1 /*
2 ********************************************************************************
3 * Copyright (C) 1997-2007, International Business Machines *
4 * Corporation and others. All Rights Reserved. *
5 ********************************************************************************
6 *
7 * File SIMPLETZ.H
8 *
9 * Modification History:
10 *
11 * Date Name Description
12 * 04/21/97 aliu Overhauled header.
13 * 08/10/98 stephen JDK 1.2 sync
14 * Added setStartRule() / setEndRule() overloads
15 * Added hasSameRules()
16 * 09/02/98 stephen Added getOffset(monthLen)
17 * Changed getOffset() to take UErrorCode
18 * 07/09/99 stephen Removed millisPerHour (unused, for HP compiler)
19 * 12/02/99 aliu Added TimeMode and constructor and setStart/EndRule
20 * methods that take TimeMode. Added to docs.
21 ********************************************************************************
22 */
23
24 #ifndef SIMPLETZ_H
25 #define SIMPLETZ_H
26
27 #include "unicode/utypes.h"
28
29 /**
30 * \file
31 * \brief C++ API: SimpleTimeZone is a concrete subclass of TimeZone.
32 */
33
34 #if !UCONFIG_NO_FORMATTING
35
36 #include "unicode/basictz.h"
37
38 U_NAMESPACE_BEGIN
39
40 // forward declaration
41 class InitialTimeZoneRule;
42 class TimeZoneTransition;
43 class AnnualTimeZoneRule;
44
45 /**
46 * <code>SimpleTimeZone</code> is a concrete subclass of <code>TimeZone</code>
47 * that represents a time zone for use with a Gregorian calendar. This
48 * class does not handle historical changes.
49 * <P>
50 * When specifying daylight-savings-time begin and end dates, use a negative value for
51 * <code>dayOfWeekInMonth</code> to indicate that <code>SimpleTimeZone</code> should
52 * count from the end of the month backwards. For example, in the U.S., Daylight Savings
53 * Time ends at the last (dayOfWeekInMonth = -1) Sunday in October, at 2 AM in standard
54 * time.
55 *
56 * @see Calendar
57 * @see GregorianCalendar
58 * @see TimeZone
59 * @author D. Goldsmith, Mark Davis, Chen-Lieh Huang, Alan Liu
60 */
61 class U_I18N_API SimpleTimeZone: public BasicTimeZone {
62 public:
63
64 /**
65 * TimeMode is used, together with a millisecond offset after
66 * midnight, to specify a rule transition time. Most rules
67 * transition at a local wall time, that is, according to the
68 * current time in effect, either standard, or DST. However, some
69 * rules transition at local standard time, and some at a specific
70 * UTC time. Although it might seem that all times could be
71 * converted to wall time, thus eliminating the need for this
72 * parameter, this is not the case.
73 * @stable ICU 2.0
74 */
75 enum TimeMode {
76 WALL_TIME = 0,
77 STANDARD_TIME,
78 UTC_TIME
79 };
80
81 /**
82 * Copy constructor
83 * @param source the object to be copied.
84 * @stable ICU 2.0
85 */
86 SimpleTimeZone(const SimpleTimeZone& source);
87
88 /**
89 * Default assignment operator
90 * @param right the object to be copied.
91 * @stable ICU 2.0
92 */
93 SimpleTimeZone& operator=(const SimpleTimeZone& right);
94
95 /**
96 * Destructor
97 * @stable ICU 2.0
98 */
99 virtual ~SimpleTimeZone();
100
101 /**
102 * Returns true if the two TimeZone objects are equal; that is, they have
103 * the same ID, raw GMT offset, and DST rules.
104 *
105 * @param that The SimpleTimeZone object to be compared with.
106 * @return True if the given time zone is equal to this time zone; false
107 * otherwise.
108 * @stable ICU 2.0
109 */
110 virtual UBool operator==(const TimeZone& that) const;
111
112 /**
113 * Constructs a SimpleTimeZone with the given raw GMT offset and time zone ID,
114 * and which doesn't observe daylight savings time. Normally you should use
115 * TimeZone::createInstance() to create a TimeZone instead of creating a
116 * SimpleTimeZone directly with this constructor.
117 *
118 * @param rawOffsetGMT The given base time zone offset to GMT.
119 * @param ID The timezone ID which is obtained from
120 * TimeZone.getAvailableIDs.
121 * @stable ICU 2.0
122 */
123 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID);
124
125 /**
126 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
127 * and times to start and end daylight savings time. To create a TimeZone that
128 * doesn't observe daylight savings time, don't use this constructor; use
129 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
130 * TimeZone.createInstance() to create a TimeZone instead of creating a
131 * SimpleTimeZone directly with this constructor.
132 * <P>
133 * Various types of daylight-savings time rules can be specfied by using different
134 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
135 * complete explanation of how these parameters work, see the documentation for
136 * setStartRule().
137 *
138 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
139 * @param ID The new SimpleTimeZone's time zone ID.
140 * @param savingsStartMonth The daylight savings starting month. Month is
141 * 0-based. eg, 0 for January.
142 * @param savingsStartDayOfWeekInMonth The daylight savings starting
143 * day-of-week-in-month. See setStartRule() for a
144 * complete explanation.
145 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
146 * See setStartRule() for a complete explanation.
147 * @param savingsStartTime The daylight savings starting time, expressed as the
148 * number of milliseconds after midnight.
149 * @param savingsEndMonth The daylight savings ending month. Month is
150 * 0-based. eg, 0 for January.
151 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
152 * See setStartRule() for a complete explanation.
153 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
154 * See setStartRule() for a complete explanation.
155 * @param savingsEndTime The daylight savings ending time, expressed as the
156 * number of milliseconds after midnight.
157 * @param status An UErrorCode to receive the status.
158 * @stable ICU 2.0
159 */
160 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
161 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
162 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
163 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
164 int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
165 UErrorCode& status);
166 /**
167 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
168 * and times to start and end daylight savings time. To create a TimeZone that
169 * doesn't observe daylight savings time, don't use this constructor; use
170 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
171 * TimeZone.createInstance() to create a TimeZone instead of creating a
172 * SimpleTimeZone directly with this constructor.
173 * <P>
174 * Various types of daylight-savings time rules can be specfied by using different
175 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
176 * complete explanation of how these parameters work, see the documentation for
177 * setStartRule().
178 *
179 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
180 * @param ID The new SimpleTimeZone's time zone ID.
181 * @param savingsStartMonth The daylight savings starting month. Month is
182 * 0-based. eg, 0 for January.
183 * @param savingsStartDayOfWeekInMonth The daylight savings starting
184 * day-of-week-in-month. See setStartRule() for a
185 * complete explanation.
186 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
187 * See setStartRule() for a complete explanation.
188 * @param savingsStartTime The daylight savings starting time, expressed as the
189 * number of milliseconds after midnight.
190 * @param savingsEndMonth The daylight savings ending month. Month is
191 * 0-based. eg, 0 for January.
192 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
193 * See setStartRule() for a complete explanation.
194 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
195 * See setStartRule() for a complete explanation.
196 * @param savingsEndTime The daylight savings ending time, expressed as the
197 * number of milliseconds after midnight.
198 * @param savingsDST The number of milliseconds added to standard time
199 * to get DST time. Default is one hour.
200 * @param status An UErrorCode to receive the status.
201 * @stable ICU 2.0
202 */
203 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
204 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
205 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
206 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
207 int8_t savingsEndDayOfWeek, int32_t savingsEndTime,
208 int32_t savingsDST, UErrorCode& status);
209
210 /**
211 * Construct a SimpleTimeZone with the given raw GMT offset, time zone ID,
212 * and times to start and end daylight savings time. To create a TimeZone that
213 * doesn't observe daylight savings time, don't use this constructor; use
214 * SimpleTimeZone(rawOffset, ID) instead. Normally, you should use
215 * TimeZone.createInstance() to create a TimeZone instead of creating a
216 * SimpleTimeZone directly with this constructor.
217 * <P>
218 * Various types of daylight-savings time rules can be specfied by using different
219 * values for startDay and startDayOfWeek and endDay and endDayOfWeek. For a
220 * complete explanation of how these parameters work, see the documentation for
221 * setStartRule().
222 *
223 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
224 * @param ID The new SimpleTimeZone's time zone ID.
225 * @param savingsStartMonth The daylight savings starting month. Month is
226 * 0-based. eg, 0 for January.
227 * @param savingsStartDayOfWeekInMonth The daylight savings starting
228 * day-of-week-in-month. See setStartRule() for a
229 * complete explanation.
230 * @param savingsStartDayOfWeek The daylight savings starting day-of-week.
231 * See setStartRule() for a complete explanation.
232 * @param savingsStartTime The daylight savings starting time, expressed as the
233 * number of milliseconds after midnight.
234 * @param savingsStartTimeMode Whether the start time is local wall time, local
235 * standard time, or UTC time. Default is local wall time.
236 * @param savingsEndMonth The daylight savings ending month. Month is
237 * 0-based. eg, 0 for January.
238 * @param savingsEndDayOfWeekInMonth The daylight savings ending day-of-week-in-month.
239 * See setStartRule() for a complete explanation.
240 * @param savingsEndDayOfWeek The daylight savings ending day-of-week.
241 * See setStartRule() for a complete explanation.
242 * @param savingsEndTime The daylight savings ending time, expressed as the
243 * number of milliseconds after midnight.
244 * @param savingsEndTimeMode Whether the end time is local wall time, local
245 * standard time, or UTC time. Default is local wall time.
246 * @param savingsDST The number of milliseconds added to standard time
247 * to get DST time. Default is one hour.
248 * @param status An UErrorCode to receive the status.
249 * @stable ICU 2.0
250 */
251 SimpleTimeZone(int32_t rawOffsetGMT, const UnicodeString& ID,
252 int8_t savingsStartMonth, int8_t savingsStartDayOfWeekInMonth,
253 int8_t savingsStartDayOfWeek, int32_t savingsStartTime,
254 TimeMode savingsStartTimeMode,
255 int8_t savingsEndMonth, int8_t savingsEndDayOfWeekInMonth,
256 int8_t savingsEndDayOfWeek, int32_t savingsEndTime, TimeMode savingsEndTimeMode,
257 int32_t savingsDST, UErrorCode& status);
258
259 /**
260 * Sets the daylight savings starting year, that is, the year this time zone began
261 * observing its specified daylight savings time rules. The time zone is considered
262 * not to observe daylight savings time prior to that year; SimpleTimeZone doesn't
263 * support historical daylight-savings-time rules.
264 * @param year the daylight savings starting year.
265 * @stable ICU 2.0
266 */
267 void setStartYear(int32_t year);
268
269 /**
270 * Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
271 * Time starts at the first Sunday in April, at 2 AM in standard time.
272 * Therefore, you can set the start rule by calling:
273 * setStartRule(TimeFields.APRIL, 1, TimeFields.SUNDAY, 2*60*60*1000);
274 * The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
275 * the exact starting date. Their exact meaning depend on their respective signs,
276 * allowing various types of rules to be constructed, as follows:
277 * <ul>
278 * <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
279 * day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
280 * of the month).</li>
281 * <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
282 * the day of week in the month counting backward from the end of the month.
283 * (e.g., (-1, MONDAY) is the last Monday in the month)</li>
284 * <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
285 * specifies the day of the month, regardless of what day of the week it is.
286 * (e.g., (10, 0) is the tenth day of the month)</li>
287 * <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
288 * specifies the day of the month counting backward from the end of the
289 * month, regardless of what day of the week it is (e.g., (-2, 0) is the
290 * next-to-last day of the month).</li>
291 * <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
292 * first specified day of the week on or after the specfied day of the month.
293 * (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
294 * [or the 15th itself if the 15th is a Sunday].)</li>
295 * <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
296 * last specified day of the week on or before the specified day of the month.
297 * (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
298 * [or the 20th itself if the 20th is a Tuesday].)</li>
299 * </ul>
300 * @param month the daylight savings starting month. Month is 0-based.
301 * eg, 0 for January.
302 * @param dayOfWeekInMonth the daylight savings starting
303 * day-of-week-in-month. Please see the member description for an example.
304 * @param dayOfWeek the daylight savings starting day-of-week. Please see
305 * the member description for an example.
306 * @param time the daylight savings starting time. Please see the member
307 * description for an example.
308 * @param status An UErrorCode
309 * @stable ICU 2.0
310 */
311 void setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
312 int32_t time, UErrorCode& status);
313 /**
314 * Sets the daylight savings starting rule. For example, in the U.S., Daylight Savings
315 * Time starts at the first Sunday in April, at 2 AM in standard time.
316 * Therefore, you can set the start rule by calling:
317 * setStartRule(TimeFields.APRIL, 1, TimeFields.SUNDAY, 2*60*60*1000);
318 * The dayOfWeekInMonth and dayOfWeek parameters together specify how to calculate
319 * the exact starting date. Their exact meaning depend on their respective signs,
320 * allowing various types of rules to be constructed, as follows:
321 * <ul>
322 * <li>If both dayOfWeekInMonth and dayOfWeek are positive, they specify the
323 * day of week in the month (e.g., (2, WEDNESDAY) is the second Wednesday
324 * of the month).</li>
325 * <li>If dayOfWeek is positive and dayOfWeekInMonth is negative, they specify
326 * the day of week in the month counting backward from the end of the month.
327 * (e.g., (-1, MONDAY) is the last Monday in the month)</li>
328 * <li>If dayOfWeek is zero and dayOfWeekInMonth is positive, dayOfWeekInMonth
329 * specifies the day of the month, regardless of what day of the week it is.
330 * (e.g., (10, 0) is the tenth day of the month)</li>
331 * <li>If dayOfWeek is zero and dayOfWeekInMonth is negative, dayOfWeekInMonth
332 * specifies the day of the month counting backward from the end of the
333 * month, regardless of what day of the week it is (e.g., (-2, 0) is the
334 * next-to-last day of the month).</li>
335 * <li>If dayOfWeek is negative and dayOfWeekInMonth is positive, they specify the
336 * first specified day of the week on or after the specfied day of the month.
337 * (e.g., (15, -SUNDAY) is the first Sunday after the 15th of the month
338 * [or the 15th itself if the 15th is a Sunday].)</li>
339 * <li>If dayOfWeek and DayOfWeekInMonth are both negative, they specify the
340 * last specified day of the week on or before the specified day of the month.
341 * (e.g., (-20, -TUESDAY) is the last Tuesday before the 20th of the month
342 * [or the 20th itself if the 20th is a Tuesday].)</li>
343 * </ul>
344 * @param month the daylight savings starting month. Month is 0-based.
345 * eg, 0 for January.
346 * @param dayOfWeekInMonth the daylight savings starting
347 * day-of-week-in-month. Please see the member description for an example.
348 * @param dayOfWeek the daylight savings starting day-of-week. Please see
349 * the member description for an example.
350 * @param time the daylight savings starting time. Please see the member
351 * description for an example.
352 * @param mode whether the time is local wall time, local standard time,
353 * or UTC time. Default is local wall time.
354 * @param status An UErrorCode
355 * @stable ICU 2.0
356 */
357 void setStartRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
358 int32_t time, TimeMode mode, UErrorCode& status);
359
360 /**
361 * Sets the DST start rule to a fixed date within a month.
362 *
363 * @param month The month in which this rule occurs (0-based).
364 * @param dayOfMonth The date in that month (1-based).
365 * @param time The time of that day (number of millis after midnight)
366 * when DST takes effect in local wall time, which is
367 * standard time in this case.
368 * @param status An UErrorCode
369 * @stable ICU 2.0
370 */
371 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
372 UErrorCode& status);
373 /**
374 * Sets the DST start rule to a fixed date within a month.
375 *
376 * @param month The month in which this rule occurs (0-based).
377 * @param dayOfMonth The date in that month (1-based).
378 * @param time The time of that day (number of millis after midnight)
379 * when DST takes effect in local wall time, which is
380 * standard time in this case.
381 * @param mode whether the time is local wall time, local standard time,
382 * or UTC time. Default is local wall time.
383 * @param status An UErrorCode
384 * @stable ICU 2.0
385 */
386 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t time,
387 TimeMode mode, UErrorCode& status);
388
389 /**
390 * Sets the DST start rule to a weekday before or after a give date within
391 * a month, e.g., the first Monday on or after the 8th.
392 *
393 * @param month The month in which this rule occurs (0-based).
394 * @param dayOfMonth A date within that month (1-based).
395 * @param dayOfWeek The day of the week on which this rule occurs.
396 * @param time The time of that day (number of millis after midnight)
397 * when DST takes effect in local wall time, which is
398 * standard time in this case.
399 * @param after If true, this rule selects the first dayOfWeek on
400 * or after dayOfMonth. If false, this rule selects
401 * the last dayOfWeek on or before dayOfMonth.
402 * @param status An UErrorCode
403 * @stable ICU 2.0
404 */
405 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
406 int32_t time, UBool after, UErrorCode& status);
407 /**
408 * Sets the DST start rule to a weekday before or after a give date within
409 * a month, e.g., the first Monday on or after the 8th.
410 *
411 * @param month The month in which this rule occurs (0-based).
412 * @param dayOfMonth A date within that month (1-based).
413 * @param dayOfWeek The day of the week on which this rule occurs.
414 * @param time The time of that day (number of millis after midnight)
415 * when DST takes effect in local wall time, which is
416 * standard time in this case.
417 * @param mode whether the time is local wall time, local standard time,
418 * or UTC time. Default is local wall time.
419 * @param after If true, this rule selects the first dayOfWeek on
420 * or after dayOfMonth. If false, this rule selects
421 * the last dayOfWeek on or before dayOfMonth.
422 * @param status An UErrorCode
423 * @stable ICU 2.0
424 */
425 void setStartRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
426 int32_t time, TimeMode mode, UBool after, UErrorCode& status);
427
428 /**
429 * Sets the daylight savings ending rule. For example, in the U.S., Daylight
430 * Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
431 * Therefore, you can set the end rule by calling:
432 * <pre>
433 * . setEndRule(TimeFields.OCTOBER, -1, TimeFields.SUNDAY, 2*60*60*1000);
434 * </pre>
435 * Various other types of rules can be specified by manipulating the dayOfWeek
436 * and dayOfWeekInMonth parameters. For complete details, see the documentation
437 * for setStartRule().
438 *
439 * @param month the daylight savings ending month. Month is 0-based.
440 * eg, 0 for January.
441 * @param dayOfWeekInMonth the daylight savings ending
442 * day-of-week-in-month. See setStartRule() for a complete explanation.
443 * @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
444 * for a complete explanation.
445 * @param time the daylight savings ending time. Please see the member
446 * description for an example.
447 * @param status An UErrorCode
448 * @stable ICU 2.0
449 */
450 void setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
451 int32_t time, UErrorCode& status);
452
453 /**
454 * Sets the daylight savings ending rule. For example, in the U.S., Daylight
455 * Savings Time ends at the last (-1) Sunday in October, at 2 AM in standard time.
456 * Therefore, you can set the end rule by calling:
457 * <pre>
458 * . setEndRule(TimeFields.OCTOBER, -1, TimeFields.SUNDAY, 2*60*60*1000);
459 * </pre>
460 * Various other types of rules can be specified by manipulating the dayOfWeek
461 * and dayOfWeekInMonth parameters. For complete details, see the documentation
462 * for setStartRule().
463 *
464 * @param month the daylight savings ending month. Month is 0-based.
465 * eg, 0 for January.
466 * @param dayOfWeekInMonth the daylight savings ending
467 * day-of-week-in-month. See setStartRule() for a complete explanation.
468 * @param dayOfWeek the daylight savings ending day-of-week. See setStartRule()
469 * for a complete explanation.
470 * @param time the daylight savings ending time. Please see the member
471 * description for an example.
472 * @param mode whether the time is local wall time, local standard time,
473 * or UTC time. Default is local wall time.
474 * @param status An UErrorCode
475 * @stable ICU 2.0
476 */
477 void setEndRule(int32_t month, int32_t dayOfWeekInMonth, int32_t dayOfWeek,
478 int32_t time, TimeMode mode, UErrorCode& status);
479
480 /**
481 * Sets the DST end rule to a fixed date within a month.
482 *
483 * @param month The month in which this rule occurs (0-based).
484 * @param dayOfMonth The date in that month (1-based).
485 * @param time The time of that day (number of millis after midnight)
486 * when DST ends in local wall time, which is daylight
487 * time in this case.
488 * @param status An UErrorCode
489 * @stable ICU 2.0
490 */
491 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time, UErrorCode& status);
492
493 /**
494 * Sets the DST end rule to a fixed date within a month.
495 *
496 * @param month The month in which this rule occurs (0-based).
497 * @param dayOfMonth The date in that month (1-based).
498 * @param time The time of that day (number of millis after midnight)
499 * when DST ends in local wall time, which is daylight
500 * time in this case.
501 * @param mode whether the time is local wall time, local standard time,
502 * or UTC time. Default is local wall time.
503 * @param status An UErrorCode
504 * @stable ICU 2.0
505 */
506 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t time,
507 TimeMode mode, UErrorCode& status);
508
509 /**
510 * Sets the DST end rule to a weekday before or after a give date within
511 * a month, e.g., the first Monday on or after the 8th.
512 *
513 * @param month The month in which this rule occurs (0-based).
514 * @param dayOfMonth A date within that month (1-based).
515 * @param dayOfWeek The day of the week on which this rule occurs.
516 * @param time The time of that day (number of millis after midnight)
517 * when DST ends in local wall time, which is daylight
518 * time in this case.
519 * @param after If true, this rule selects the first dayOfWeek on
520 * or after dayOfMonth. If false, this rule selects
521 * the last dayOfWeek on or before dayOfMonth.
522 * @param status An UErrorCode
523 * @stable ICU 2.0
524 */
525 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
526 int32_t time, UBool after, UErrorCode& status);
527
528 /**
529 * Sets the DST end rule to a weekday before or after a give date within
530 * a month, e.g., the first Monday on or after the 8th.
531 *
532 * @param month The month in which this rule occurs (0-based).
533 * @param dayOfMonth A date within that month (1-based).
534 * @param dayOfWeek The day of the week on which this rule occurs.
535 * @param time The time of that day (number of millis after midnight)
536 * when DST ends in local wall time, which is daylight
537 * time in this case.
538 * @param mode whether the time is local wall time, local standard time,
539 * or UTC time. Default is local wall time.
540 * @param after If true, this rule selects the first dayOfWeek on
541 * or after dayOfMonth. If false, this rule selects
542 * the last dayOfWeek on or before dayOfMonth.
543 * @param status An UErrorCode
544 * @stable ICU 2.0
545 */
546 void setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
547 int32_t time, TimeMode mode, UBool after, UErrorCode& status);
548
549 /**
550 * Returns the TimeZone's adjusted GMT offset (i.e., the number of milliseconds to add
551 * to GMT to get local time in this time zone, taking daylight savings time into
552 * account) as of a particular reference date. The reference date is used to determine
553 * whether daylight savings time is in effect and needs to be figured into the offset
554 * that is returned (in other words, what is the adjusted GMT offset in this time zone
555 * at this particular date and time?). For the time zones produced by createTimeZone(),
556 * the reference data is specified according to the Gregorian calendar, and the date
557 * and time fields are in GMT, NOT local time.
558 *
559 * @param era The reference date's era
560 * @param year The reference date's year
561 * @param month The reference date's month (0-based; 0 is January)
562 * @param day The reference date's day-in-month (1-based)
563 * @param dayOfWeek The reference date's day-of-week (1-based; 1 is Sunday)
564 * @param millis The reference date's milliseconds in day, UTT (NOT local time).
565 * @param status An UErrorCode to receive the status.
566 * @return The offset in milliseconds to add to GMT to get local time.
567 * @stable ICU 2.0
568 */
569 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
570 uint8_t dayOfWeek, int32_t millis, UErrorCode& status) const;
571
572 /**
573 * Gets the time zone offset, for current date, modified in case of
574 * daylight savings. This is the offset to add *to* UTC to get local time.
575 * @param era the era of the given date.
576 * @param year the year in the given date.
577 * @param month the month in the given date.
578 * Month is 0-based. e.g., 0 for January.
579 * @param day the day-in-month of the given date.
580 * @param dayOfWeek the day-of-week of the given date.
581 * @param milliseconds the millis in day in <em>standard</em> local time.
582 * @param monthLength the length of the given month in days.
583 * @param status An UErrorCode to receive the status.
584 * @return the offset to add *to* GMT to get local time.
585 * @stable ICU 2.0
586 */
587 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
588 uint8_t dayOfWeek, int32_t milliseconds,
589 int32_t monthLength, UErrorCode& status) const;
590 /**
591 * Gets the time zone offset, for current date, modified in case of
592 * daylight savings. This is the offset to add *to* UTC to get local time.
593 * @param era the era of the given date.
594 * @param year the year in the given date.
595 * @param month the month in the given date.
596 * Month is 0-based. e.g., 0 for January.
597 * @param day the day-in-month of the given date.
598 * @param dayOfWeek the day-of-week of the given date.
599 * @param milliseconds the millis in day in <em>standard</em> local time.
600 * @param monthLength the length of the given month in days.
601 * @param prevMonthLength length of the previous month in days.
602 * @param status An UErrorCode to receive the status.
603 * @return the offset to add *to* GMT to get local time.
604 * @stable ICU 2.0
605 */
606 virtual int32_t getOffset(uint8_t era, int32_t year, int32_t month, int32_t day,
607 uint8_t dayOfWeek, int32_t milliseconds,
608 int32_t monthLength, int32_t prevMonthLength,
609 UErrorCode& status) const;
610
611 /**
612 * Redeclared TimeZone method. This implementation simply calls
613 * the base class method, which otherwise would be hidden.
614 * @stable ICU 2.8
615 */
616 virtual void getOffset(UDate date, UBool local, int32_t& rawOffset,
617 int32_t& dstOffset, UErrorCode& ec) const;
618
619 /**
620 * Get time zone offsets from local wall time.
621 * @internal
622 */
623 virtual void getOffsetFromLocal(UDate date, int32_t nonExistingTimeOpt, int32_t duplicatedTimeOpt,
624 int32_t& rawOffset, int32_t& dstOffset, UErrorCode& status) /*const*/;
625
626 /**
627 * Returns the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
628 * to GMT to get local time, before taking daylight savings time into account).
629 *
630 * @return The TimeZone's raw GMT offset.
631 * @stable ICU 2.0
632 */
633 virtual int32_t getRawOffset(void) const;
634
635 /**
636 * Sets the TimeZone's raw GMT offset (i.e., the number of milliseconds to add
637 * to GMT to get local time, before taking daylight savings time into account).
638 *
639 * @param offsetMillis The new raw GMT offset for this time zone.
640 * @stable ICU 2.0
641 */
642 virtual void setRawOffset(int32_t offsetMillis);
643
644 /**
645 * Sets the amount of time in ms that the clock is advanced during DST.
646 * @param millisSavedDuringDST the number of milliseconds the time is
647 * advanced with respect to standard time when the daylight savings rules
648 * are in effect. A positive number, typically one hour (3600000).
649 * @param status An UErrorCode to receive the status.
650 * @stable ICU 2.0
651 */
652 void setDSTSavings(int32_t millisSavedDuringDST, UErrorCode& status);
653
654 /**
655 * Returns the amount of time in ms that the clock is advanced during DST.
656 * @return the number of milliseconds the time is
657 * advanced with respect to standard time when the daylight savings rules
658 * are in effect. A positive number, typically one hour (3600000).
659 * @stable ICU 2.0
660 */
661 virtual int32_t getDSTSavings(void) const;
662
663 /**
664 * Queries if this TimeZone uses Daylight Savings Time.
665 *
666 * @return True if this TimeZone uses Daylight Savings Time; false otherwise.
667 * @stable ICU 2.0
668 */
669 virtual UBool useDaylightTime(void) const;
670
671 /**
672 * Returns true if the given date is within the period when daylight savings time
673 * is in effect; false otherwise. If the TimeZone doesn't observe daylight savings
674 * time, this functions always returns false.
675 * This method is wasteful since it creates a new GregorianCalendar and
676 * deletes it each time it is called. This is a deprecated method
677 * and provided only for Java compatibility.
678 *
679 * @param date The date to test.
680 * @param status An UErrorCode to receive the status.
681 * @return true if the given date is in Daylight Savings Time;
682 * false otherwise.
683 * @deprecated ICU 2.4. Use Calendar::inDaylightTime() instead.
684 */
685 virtual UBool inDaylightTime(UDate date, UErrorCode& status) const;
686
687 /**
688 * Return true if this zone has the same rules and offset as another zone.
689 * @param other the TimeZone object to be compared with
690 * @return true if the given zone has the same rules and offset as this one
691 * @stable ICU 2.0
692 */
693 UBool hasSameRules(const TimeZone& other) const;
694
695 /**
696 * Clones TimeZone objects polymorphically. Clients are responsible for deleting
697 * the TimeZone object cloned.
698 *
699 * @return A new copy of this TimeZone object.
700 * @stable ICU 2.0
701 */
702 virtual TimeZone* clone(void) const;
703
704 /**
705 * Gets the first time zone transition after the base time.
706 * @param base The base time.
707 * @param inclusive Whether the base time is inclusive or not.
708 * @param result Receives the first transition after the base time.
709 * @return TRUE if the transition is found.
710 * @draft ICU 3.8
711 */
712 virtual UBool getNextTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/;
713
714 /**
715 * Gets the most recent time zone transition before the base time.
716 * @param base The base time.
717 * @param inclusive Whether the base time is inclusive or not.
718 * @param result Receives the most recent transition before the base time.
719 * @return TRUE if the transition is found.
720 * @draft ICU 3.8
721 */
722 virtual UBool getPreviousTransition(UDate base, UBool inclusive, TimeZoneTransition& result) /*const*/;
723
724 /**
725 * Returns the number of <code>TimeZoneRule</code>s which represents time transitions,
726 * for this time zone, that is, all <code>TimeZoneRule</code>s for this time zone except
727 * <code>InitialTimeZoneRule</code>. The return value range is 0 or any positive value.
728 * @param status Receives error status code.
729 * @return The number of <code>TimeZoneRule</code>s representing time transitions.
730 * @draft ICU 3.8
731 */
732 virtual int32_t countTransitionRules(UErrorCode& status) /*const*/;
733
734 /**
735 * Gets the <code>InitialTimeZoneRule</code> and the set of <code>TimeZoneRule</code>
736 * which represent time transitions for this time zone. On successful return,
737 * the argument initial points to non-NULL <code>InitialTimeZoneRule</code> and
738 * the array trsrules is filled with 0 or multiple <code>TimeZoneRule</code>
739 * instances up to the size specified by trscount. The results are referencing the
740 * rule instance held by this time zone instance. Therefore, after this time zone
741 * is destructed, they are no longer available.
742 * @param initial Receives the initial timezone rule
743 * @param trsrules Receives the timezone transition rules
744 * @param trscount On input, specify the size of the array 'transitions' receiving
745 * the timezone transition rules. On output, actual number of
746 * rules filled in the array will be set.
747 * @param status Receives error status code.
748 * @draft ICU 3.8
749 */
750 virtual void getTimeZoneRules(const InitialTimeZoneRule*& initial,
751 const TimeZoneRule* trsrules[], int32_t& trscount, UErrorCode& status) /*const*/;
752
753
754 public:
755
756 /**
757 * Override TimeZone Returns a unique class ID POLYMORPHICALLY. Pure virtual
758 * override. This method is to implement a simple version of RTTI, since not all C++
759 * compilers support genuine RTTI. Polymorphic operator==() and clone() methods call
760 * this method.
761 *
762 * @return The class ID for this object. All objects of a given class have the
763 * same class ID. Objects of other classes have different class IDs.
764 * @stable ICU 2.0
765 */
766 virtual UClassID getDynamicClassID(void) const;
767
768 /**
769 * Return the class ID for this class. This is useful only for comparing to a return
770 * value from getDynamicClassID(). For example:
771 * <pre>
772 * . Base* polymorphic_pointer = createPolymorphicObject();
773 * . if (polymorphic_pointer->getDynamicClassID() ==
774 * . Derived::getStaticClassID()) ...
775 * </pre>
776 * @return The class ID for all objects of this class.
777 * @stable ICU 2.0
778 */
779 static UClassID U_EXPORT2 getStaticClassID(void);
780
781 private:
782 /**
783 * Constants specifying values of startMode and endMode.
784 */
785 enum EMode
786 {
787 DOM_MODE = 1,
788 DOW_IN_MONTH_MODE,
789 DOW_GE_DOM_MODE,
790 DOW_LE_DOM_MODE
791 };
792
793 SimpleTimeZone(); // default constructor not implemented
794
795 /**
796 * Internal construction method.
797 * @param rawOffsetGMT The new SimpleTimeZone's raw GMT offset
798 * @param startMonth the month DST starts
799 * @param startDay the day DST starts
800 * @param startDayOfWeek the DOW DST starts
801 * @param startTime the time DST starts
802 * @param startTimeMode Whether the start time is local wall time, local
803 * standard time, or UTC time. Default is local wall time.
804 * @param endMonth the month DST ends
805 * @param endDay the day DST ends
806 * @param endDayOfWeek the DOW DST ends
807 * @param endTime the time DST ends
808 * @param endTimeMode Whether the end time is local wall time, local
809 * standard time, or UTC time. Default is local wall time.
810 * @param savingsDST The number of milliseconds added to standard time
811 * to get DST time. Default is one hour.
812 * @param status An UErrorCode to receive the status.
813 */
814 void construct(int32_t rawOffsetGMT,
815 int8_t startMonth, int8_t startDay, int8_t startDayOfWeek,
816 int32_t startTime, TimeMode startTimeMode,
817 int8_t endMonth, int8_t endDay, int8_t endDayOfWeek,
818 int32_t endTime, TimeMode endTimeMode,
819 int32_t dstSavings, UErrorCode& status);
820
821 /**
822 * Compare a given date in the year to a rule. Return 1, 0, or -1, depending
823 * on whether the date is after, equal to, or before the rule date. The
824 * millis are compared directly against the ruleMillis, so any
825 * standard-daylight adjustments must be handled by the caller.
826 *
827 * @return 1 if the date is after the rule date, -1 if the date is before
828 * the rule date, or 0 if the date is equal to the rule date.
829 */
830 static int32_t compareToRule(int8_t month, int8_t monthLen, int8_t prevMonthLen,
831 int8_t dayOfMonth,
832 int8_t dayOfWeek, int32_t millis, int32_t millisDelta,
833 EMode ruleMode, int8_t ruleMonth, int8_t ruleDayOfWeek,
834 int8_t ruleDay, int32_t ruleMillis);
835
836 /**
837 * Given a set of encoded rules in startDay and startDayOfMonth, decode
838 * them and set the startMode appropriately. Do the same for endDay and
839 * endDayOfMonth.
840 * <P>
841 * Upon entry, the day of week variables may be zero or
842 * negative, in order to indicate special modes. The day of month
843 * variables may also be negative.
844 * <P>
845 * Upon exit, the mode variables will be
846 * set, and the day of week and day of month variables will be positive.
847 * <P>
848 * This method also recognizes a startDay or endDay of zero as indicating
849 * no DST.
850 */
851 void decodeRules(UErrorCode& status);
852 void decodeStartRule(UErrorCode& status);
853 void decodeEndRule(UErrorCode& status);
854
855 int8_t startMonth, startDay, startDayOfWeek; // the month, day, DOW, and time DST starts
856 int32_t startTime;
857 TimeMode startTimeMode, endTimeMode; // Mode for startTime, endTime; see TimeMode
858 int8_t endMonth, endDay, endDayOfWeek; // the month, day, DOW, and time DST ends
859 int32_t endTime;
860 int32_t startYear; // the year these DST rules took effect
861 int32_t rawOffset; // the TimeZone's raw GMT offset
862 UBool useDaylight; // flag indicating whether this TimeZone uses DST
863 static const int8_t STATICMONTHLENGTH[12]; // lengths of the months
864 EMode startMode, endMode; // flags indicating what kind of rules the DST rules are
865
866 /**
867 * A positive value indicating the amount of time saved during DST in ms.
868 * Typically one hour; sometimes 30 minutes.
869 */
870 int32_t dstSavings;
871
872 /* Private for BasicTimeZone implementation */
873 void initTransitionRules(UErrorCode& status);
874 void clearTransitionRules(void);
875 void deleteTransitionRules(void);
876 UBool transitionRulesInitialized;
877 InitialTimeZoneRule* initialRule;
878 TimeZoneTransition* firstTransition;
879 AnnualTimeZoneRule* stdRule;
880 AnnualTimeZoneRule* dstRule;
881 };
882
setStartRule(int32_t month,int32_t dayOfWeekInMonth,int32_t dayOfWeek,int32_t time,UErrorCode & status)883 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfWeekInMonth,
884 int32_t dayOfWeek,
885 int32_t time, UErrorCode& status) {
886 setStartRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
887 }
888
setStartRule(int32_t month,int32_t dayOfMonth,int32_t time,UErrorCode & status)889 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
890 int32_t time,
891 UErrorCode& status) {
892 setStartRule(month, dayOfMonth, time, WALL_TIME, status);
893 }
894
setStartRule(int32_t month,int32_t dayOfMonth,int32_t dayOfWeek,int32_t time,UBool after,UErrorCode & status)895 inline void SimpleTimeZone::setStartRule(int32_t month, int32_t dayOfMonth,
896 int32_t dayOfWeek,
897 int32_t time, UBool after, UErrorCode& status) {
898 setStartRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
899 }
900
setEndRule(int32_t month,int32_t dayOfWeekInMonth,int32_t dayOfWeek,int32_t time,UErrorCode & status)901 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfWeekInMonth,
902 int32_t dayOfWeek,
903 int32_t time, UErrorCode& status) {
904 setEndRule(month, dayOfWeekInMonth, dayOfWeek, time, WALL_TIME, status);
905 }
906
setEndRule(int32_t month,int32_t dayOfMonth,int32_t time,UErrorCode & status)907 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth,
908 int32_t time, UErrorCode& status) {
909 setEndRule(month, dayOfMonth, time, WALL_TIME, status);
910 }
911
setEndRule(int32_t month,int32_t dayOfMonth,int32_t dayOfWeek,int32_t time,UBool after,UErrorCode & status)912 inline void SimpleTimeZone::setEndRule(int32_t month, int32_t dayOfMonth, int32_t dayOfWeek,
913 int32_t time, UBool after, UErrorCode& status) {
914 setEndRule(month, dayOfMonth, dayOfWeek, time, WALL_TIME, after, status);
915 }
916
917 inline void
getOffset(UDate date,UBool local,int32_t & rawOffsetRef,int32_t & dstOffsetRef,UErrorCode & ec)918 SimpleTimeZone::getOffset(UDate date, UBool local, int32_t& rawOffsetRef,
919 int32_t& dstOffsetRef, UErrorCode& ec) const {
920 TimeZone::getOffset(date, local, rawOffsetRef, dstOffsetRef, ec);
921 }
922
923 U_NAMESPACE_END
924
925 #endif /* #if !UCONFIG_NO_FORMATTING */
926
927 #endif // _SIMPLETZ
928