1 /* Copyright (c) 2002,2003 CrystalClear Software, Inc.
2 * Use, modification and distribution is subject to the
3 * Boost Software License, Version 1.0. (See accompanying
4 * file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
5 * Author: Jeff Garland
6 */
7
8 #include <stdexcept>
9 #include "boost/date_time/posix_time/posix_time.hpp"
10 #include "boost/date_time/c_local_time_adjustor.hpp"
11 #include "../testfrmwk.hpp"
12
13 int
main()14 main()
15 {
16 using namespace boost::posix_time;
17 using namespace boost::gregorian;
18
19 //These are a compile check / test. They have to be hand inspected
20 //b/c they depend on the TZ settings of the machine and hence it is
21 //unclear what the results will be
22 typedef boost::date_time::c_local_adjustor<ptime> local_adj;
23
24 bool btd1e = false;
25 bool btd2e = false;
26 bool btd3e = false;
27 time_duration td1;
28 time_duration td2;
29 time_duration td3;
30
31 try
32 {
33 ptime t1(date(2002,Jan,1), hours(7)+millisec(5));
34 std::cout << "UTC <--> TZ Setting of Machine -- No DST" << std::endl;
35 ptime t2 = local_adj::utc_to_local(t1);
36 std::cout << t2 << " LOCAL is "
37 << t1 << " UTC time "
38 << std::endl;
39 td1 = t2 - t1;
40 std::cout << "A difference of: " << td1
41 << std::endl;
42 }
43 catch (std::runtime_error & re)
44 {
45 btd1e = true;
46 check(re.what(), false);
47 }
48
49 try
50 {
51 ptime t3(date(2002,May,1), hours(5)+millisec(5));
52 std::cout << "UTC <--> TZ Setting of Machine -- In DST" << std::endl;
53 ptime t4 = local_adj::utc_to_local(t3);
54 std::cout << t4 << " LOCAL is "
55 << t3 << " UTC time "
56 << std::endl;
57 td2 = t4 - t3;
58 std::cout << "A difference of: " << td2
59 << std::endl;
60 }
61 catch (std::runtime_error & re)
62 {
63 btd2e = true;
64 check(re.what(), false);
65 }
66
67 try
68 {
69 ptime t5(date(2040,May,1), hours(5)+millisec(5));
70 std::cout << "UTC <--> TZ Setting of Machine -- In DST" << std::endl;
71 ptime t6 = local_adj::utc_to_local(t5);
72 std::cout << t6 << " LOCAL is "
73 << t5 << " UTC time "
74 << std::endl;
75 td3 = t6 - t5;
76 std::cout << "a difference of: " << td3
77 << std::endl;
78 }
79 catch (std::runtime_error & re)
80 {
81 btd3e = true;
82 check(re.what(), false);
83 }
84 catch (std::bad_cast&)
85 {
86 btd3e = true;
87 check("32-bit time_t overflow detected", sizeof(std::time_t) < 8);
88 }
89
90 // The following tests are unaware of the local time zone, but they
91 // should help spot some errors. Manual inspection could still be
92 // required.
93
94 // Based on http://stackoverflow.com/questions/8131023
95 // All time zones are between -12 and +14
96 if (!btd1e)
97 {
98 check("td1 isn't too low", td1 >= hours(-12));
99 check("td1 isn't too high", td1 <= hours(14));
100 }
101 if (!btd2e)
102 {
103 check("td2 isn't too low", td2 >= hours(-12));
104 check("td2 isn't too high", td2 <= hours(14));
105 }
106 if (!btd3e)
107 {
108 check("td3 isn't too low", td3 >= hours(-12));
109 check("td3 isn't too high", td3 <= hours(14));
110 }
111
112 // Assuming that no one uses DST of more than an hour.
113 if (!btd1e && !btd2e)
114 {
115 check("td1 and td2 are close",
116 td1 - td2 <= hours(1) && td2 - td1 <= hours(1));
117 }
118 if (!btd2e && !btd3e)
119 {
120 check("td2 and td3 are close",
121 td2 - td3 <= hours(2) && td3 - td2 <= hours(2));
122 }
123 if (!btd1e && !btd3e)
124 {
125 check("td1 and td3 are close",
126 td1 - td3 <= hours(1) && td3 - td1 <= hours(1));
127 }
128
129 return printTestStats();
130 }
131
132