 environment variables. 5462 5463 The changes were circulated on the time zone mailing list; the only 5464 change since then was the removal of a couple of minimum-length of 5465 abbreviation checks. 5466 5467 5468Release data2005i - 2005-04-21 15:04:16 -0400 5469 5470 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5471 5472 5473Release 2005h - 2005-04-04 11:24:47 -0400 5474 5475 changes by Paul Eggert 5476 5477 minor changes to Makefile and zdump.c to produce more useful output 5478 when doing a "make typecheck" 5479 5480 5481Release 2005g - 2005-03-14 10:11:21 -0500 5482 5483 changes by Paul Eggert (a change to current DST rules in Uruguay and 5484 an update to a link to time zone software) 5485 5486 5487Release 2005f - 2005-03-01 08:45:32 -0500 5488 5489 data and documentation changes by Paul Eggert 5490 5491 5492Release 2005e - 2005-02-10 15:59:44 -0500 5493 5494 [not summarized] 5495 5496 5497Release code2005d - 2005-01-31 09:21:47 -0500 5498 5499 make zic complain about links to links if the -v flag is used 5500 5501 have "make public" do more code checking 5502 5503 add an include to "localtime.c" for the benefit of gcc systems 5504 5505 5506Release 2005c - 2005-01-17 18:36:29 -0500 5507 5508 get better results when mktime runs on a system where time_t is double 5509 5510 changes to the data files (most importantly to Paraguay) 5511 5512 5513Release 2005b - 2005-01-10 09:19:54 -0500 5514 5515 Get localtime and gmtime working on systems with exotic time_t types. 5516 5517 Update the leap second commentary in the "leapseconds" file. 5518 5519 5520Release 2005a - 2005-01-01 13:13:44 -0500 5521 5522 [not summarized] 5523 5524 5525Release code2004i - 2004-12-14 13:42:58 -0500 5526 5527 Deal with systems where time_t is unsigned. 5528 5529 5530Release code2004h - 2004-12-07 11:40:18 -0500 5531 5532 64-bit-time_t changes 5533 5534 5535Release 2004g - 2004-11-02 09:06:01 -0500 5536 5537 update to Cuba (taking effect this weekend) 5538 5539 other changes by Paul Eggert 5540 5541 correction of the spelling of Oslo 5542 5543 changed versions of difftime.c and private.h 5544 5545 5546Release code2004f - 2004-10-21 10:25:22 -0400 5547 5548 Cope with wide-ranging tm_year values. 5549 5550 5551Release 2004e - 2004-10-11 14:47:21 -0400 5552 5553 Brazil/Argentina/Israel changes by Paul Eggert 5554 5555 changes to tz-link.htm by Paul 5556 5557 one small fix to Makefile 5558 5559 5560Release 2004d - 2004-09-22 08:27:29 -0400 5561 5562 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5563 5564 5565Release 2004c - 2004-08-11 12:06:26 -0400 5566 5567 asctime-related changes 5568 5569 (variants of) some of the documentation changes suggested by Paul Eggert 5570 5571 5572Release 2004b - 2004-07-19 14:33:35 -0400 5573 5574 data changes by Paul Eggert - most importantly, updates for Argentina 5575 5576 5577Release 2004a - 2004-05-27 12:00:47 -0400 5578 5579 changes by Paul Eggert 5580 5581 Handle DST transitions that occur at the end of a month in some 5582 years but at the start of the following month in other years. 5583 5584 Add a copy of the correspondence that's the basis for claims about 5585 DST in the Navajo Nation. 5586 5587 5588Release 2003e - 2003-12-15 09:36:47 -0500 5589 5590 changes by Arthur David Olson (primarily code changes) 5591 5592 changes by Paul Eggert (primarily data changes) 5593 5594 minor changes to "Makefile" and "northamerica" (in the latter case, 5595 optimization of the "Toronto" rules) 5596 5597 5598Release 2003d - 2003-10-06 09:34:44 -0400 5599 5600 changes by Paul Eggert 5601 5602 5603Release 2003c - 2003-09-16 10:47:05 -0400 5604 5605 Fix bad returns in zic.c's inleap function. 5606 Thanks to Bradley White for catching the problem! 5607 5608 5609Release 2003b - 2003-09-16 07:13:44 -0400 5610 5611 Add a "--version" option (and documentation) to the zic and zdump commands. 5612 5613 changes to overflow/underflow checking in zic 5614 5615 a localtime typo fix. 5616 5617 Update the leapseconds and tz-art.htm files. 5618 5619 5620Release 2003a - 2003-03-24 09:30:54 -0500 5621 5622 changes by Paul Eggert 5623 5624 a few additions and modifications to the tz-art.htm file 5625 5626 5627Release 2002d - 2002-10-15 13:12:42 -0400 5628 5629 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5630 5631 There's also a new time zone quote in "tz-art.htm". 5632 5633 5634Release 2002c - 2002-04-04 11:55:20 -0500 5635 5636 changes by Paul Eggert 5637 5638 Change zic.c to avoid creating symlinks to files that don't exist. 5639 5640 5641Release 2002b - 2002-01-28 12:56:03 -0500 5642 5643 [These change notes are for Release 2002a, which was corrupted. 5644 2002b was a corrected version of 2002a.] 5645 5646 changes by Paul Eggert 5647 5648 Update the "leapseconds" file to note that there'll be no leap 5649 second at the end of June, 2002. 5650 5651 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5652 5653 Change to "difftime.c" to avoid sizeof problems. 5654 5655 5656Release 2001d - 2001-10-09 13:31:32 -0400 5657 5658 changes by Paul Eggert 5659 5660 5661Release 2001c - 2001-06-05 13:59:55 -0400 5662 5663 changes by Paul Eggert and Andrew Brown 5664 5665 5666Release 2001b - 2001-04-05 16:44:38 -0400 5667 5668 changes by Paul Eggert (modulo jnorgard's typo fix) 5669 5670 tz-art.htm has been HTMLified. 5671 5672 5673Release 2001a - 2001-03-13 12:57:44 -0500 5674 5675 changes by Paul Eggert 5676 5677 An addition to the "leapseconds" file: comments with the text of the 5678 latest IERS leap second notice. 5679 5680 Trailing white space has been removed from data file lines, and 5681 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5682 converted to tabs. 5683 5684 5685Release 2000h - 2000-12-14 15:33:38 -0500 5686 5687 changes by Paul Eggert 5688 5689 one typo fix in the "art" file 5690 5691 With providence, this is the last update of the millennium. 5692 5693 5694Release 2000g - 2000-10-10 11:35:22 -0400 5695 5696 changes by Paul Eggert 5697 5698 correction of John Mackin's name submitted by Robert Elz 5699 5700 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5701 Emmy Awards broadcast. 5702 5703 5704Release 2000f - 2000-08-10 09:31:58 -0400 5705 5706 changes by Paul Eggert 5707 5708 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5709 5710 Error checking and messages in the "yearistype" script have been 5711 improved. 5712 5713 5714Release 2000e - 2000-07-31 09:27:54 -0400 5715 5716 data changes by Paul Eggert 5717 5718 a change to the default value of the defined constant HAVE_STRERROR 5719 5720 the addition of a Dave Barry quote on DST to the tz-arts file 5721 5722 5723Release 2000d - 2000-04-20 15:43:04 -0400 5724 5725 changes to the documentation and code of strftime for C99 conformance 5726 5727 a bug fix for date.c 5728 5729 These are based on (though modified from) changes by Paul Eggert. 5730 5731 5732Release 2000c - 2000-03-04 10:31:43 -0500 5733 5734 changes by Paul Eggert 5735 5736 5737Release 2000b - 2000-02-21 12:16:29 -0500 5738 5739 changes by Paul Eggert and Joseph Myers 5740 5741 modest tweaks to the tz-art.htm and tz-link.htm files 5742 5743 5744Release 2000a - 2000-01-18 09:21:26 -0500 5745 5746 changes by Paul Eggert 5747 5748 The two hypertext documents have also been renamed. 5749 5750 5751Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5752 5753 Paul Eggert's changes 5754 5755 additions to the "zic" manual page and the "Arts.htm" file 5756 5757 5758Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5759 5760 [not summarized] 5761 5762 5763Release data1999h - 1999-10-07 03:50:29 -0400 5764 5765 changes by Paul Eggert to "europe" (most importantly, fixing 5766 Lithuania and Estonia) 5767 5768 5769Release 1999g - 1999-09-28 11:06:18 -0400 5770 5771 data changes by Paul Eggert (most importantly, the change for 5772 Lebanon that buys correctness for this coming Sunday) 5773 5774 The "code" file contains changes to "Makefile" and "checktab.awk" to 5775 allow better checking of time zone files before they are published. 5776 5777 5778Release 1999f - 1999-09-23 09:48:14 -0400 5779 5780 changes by Arthur David Olson and Paul Eggert 5781 5782 5783Release 1999e - 1999-08-17 15:20:54 -0400 5784 5785 changes circulated by Paul Eggert, although the change to handling 5786 of DST-specifying timezone names has been commented out for now 5787 (search for "XXX" in "localtime.c" for details). These files also 5788 do not make any changes to the start of DST in Brazil. 5789 5790 In addition to Paul's changes, there are updates to "Arts.htm" and 5791 cleanups of URLs. 5792 5793 5794Release 1999d - 1999-03-30 11:31:07 -0500 5795 5796 changes by Paul Eggert 5797 5798 The Makefile's "make public" rule has also been changed to do a test 5799 compile of each individual time zone data file (which should help 5800 avoid problems such as the one we had with Nicosia). 5801 5802 5803Release 1999c - 1999-03-25 09:47:47 -0500 5804 5805 changes by Paul Eggert, most importantly the change for Chile. 5806 5807 5808Release 1999b - 1999-02-01 17:51:44 -0500 5809 5810 changes by Paul Eggert 5811 5812 code changes (suggested by Mani Varadarajan, mani at be.com) for 5813 correct handling of symbolic links when building using a relative directory 5814 5815 code changes to generate correct messages for failed links 5816 5817 updates to the URLs in Arts.htm 5818 5819 5820Release 1999a - 1999-01-19 16:20:29 -0500 5821 5822 error message internationalizations and corrections in zic.c and 5823 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5824 to whom thanks!) 5825 5826 5827Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5828 5829 changes for Brazil, Chile, and Germany 5830 5831 support for use of "24:00" in the input files for the time zone compiler 5832 5833 5834Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5835 5836 changes by Paul Eggert 5837 5838 correction to a define in the "private.h" file 5839 5840 5841Release data1998g - 1998-08-11 03:28:35 -0000 5842 [tzdata1998g.tar.gz is missing!] 5843 5844 Lithuanian change provided by mgedmin at pub.osf.it 5845 5846 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5847 "backward") to ensure that the GMT file is created even where folks 5848 don't want the "backward" links (as suggested by Paul Eggert). 5849 5850 5851Release data1998f - 1998-07-20 13:50:00 -0000 5852 [tzdata1998f.tar.gz is missing!] 5853 5854 Update the "leapseconds" file to include the newly announced 5855 insertion at the end of 1998. 5856 5857 5858Release code1998f - 1998-06-01 10:18:31 -0400 5859 5860 addition to localtime.c by Guy Harris 5861 5862 5863Release 1998e - 1998-05-28 09:56:26 -0400 5864 5865 The Makefile is changed to produce zoneinfo-posix rather than 5866 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5867 zoneinfo/right. 5868 5869 data changes by Paul Eggert 5870 5871 changes from Guy Harris to provide asctime_r and ctime_r 5872 5873 A usno1998 file (substantially identical to usno1997) has been added. 5874 5875 5876Release 1998d - 1998-05-14 11:58:34 -0400 5877 5878 changes to comments (in particular, elimination of references to CIA maps). 5879 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5880 where changes occur. 5881 5882 5883Release 1998c - 1998-02-28 12:32:26 -0500 5884 5885 changes by Paul Eggert (save the "French correction," on which I'll 5886 wait for the dust to settle) 5887 5888 symlink changes 5889 5890 changes and additions to Arts.htm 5891 5892 5893Release 1998b - 1998-01-17 14:31:51 -0500 5894 5895 URL cleanups and additions 5896 5897 5898Release 1998a - 1998-01-13 12:37:35 -0500 5899 5900 changes by Paul Eggert 5901 5902 5903Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5904 5905 changes by Paul Eggert, with minor modifications from Arthur David 5906 Olson to make the files more browser friendly 5907 5908 5909Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5910 5911 minor changes to put "TZif" at the start of each timezone information file 5912 5913 a rule has also been added to the Makefile so you can 5914 make zones 5915 to just recompile the zone information files (rather than doing a 5916 full "make install" with its other effects). 5917 5918 5919Release data1997i - 1997-10-07 08:45:38 -0400 5920 5921 changes to Africa by Paul Eggert 5922 5923 5924Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5925 5926 corrections for Uruguay (and other locations) 5927 5928 Arthur David Olson's simple-minded fix allowing mktime to both 5929 correctly handle leap seconds and correctly handle tm_sec values 5930 upon which arithmetic has been performed. 5931 5932 5933Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5934 5935 Paul Eggert's updates 5936 5937 a small change to a function prototype; 5938 5939 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5940 include information on Around the World in Eighty Days. 5941 5942 5943Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5944 5945 fixes to zic's error handling 5946 5947 changes inspired by the item circulated on Slovenia 5948 5949 The description of Web resources has been HTMLified for browsing 5950 convenience. 5951 5952 A new piece of tz-related music has been added to the "Music" file. 5953 5954 5955Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5956 5957 Paul Eggert's latest suggestions 5958 5959 5960Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5961 5962 changes to "zic.c" to correct performance of the "-s" option 5963 5964 a new file "usno1997" 5965 5966 5967Release data1997c - 1997-03-04 09:58:18 -0500 5968 5969 changes in Israel 5970 5971 5972Release 1997b - 1997-02-27 18:34:19 -0500 5973 5974 The data file incorporates the 1997 leap second. 5975 5976 The code file incorporates Arthur David Olson's take on the 5977 zic/multiprocessor/directory-creation situation. 5978 5979 5980Release 1997a - 1997-01-21 09:11:10 -0500 5981 5982 Paul Eggert's Antarctica (and other changes) 5983 5984 Arthur David Olson finessed the "getopt" issue by checking against 5985 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5986 is returned while SunOS 5.5's manual says EOF is returned). 5987 5988 5989Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5990 5991 Paul Eggert's latest changes 5992 5993 5994Release code1996n - 1996-12-16 09:42:02 -0500 5995 5996 link snapping fix from Bruce Evans (via Garrett Wollman) 5997 5998 5999Release data1996m - 1996-11-24 02:37:34 -0000 6000 [tzdata1996m.tar.gz is missing!] 6001 6002 Paul Eggert's batch of changes 6003 6004 6005Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 6006 6007 No functional changes here; the files have simply been changed to 6008 make more use of ISO style dates in comments. The names of the above 6009 files now include the year in full. 6010 6011 6012Release code96l - 1996-09-08 17:12:20 -0400 6013 6014 tzcode96k was missing a couple of pieces. 6015 6016 6017Release 96k - 1996-09-08 16:06:22 -0400 6018 6019 the latest round of changes from Paul Eggert 6020 6021 the recent Year 2000 material 6022 6023 6024Release code96j - 1996-07-30 13:18:53 -0400 6025 6026 Set sp->typecnt as suggested by Timothy Patrick Murphy. 6027 6028 6029Release code96i - 1996-07-27 20:11:35 -0400 6030 6031 Paul's suggested patch for strftime %V week numbers 6032 6033 6034Release data96i - 1996-07-01 18:13:04 -0400 6035 6036 "northamerica" and "europe" changes by Paul Eggert 6037 6038 6039Release code96h - 1996-06-05 08:02:21 -0400 6040 6041 fix for handling transitions specified in Universal Time 6042 6043 Some "public domain" notices have also been added. 6044 6045 6046Release code96g - 1996-05-16 14:00:26 -0400 6047 6048 fix for the simultaneous-DST-and-zone-change challenge 6049 6050 6051Release data96h - 1996-05-09 17:40:51 -0400 6052 6053 changes by Paul Eggert 6054 6055 6056Release code96f-data96g - 1996-05-03 03:09:59 -0000 6057 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6058 6059 The changes get us some of the way to fixing the problems noted in Paul 6060 Eggert's letter yesterday (in addition to a few others). The approach 6061 has been to make zic a bit smarter about figuring out what time zone 6062 abbreviations apply just after the time specified in the "UNTIL" part 6063 of a zone line. Putting the smarts in zic means avoiding having 6064 transition times show up in both "Zone" lines and "Rule" lines, which 6065 in turn avoids multiple transition time entries in time zone files. 6066 (This also makes the zic input files such as "europe" a bit shorter and 6067 should ease maintenance.) 6068 6069 6070Release data96f - 1996-04-19 19:20:03 -0000 6071 [tzdata96f.tar.gz is missing!] 6072 6073 The only changes are to the "northamerica" file; the time zone 6074 abbreviation for Denver is corrected to MST (and MDT), and the 6075 comments for Mexico have been updated. 6076 6077 6078Release data96e - 1996-03-19 17:37:26 -0500 6079 6080 Proposals by Paul Eggert, in particular the Portugal change that 6081 comes into play at the end of this month. 6082 6083 6084Release data96d - 1996-03-18 20:49:39 -0500 6085 6086 [not summarized] 6087 6088 6089Release code96e - 1996-02-29 15:43:27 -0000 6090 [tzcode96e.tar.gz is missing!] 6091 6092 internationalization changes and the fix to the documentation for strftime 6093 6094 6095Release code96d-data96c - 1996-02-12 11:05:27 -0500 6096 6097 The "code" file simply updates Bob Kridle's electronic address. 6098 6099 The "data" file updates rules for Mexico. 6100 6101 6102Release data96b - 1996-01-27 15:44:42 -0500 6103 6104 Kiribati change 6105 6106 6107Release code96c - 1996-01-16 16:58:15 -0500 6108 6109 leap-year streamlining and binary-search changes 6110 6111 fix to newctime.3 6112 6113 6114Release code96b - 1996-01-10 20:42:39 -0500 6115 6116 fixes and enhancements from Paul Eggert, including code that 6117 emulates the behavior of recent versions of the SunOS "date" 6118 command. 6119 6120 6121Release 96a - 1996-01-06 09:08:24 -0500 6122 6123 Israel updates 6124 6125 fixes to strftime.c for correct ISO 8601 week number generation, 6126 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6127 numbers (which are not necessarily the same as calendar year numbers) 6128 6129 6130Release code95i-data95m - 1995-12-21 12:46:47 -0500 6131 6132 The latest revisions from Paul Eggert are included, the usno1995 6133 file has been updated, and a new file ("WWW") covering useful URLs 6134 has been added. 6135 6136 6137Release code95h-data95l - 1995-12-19 18:10:12 -0500 6138 6139 A simplification of a macro definition, a change to data for Sudan, 6140 and (for last minute shoppers) notes in the "Music" file on the CD 6141 "Old Man Time". 6142 6143 6144Release code95g-data95k - 1995-10-30 10:32:47 -0500 6145 6146 (slightly reformatted) 8-bit-clean proposed patch 6147 6148 minor patch: US/Eastern -> America/New_York 6149 6150 snapshot of the USNO's latest data ("usno1995") 6151 6152 some other minor cleanups 6153 6154 6155Release code95f-data95j - 1995-10-28 21:01:34 -0000 6156 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6157 6158 European cleanups 6159 6160 support for 64-bit time_t's 6161 6162 optimization in localtime.c 6163 6164 6165Release code95e - 1995-10-13 13:23:57 -0400 6166 6167 the mktime change to scan from future to past when trying to find time zone 6168 offsets 6169 6170 6171Release data95i - 1995-09-26 10:43:26 -0400 6172 6173 For Canada/Central, guess that the Sun customer's "one week too 6174 early" was just a approximation, and the true error is one month 6175 too early. This is consistent with the rest of Canada. 6176 6177 6178Release data95h - 1995-09-21 11:26:48 -0400 6179 6180 latest changes from Paul Eggert 6181 6182 6183Release code95d - 1995-09-14 11:14:45 -0400 6184 6185 the addition of a "Music" file, which documents four recorded 6186 versions of the tune "Save That Time". 6187 6188 6189Release data95g - 1995-09-01 17:21:36 -0400 6190 6191 "yearistype" correction 6192 6193 6194Release data95f - 1995-08-28 20:46:56 -0400 6195 6196 Paul Eggert's change to the australasia file 6197 6198 6199Release data95e - 1995-07-08 18:02:34 -0400 6200 6201 The only change is a leap second at the end of this year. 6202 Thanks to Bradley White for forwarding news on the leap second. 6203 6204 6205Release data95d - 1995-07-03 13:26:22 -0400 6206 6207 Paul Eggert's changes 6208 6209 6210Release data95c - 1995-07-02 19:19:28 -0400 6211 6212 changes to "asia", "backward", "europe", and "southamerica" 6213 (read: northamericacentrics need not apply) 6214 6215 6216Release code95c - 1995-03-13 14:00:46 -0500 6217 6218 one-line fix for sign extension problems in detzcode 6219 6220 6221Release 95b - 1995-03-04 11:22:38 -0500 6222 6223 Minor changes in both: 6224 6225 The "code" file contains a workaround for the lack of "unistd.h" in 6226 Microsoft C++ version 7. 6227 6228 The "data" file contains a fixed "Link" for America/Shiprock. 6229 6230 6231Release 94h - 1994-12-10 12:51:14 -0500 6232 6233 The files: 6234 6235 * incorporate the changes to "zdump" and "date" to make changes to 6236 the "TZ" environment variable permanent; 6237 6238 * incorporate the table changes by Paul Eggert; 6239 6240 * include (and document) support for universal time specifications in 6241 data files - but do not (yet) include use of this feature in the 6242 data files. 6243 6244 Think of this as "TZ Classic" - the software has been set up not to break if 6245 universal time shows up in its input, and data entries have been 6246 left as is so as not to break existing implementations. 6247 6248 6249Release data94f - 1994-08-20 12:56:09 -0400 6250 6251 (with thanks!) the latest data updates from Paul Eggert 6252 6253 6254Release data94e - 1994-06-04 13:13:53 -0400 6255 6256 [not summarized] 6257 6258 6259Release code94g - 1994-05-05 12:14:07 -0400 6260 6261 fix missing "optind.c" and a reference to it in the Makefile 6262 6263 6264Release code94f - 1994-05-05 13:00:33 -0000 6265 [tzcode94f.tar.gz is missing!] 6266 6267 changes to avoid overflow in difftime, as well as changes to cope 6268 with the 52/53 challenge in strftime 6269 6270 6271Release code94e - 1994-03-30 23:32:59 -0500 6272 6273 change for the benefit of PCTS 6274 6275 6276Release 94d - 1994-02-24 15:42:25 -0500 6277 6278 Avoid clashes with POSIX semantics for zones such as GMT+4. 6279 6280 Some other very minor housekeeping is also present. 6281 6282 6283Release code94c - 1994-02-10 08:52:40 -0500 6284 6285 Fix bug where mkdirs was broken unless you compile with 6286 -fwritable-strings (which is generally losing to do). 6287 6288 6289Release 94b - 1994-02-07 10:04:33 -0500 6290 6291 work by Paul Eggert who notes: 6292 6293 I found another book of time zone histories by E W Whitman; it's not 6294 as extensive as Shanks but has a few goodies of its own. I used it 6295 to update the tables. I also fixed some more as a result of 6296 correspondence with Adam David and Peter Ilieve, and move some stray 6297 links from 'europe' to 'backward'. I corrected some scanning errors 6298 in usno1989. 6299 6300 As far as the code goes, I fixed zic to allow years in the range 6301 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6302 And I cleaned up the zic documentation a little bit. 6303 6304 6305Release data94a - 1994-02-03 08:58:54 -0500 6306 6307 It simply incorporates the recently announced leap second into the 6308 "leapseconds" file. 6309 6310 6311Release 93g - 1993-11-22 17:28:27 -0500 6312 6313 Paul Eggert has provided a good deal of historic information (based 6314 on Shanks), and there are some code changes to deal with the buglets 6315 that crawled out in dealing with the new information. 6316 6317 6318Release 93f - 1993-10-15 12:27:46 -0400 6319 6320 Paul Eggert's changes 6321 6322 6323Release 93e - 1993-09-05 21:21:44 -0400 6324 6325 This has updated data for Israel, England, and Kwajalein. There's 6326 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6327 Thanks to Paul Eggert and Peter Ilieve for the changes. 6328 6329 6330Release 93d - 1993-06-17 23:34:17 -0400 6331 6332 new fix and new data on Israel 6333 6334 6335Release 93c - 1993-06-06 19:31:55 -0400 6336 6337 [not summarized] 6338 6339 6340Release 93b - 1993-02-02 14:53:58 -0500 6341 6342 updated "leapseconds" file 6343 6344 6345Release 93 - 1993-01-08 07:01:06 -0500 6346 6347 At kre's suggestion, the package has been split in two - a code piece 6348 (which also includes documentation) that's only of use to folks who 6349 want to recompile things and a data piece useful to anyone who can 6350 run "zic". 6351 6352 The new version has a few changes to the data files, a few 6353 portability changes, and an off-by-one fix (with thanks to 6354 Tom Karzes at deshaw.com for providing a description and a 6355 solution). 6356 6357 6358Release 92c - 1992-11-21 17:35:36 -0000 6359 [tz92c.tar.Z is missing!] 6360 6361 The fallout from the latest round of DST transitions. 6362 6363 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6364 there's also a change to "zic.c" that makes it portable to more systems. 6365 6366 6367Release 92 - 1992-04-25 18:17:03 -0000 6368 [tz92.tar.Z is missing!] 6369 6370 By popular demand (well, at any rate, following a request by kre at munnari) 6371 6372 6373The 1989 update of the time zone package featured: 6374 6375 * POSIXization (including interpretation of POSIX-style TZ environment 6376 variables, provided by Guy Harris), 6377 * ANSIfication (including versions of "mktime" and "difftime"), 6378 * SVIDulation (an "altzone" variable) 6379 * MACHination (the "gtime" function) 6380 * corrections to some time zone data (including corrections to the rules 6381 for Great Britain and New Zealand) 6382 * reference data from the United States Naval Observatory for folks who 6383 want to do additional time zones 6384 * and the 1989 data for Saudi Arabia. 6385 6386 (Since this code will be treated as "part of the implementation" in some 6387 places and as "part of the application" in others, there's no good way to 6388 name functions, such as timegm, that are not part of the proposed ANSI C 6389 standard; such functions have kept their old, underscore-free names in this 6390 update.) 6391 6392 And the "dysize" function has disappeared; it was present to allow 6393 compilation of the "date" command on old BSD systems, and a version of "date" 6394 is now provided in the package. The "date" command is not created when you 6395 "make all" since it may lack options provided by the version distributed with 6396 your operating system, or may not interact with the system in the same way 6397 the native version does. 6398 6399 Since POSIX frowns on correct leap second handling, the default behavior of 6400 the "zic" command (in the absence of a "-L" option) has been changed to omit 6401 leap second information from its output files. 6402 6403 6404----- 6405Notes 6406 6407This file contains copies of the part of each release announcement 6408that talks about the changes in that release. The text has been 6409adapted and reformatted for the purposes of this file. 6410 6411Traditionally a release R consists of a pair of tarball files, 6412tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6413code2010a, data2012c) consist of just one or the other tarball, and a 6414few (e.g., code2012c-data2012d) have tarballs with mixed version 6415numbers. Recent releases also come in an experimental format 6416consisting of a single tarball tzdb-R.tar.lz with extra data. 6417 6418Release timestamps are taken from the release's commit (for newer, 6419Git-based releases), from the newest file in the tarball (for older 6420releases, where this info is available) or from the email announcing 6421the release (if all else fails; these are marked with a time zone 6422abbreviation of -0000 and an "is missing!" comment). 6423 6424Earlier versions of the code and data were not announced on the tz 6425list and are not summarized here. 6426 6427This file is in the public domain. 6428 6429Local Variables: 6430coding: utf-8 6431End: 6432