1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
|
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Examples</title>
<link rel="stylesheet" href="../../../doc/src/boostbook.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.76.1">
<link rel="home" href="../index.html" title="The Boost C++ Libraries BoostBook Documentation Subset">
<link rel="up" href="../date_time.html" title="Chapter 7. Boost.Date_Time">
<link rel="prev" href="details.html" title="Details">
<link rel="next" href="doxy.html" title="Library Reference">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table cellpadding="2" width="100%"><tr>
<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../boost.png"></td>
<td align="center"><a href="../../../index.html">Home</a></td>
<td align="center"><a href="../../../libs/libraries.htm">Libraries</a></td>
<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
<td align="center"><a href="../../../more/index.htm">More</a></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="details.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../date_time.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="doxy.html"><img src="../../../doc/src/images/next.png" alt="Next"></a>
</div>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="date_time.examples"></a>Examples</h2></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="examples.html#date_time.examples.dates_as_strings">Dates as Strings</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.days_alive">Days Alive</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.days_between_new_year">Days Between New Years</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.end_of_month_day">Last Day of the Months</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.localization">Localization Demonstration</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.date_period_calc">Date Period Calculations</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.print_holidays">Print Holidays</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.print_month">Print Month</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.month_add">Month Adding</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.time_math">Time Math</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.print_hours">Print Hours</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.local_utc_conversion">Local to UTC Conversion</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.time_periods">Time Periods</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.simple_time_zone">Simple Time Zones</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.calc_rules">Daylight Savings Calc Rules</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.flight">Flight Time Example</a></span></dt>
<dt><span class="section"><a href="examples.html#date_time.examples.seconds_since_epoch">Seconds Since Epoch</a></span></dt>
</dl></div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.dates_as_strings"></a>Dates as Strings</h3></div></div></div>
<p>
Various parsing and output of strings.
</p>
<pre class="programlisting">
/* The following is a simple example that shows conversion of dates
* to and from a std::string.
*
* Expected output:
* 2001-Oct-09
* 2001-10-09
* Tuesday October 9, 2001
* An expected exception is next:
* Exception: Month number is out of range 1..12
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
#include <string>
int
main()
{
using namespace boost::gregorian;
try {
// The following date is in ISO 8601 extended format (CCYY-MM-DD)
std::string s("2001-10-9"); //2001-October-09
date d(from_simple_string(s));
std::cout << to_simple_string(d) << std::endl;
//Read ISO Standard(CCYYMMDD) and output ISO Extended
std::string ud("20011009"); //2001-Oct-09
date d1(from_undelimited_string(ud));
std::cout << to_iso_extended_string(d1) << std::endl;
//Output the parts of the date - Tuesday October 9, 2001
date::ymd_type ymd = d1.year_month_day();
greg_weekday wd = d1.day_of_week();
std::cout << wd.as_long_string() << " "
<< ymd.month.as_long_string() << " "
<< ymd.day << ", " << ymd.year
<< std::endl;
//Let's send in month 25 by accident and create an exception
std::string bad_date("20012509"); //2001-??-09
std::cout << "An expected exception is next: " << std::endl;
date wont_construct(from_undelimited_string(bad_date));
//use wont_construct so compiler doesn't complain, but you wont get here!
std::cout << "oh oh, you shouldn't reach this line: "
<< to_iso_string(wont_construct) << std::endl;
}
catch(std::exception& e) {
std::cout << " Exception: " << e.what() << std::endl;
}
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.days_alive"></a>Days Alive</h3></div></div></div>
<p>
Calculate the number of days you have been living using durations and dates.
</p>
<pre class="programlisting">
<code class="literal">
<span class="comment">/* Short example that calculates the number of days since user was born.
* Demonstrates comparisons of durations, use of the day_clock,
* and parsing a date from a string.
*/</span><span class="preprocessor">
#include</span><span class="string"> "boost/date_time/gregorian/gregorian.hpp"</span><span class="preprocessor">
#include</span><span class="special"> <</span><span class="identifier">iostream</span><span class="special">></span><span class="keyword">
int</span><span class="identifier">
main</span><span class="special">()</span><span class="special">
{</span><span class="keyword">
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">string</span><span class="identifier"> s</span><span class="special">;</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Enter birth day YYYY-MM-DD (eg: 2002-02-01): "</span><span class="special">;</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cin</span><span class="special"> >></span><span class="identifier"> s</span><span class="special">;</span><span class="keyword">
try</span><span class="special"> {</span><span class="identifier">
date</span><span class="identifier"> birthday</span><span class="special">(</span><span class="identifier">from_simple_string</span><span class="special">(</span><span class="identifier">s</span><span class="special">));</span><span class="identifier">
date</span><span class="identifier"> today</span><span class="special"> =</span><span class="identifier"> day_clock</span><span class="special">::</span><span class="identifier">local_day</span><span class="special">();</span><span class="identifier">
days</span><span class="identifier"> days_alive</span><span class="special"> =</span><span class="identifier"> today</span><span class="special"> -</span><span class="identifier"> birthday</span><span class="special">;</span><span class="identifier">
days</span><span class="identifier"> one_day</span><span class="special">(</span><span class="number">1</span><span class="special">);</span><span class="keyword">
if</span><span class="special"> (</span><span class="identifier">days_alive</span><span class="special"> ==</span><span class="identifier"> one_day</span><span class="special">)</span><span class="special"> {</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Born yesterday, very funny"</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
else</span><span class="keyword"> if</span><span class="special"> (</span><span class="identifier">days_alive</span><span class="special"> <</span><span class="identifier"> days</span><span class="special">(</span><span class="number">0</span><span class="special">))</span><span class="special"> {</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Not born yet, hmm: "</span><span class="special"> <<</span><span class="identifier"> days_alive</span><span class="special">.</span><span class="identifier">days</span><span class="special">()</span><span class="special">
<<</span><span class="string"> " days"</span><span class="special"> <<</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
else</span><span class="special"> {</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Days alive: "</span><span class="special"> <<</span><span class="identifier"> days_alive</span><span class="special">.</span><span class="identifier">days</span><span class="special">()</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special">
}</span><span class="special">
}</span><span class="keyword">
catch</span><span class="special">(...)</span><span class="special"> {</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "Bad date entered: "</span><span class="special"> <<</span><span class="identifier"> s</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special">
}</span><span class="keyword">
return</span><span class="number"> 0</span><span class="special">;</span><span class="special">
}</span>
</code>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.days_between_new_year"></a>Days Between New Years</h3></div></div></div>
<p>
Calculate the number of days till new years
</p>
<pre class="programlisting">
/* Provides a simple example of using a date_generator, and simple
* mathematical operatorations, to calculate the days since
* New Years day of this year, and days until next New Years day.
*
* Expected results:
* Adding together both durations will produce 366 (365 in a leap year).
*/
#include <iostream>
#include "boost/date_time/gregorian/gregorian.hpp"
int
main()
{
using namespace boost::gregorian;
date today = day_clock::local_day();
partial_date new_years_day(1,Jan);
//Subtract two dates to get a duration
days days_since_year_start = today - new_years_day.get_date(today.year());
std::cout << "Days since Jan 1: " << days_since_year_start.days()
<< std::endl;
days days_until_year_start = new_years_day.get_date(today.year()+1) - today;
std::cout << "Days until next Jan 1: " << days_until_year_start.days()
<< std::endl;
return 0;
};
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.end_of_month_day"></a>Last Day of the Months</h3></div></div></div>
<p>
Example that gets a month and a year from the user and finds the last day of each remaining month of that year.
</p>
<pre class="programlisting">
/* Simple program that finds the last day of the given month,
* then displays the last day of every month left in the given year.
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
int
main()
{
using namespace boost::gregorian;
greg_year year(1400);
greg_month month(1);
// get a month and a year from the user
try {
int y, m;
std::cout << " Enter Year(ex: 2002): ";
std::cin >> y;
year = greg_year(y);
std::cout << " Enter Month(1..12): ";
std::cin >> m;
month = greg_month(m);
}
catch(bad_year by) {
std::cout << "Invalid Year Entered: " << by.what() << '\n'
<< "Using minimum values for month and year." << std::endl;
}
catch(bad_month bm) {
std::cout << "Invalid Month Entered" << bm.what() << '\n'
<< "Using minimum value for month. " << std::endl;
}
date start_of_next_year(year+1, Jan, 1);
date d(year, month, 1);
// add another month to d until we enter the next year.
while (d < start_of_next_year){
std::cout << to_simple_string(d.end_of_month()) << std::endl;
d += months(1);
}
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.localization"></a>Localization Demonstration</h3></div></div></div>
<p>
The boost::date_time library provides the ability to create customized locale facets. Date ordering, language, seperators, and abbreviations can be customized.
</p>
<pre class="programlisting">
/* The following shows the creation of a facet for the output of
* dates in German (please forgive me for any errors in my German --
* I'm not a native speaker).
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
#include <algorithm>
/* Define a series of char arrays for short and long name strings
* to be associated with German date output (US names will be
* retrieved from the locale). */
const char* const de_short_month_names[] =
{
"Jan", "Feb", "Mar", "Apr", "Mai", "Jun",
"Jul", "Aug", "Sep", "Okt", "Nov", "Dez", "NAM"
};
const char* const de_long_month_names[] =
{
"Januar", "Februar", "Marz", "April", "Mai",
"Juni", "Juli", "August", "September", "Oktober",
"November", "Dezember", "NichtDerMonat"
};
const char* const de_long_weekday_names[] =
{
"Sonntag", "Montag", "Dienstag", "Mittwoch",
"Donnerstag", "Freitag", "Samstag"
};
const char* const de_short_weekday_names[] =
{
"Son", "Mon", "Die","Mit", "Don", "Fre", "Sam"
};
int main()
{
using namespace boost::gregorian;
// create some gregorian objects to output
date d1(2002, Oct, 1);
greg_month m = d1.month();
greg_weekday wd = d1.day_of_week();
// create a facet and a locale for German dates
date_facet* german_facet = new date_facet();
std::cout.imbue(std::locale(std::locale::classic(), german_facet));
// create the German name collections
date_facet::input_collection_type short_months, long_months,
short_weekdays, long_weekdays;
std::copy(&de_short_month_names[0], &de_short_month_names[11],
std::back_inserter(short_months));
std::copy(&de_long_month_names[0], &de_long_month_names[11],
std::back_inserter(long_months));
std::copy(&de_short_weekday_names[0], &de_short_weekday_names[6],
std::back_inserter(short_weekdays));
std::copy(&de_long_weekday_names[0], &de_long_weekday_names[6],
std::back_inserter(long_weekdays));
// replace the default names with ours
// NOTE: date_generators and special_values were not replaced as
// they are not used in this example
german_facet->short_month_names(short_months);
german_facet->long_month_names(long_months);
german_facet->short_weekday_names(short_weekdays);
german_facet->long_weekday_names(long_weekdays);
// output the date in German using short month names
german_facet->format("%d.%m.%Y");
std::cout << d1 << std::endl; //01.10.2002
german_facet->month_format("%B");
std::cout << m << std::endl; //Oktober
german_facet->weekday_format("%A");
std::cout << wd << std::endl; //Dienstag
// Output the same gregorian objects using US names
date_facet* us_facet = new date_facet();
std::cout.imbue(std::locale(std::locale::classic(), us_facet));
us_facet->format("%m/%d/%Y");
std::cout << d1 << std::endl; // 10/01/2002
// English names, iso order (year-month-day), '-' separator
us_facet->format("%Y-%b-%d");
std::cout << d1 << std::endl; // 2002-Oct-01
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.date_period_calc"></a>Date Period Calculations</h3></div></div></div>
<p>
Calculates if a date is in an 'irregular' collection of periods using period calculation functions.
</p>
<pre class="programlisting">
/*
This example demonstrates a simple use of periods for the calculation
of date information.
The example calculates if a given date is a weekend or holiday
given an exclusion set. That is, each weekend or holiday is
entered into the set as a time interval. Then if a given date
is contained within any of the intervals it is considered to
be within the exclusion set and hence is a offtime.
Output:
Number Excluded Periods: 5
20020202/20020203
20020209/20020210
20020212/20020212
20020216/20020217
In Exclusion Period: 20020216 --> 20020216/20020217
20020223/20020224
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <set>
#include <algorithm>
#include <iostream>
typedef std::set<boost::gregorian::date_period> date_period_set;
//Simple population of the exclusion set
date_period_set
generateExclusion()
{
using namespace boost::gregorian;
date_period periods_array[] =
{ date_period(date(2002,Feb,2), date(2002,Feb,4)),//weekend of 2nd-3rd
date_period(date(2002,Feb,9), date(2002,Feb,11)),
date_period(date(2002,Feb,16), date(2002,Feb,18)),
date_period(date(2002,Feb,23), date(2002,Feb,25)),
date_period(date(2002,Feb,12), date(2002,Feb,13))//a random holiday 2-12
};
const int num_periods = sizeof(periods_array)/sizeof(date_period);
date_period_set ps;
//insert the periods in the set
std::insert_iterator<date_period_set> itr(ps, ps.begin());
std::copy(periods_array, periods_array+num_periods, itr );
return ps;
}
int main()
{
using namespace boost::gregorian;
date_period_set ps = generateExclusion();
std::cout << "Number Excluded Periods: " << ps.size() << std::endl;
date d(2002,Feb,16);
date_period_set::const_iterator i = ps.begin();
//print the periods, check for containment
for (;i != ps.end(); i++) {
std::cout << to_iso_string(*i) << std::endl;
//if date is in exclusion period then print it
if (i->contains(d)) {
std::cout << "In Exclusion Period: "
<< to_iso_string(d) << " --> " << to_iso_string(*i)
<< std::endl;
}
}
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.print_holidays"></a>Print Holidays</h3></div></div></div>
<p>
This is an example of using functors to define a holiday schedule
</p>
<pre class="programlisting">
/* Generate a set of dates using a collection of date generators
* Output looks like:
* Enter Year: 2002
* 2002-Jan-01 [Tue]
* 2002-Jan-21 [Mon]
* 2002-Feb-12 [Tue]
* 2002-Jul-04 [Thu]
* 2002-Sep-02 [Mon]
* 2002-Nov-28 [Thu]
* 2002-Dec-25 [Wed]
* Number Holidays: 7
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <algorithm>
#include <functional>
#include <vector>
#include <iostream>
#include <set>
void
print_date(boost::gregorian::date d)
{
using namespace boost::gregorian;
#if defined(BOOST_DATE_TIME_NO_LOCALE)
std::cout << to_simple_string(d) << " [" << d.day_of_week() << "]\n";
#else
std::cout << d << " [" << d.day_of_week() << "]\n";
#endif
}
int
main() {
std::cout << "Enter Year: ";
int year;
std::cin >> year;
using namespace boost::gregorian;
//define a collection of holidays fixed by month and day
std::vector<year_based_generator*> holidays;
holidays.push_back(new partial_date(1,Jan)); //Western New Year
holidays.push_back(new partial_date(4,Jul)); //US Independence Day
holidays.push_back(new partial_date(25, Dec));//Christmas day
//define a shorthand for the nth_day_of_the_week_in_month function object
typedef nth_day_of_the_week_in_month nth_dow;
//US labor day
holidays.push_back(new nth_dow(nth_dow::first, Monday, Sep));
//MLK Day
holidays.push_back(new nth_dow(nth_dow::third, Monday, Jan));
//Pres day
holidays.push_back(new nth_dow(nth_dow::second, Tuesday, Feb));
//Thanksgiving
holidays.push_back(new nth_dow(nth_dow::fourth, Thursday, Nov));
typedef std::set<date> date_set;
date_set all_holidays;
for(std::vector<year_based_generator*>::iterator it = holidays.begin();
it != holidays.end(); ++it)
{
all_holidays.insert((*it)->get_date(year));
}
//print the holidays to the screen
std::for_each(all_holidays.begin(), all_holidays.end(), print_date);
std::cout << "Number Holidays: " << all_holidays.size() << std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.print_month"></a>Print Month</h3></div></div></div>
<p>
Simple utility to print out days of the month with the days of a month. Demontstrates date iteration (date_time::date_itr).
</p>
<pre class="programlisting">
/* This example prints all the dates in a month. It demonstrates
* the use of iterators as well as functions of the gregorian_calendar
*
* Output:
* Enter Year: 2002
* Enter Month(1..12): 2
* 2002-Feb-01 [Fri]
* 2002-Feb-02 [Sat]
* 2002-Feb-03 [Sun]
* 2002-Feb-04 [Mon]
* 2002-Feb-05 [Tue]
* 2002-Feb-06 [Wed]
* 2002-Feb-07 [Thu]
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
int
main()
{
std::cout << "Enter Year: ";
int year, month;
std::cin >> year;
std::cout << "Enter Month(1..12): ";
std::cin >> month;
using namespace boost::gregorian;
try {
//Use the calendar to get the last day of the month
int eom_day = gregorian_calendar::end_of_month_day(year,month);
date endOfMonth(year,month,eom_day);
//construct an iterator starting with firt day of the month
day_iterator ditr(date(year,month,1));
//loop thru the days and print each one
for (; ditr <= endOfMonth; ++ditr) {
#if defined(BOOST_DATE_TIME_NO_LOCALE)
std::cout << to_simple_string(*ditr) << " ["
#else
std::cout << *ditr << " ["
#endif
<< ditr->day_of_week() << "]"
<< std::endl;
}
}
catch(std::exception& e) {
std::cout << "Error bad date, check your entry: \n"
<< " Details: " << e.what() << std::endl;
}
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.month_add"></a>Month Adding</h3></div></div></div>
<p>
Adding a month to a day without the use of iterators.
</p>
<pre class="programlisting">
/* Simple program that uses the gregorian calendar to progress by exactly
* one month, irregardless of how many days are in that month.
*
* This method can be used as an alternative to iterators
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include <iostream>
int
main()
{
using namespace boost::gregorian;
date d = day_clock::local_day();
add_month mf(1);
date d2 = d + mf.get_offset(d);
std::cout << "Today is: " << to_simple_string(d) << ".\n"
<< "One month from today will be: " << to_simple_string(d2)
<< std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.time_math"></a>Time Math</h3></div></div></div>
<p>
Various types of calculations with times and time durations.
</p>
<pre class="programlisting">
/* Some simple examples of constructing and calculating with times
* Output:
* 2002-Feb-01 00:00:00 - 2002-Feb-01 05:04:02.001000000 = -5:04:02.001000000
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
int
main()
{
using namespace boost::posix_time;
using namespace boost::gregorian;
date d(2002,Feb,1); //an arbitrary date
//construct a time by adding up some durations durations
ptime t1(d, hours(5)+minutes(4)+seconds(2)+millisec(1));
//construct a new time by subtracting some times
ptime t2 = t1 - hours(5)- minutes(4)- seconds(2)- millisec(1);
//construct a duration by taking the difference between times
time_duration td = t2 - t1;
std::cout << to_simple_string(t2) << " - "
<< to_simple_string(t1) << " = "
<< to_simple_string(td) << std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.print_hours"></a>Print Hours</h3></div></div></div>
<p>
Demonstrate time iteration, clock retrieval, and simple calculation.
</p>
<pre class="programlisting">
/* Print the remaining hours of the day
* Uses the clock to get the local time
* Use an iterator to iterate over the remaining hours
* Retrieve the date part from a time
*
* Expected Output something like:
*
* 2002-Mar-08 16:30:59
* 2002-Mar-08 17:30:59
* 2002-Mar-08 18:30:59
* 2002-Mar-08 19:30:59
* 2002-Mar-08 20:30:59
* 2002-Mar-08 21:30:59
* 2002-Mar-08 22:30:59
* 2002-Mar-08 23:30:59
* Time left till midnight: 07:29:01
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
int
main()
{
using namespace boost::posix_time;
using namespace boost::gregorian;
//get the current time from the clock -- one second resolution
ptime now = second_clock::local_time();
//Get the date part out of the time
date today = now.date();
date tommorrow = today + days(1);
ptime tommorrow_start(tommorrow); //midnight
//iterator adds by one hour
time_iterator titr(now,hours(1));
for (; titr < tommorrow_start; ++titr) {
std::cout << to_simple_string(*titr) << std::endl;
}
time_duration remaining = tommorrow_start - now;
std::cout << "Time left till midnight: "
<< to_simple_string(remaining) << std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.local_utc_conversion"></a>Local to UTC Conversion</h3></div></div></div>
<p>
Demonstrate utc to local and local to utc calculations including dst.
</p>
<pre class="programlisting">
/* Demonstrate conversions between a local time and utc
* Output:
*
* UTC <--> New York while DST is NOT active (5 hours)
* 2001-Dec-31 19:00:00 in New York is 2002-Jan-01 00:00:00 UTC time
* 2002-Jan-01 00:00:00 UTC is 2001-Dec-31 19:00:00 New York time
*
* UTC <--> New York while DST is active (4 hours)
* 2002-May-31 20:00:00 in New York is 2002-Jun-01 00:00:00 UTC time
* 2002-Jun-01 00:00:00 UTC is 2002-May-31 20:00:00 New York time
*
* UTC <--> Arizona (7 hours)
* 2002-May-31 17:00:00 in Arizona is 2002-Jun-01 00:00:00 UTC time
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include "boost/date_time/local_time_adjustor.hpp"
#include "boost/date_time/c_local_time_adjustor.hpp"
#include <iostream>
int
main()
{
using namespace boost::posix_time;
using namespace boost::gregorian;
//This local adjustor depends on the machine TZ settings-- highly dangerous!
typedef boost::date_time::c_local_adjustor<ptime> local_adj;
ptime t10(date(2002,Jan,1), hours(7));
ptime t11 = local_adj::utc_to_local(t10);
std::cout << "UTC <--> Zone base on TZ setting" << std::endl;
std::cout << to_simple_string(t11) << " in your TZ is "
<< to_simple_string(t10) << " UTC time "
<< std::endl;
time_duration td = t11 - t10;
std::cout << "A difference of: "
<< to_simple_string(td) << std::endl;
//eastern timezone is utc-5
typedef boost::date_time::local_adjustor<ptime, -5, us_dst> us_eastern;
ptime t1(date(2001,Dec,31), hours(19)); //5 hours b/f midnight NY time
std::cout << "\nUTC <--> New York while DST is NOT active (5 hours)"
<< std::endl;
ptime t2 = us_eastern::local_to_utc(t1);
std::cout << to_simple_string(t1) << " in New York is "
<< to_simple_string(t2) << " UTC time "
<< std::endl;
ptime t3 = us_eastern::utc_to_local(t2);//back should be the same
std::cout << to_simple_string(t2) << " UTC is "
<< to_simple_string(t3) << " New York time "
<< "\n\n";
ptime t4(date(2002,May,31), hours(20)); //4 hours b/f midnight NY time
std::cout << "UTC <--> New York while DST is active (4 hours)" << std::endl;
ptime t5 = us_eastern::local_to_utc(t4);
std::cout << to_simple_string(t4) << " in New York is "
<< to_simple_string(t5) << " UTC time "
<< std::endl;
ptime t6 = us_eastern::utc_to_local(t5);//back should be the same
std::cout << to_simple_string(t5) << " UTC is "
<< to_simple_string(t6) << " New York time "
<< "\n" << std::endl;
//Arizona timezone is utc-7 with no dst
typedef boost::date_time::local_adjustor<ptime, -7, no_dst> us_arizona;
ptime t7(date(2002,May,31), hours(17));
std::cout << "UTC <--> Arizona (7 hours)" << std::endl;
ptime t8 = us_arizona::local_to_utc(t7);
std::cout << to_simple_string(t7) << " in Arizona is "
<< to_simple_string(t8) << " UTC time "
<< std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.time_periods"></a>Time Periods</h3></div></div></div>
<p>
Demonstrate some simple uses of time periods.
</p>
<pre class="programlisting">
/* Some simple examples of constructing and calculating with times
* Returns:
* [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999]
* contains 2002-Feb-01 03:00:05
* [2002-Feb-01 00:00:00/2002-Feb-01 23:59:59.999999999]
* intersected with
* [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999]
* is
* [2002-Feb-01 00:00:00/2002-Feb-01 03:00:04.999999999]
*/
#include "boost/date_time/posix_time/posix_time.hpp"
#include <iostream>
using namespace boost::posix_time;
using namespace boost::gregorian;
//Create a simple period class to contain all the times in a day
class day_period : public time_period
{
public:
day_period(date d) : time_period(ptime(d),//midnight
ptime(d,hours(24)))
{}
};
int
main()
{
date d(2002,Feb,1); //an arbitrary date
//a period that represents a day
day_period dp(d);
ptime t(d, hours(3)+seconds(5)); //an arbitray time on that day
if (dp.contains(t)) {
std::cout << to_simple_string(dp) << " contains "
<< to_simple_string(t) << std::endl;
}
//a period that represents part of the day
time_period part_of_day(ptime(d, hours(0)), t);
//intersect the 2 periods and print the results
if (part_of_day.intersects(dp)) {
time_period result = part_of_day.intersection(dp);
std::cout << to_simple_string(dp) << " intersected with\n"
<< to_simple_string(part_of_day) << " is \n"
<< to_simple_string(result) << std::endl;
}
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.simple_time_zone"></a>Simple Time Zones</h3></div></div></div>
<p>
Example usage of custom_time_zone as well as posix_time_zone.
</p>
<pre class="programlisting">
/* A simple example for using a custom_time_zone and a posix_time_zone.
*/
#include "boost/date_time/local_time/local_time.hpp"
#include <iostream>
int
main()
{
using namespace boost;
using namespace local_time;
using namespace gregorian;
using posix_time::time_duration;
/***** custom_time_zone *****/
// create the dependent objects for a custom_time_zone
time_zone_names tzn("Eastern Standard Time", "EST",
"Eastern Daylight Time", "EDT");
time_duration utc_offset(-5,0,0);
dst_adjustment_offsets adj_offsets(time_duration(1,0,0),
time_duration(2,0,0),
time_duration(2,0,0));
// rules for this zone are:
// start on first Sunday of April at 2 am
// end on last Sunday of October at 2 am
// so we use a first_last_dst_rule
first_day_of_the_week_in_month start_rule(Sunday, Apr);
last_day_of_the_week_in_month end_rule(Sunday, Oct);
shared_ptr<dst_calc_rule> nyc_rules(new first_last_dst_rule(start_rule,
end_rule));
// create more dependent objects for a non-dst custom_time_zone
time_zone_names tzn2("Mountain Standard Time", "MST",
"", ""); // no dst means empty dst strings
time_duration utc_offset2(-7,0,0);
dst_adjustment_offsets adj_offsets2(time_duration(0,0,0),
time_duration(0,0,0),
time_duration(0,0,0));
// no dst means we need a null pointer to the rules
shared_ptr<dst_calc_rule> phx_rules;
// create the custom_time_zones
time_zone_ptr nyc_1(new custom_time_zone(tzn, utc_offset,
adj_offsets, nyc_rules));
time_zone_ptr phx_1(new custom_time_zone(tzn2, utc_offset2,
adj_offsets2, phx_rules));
/***** posix_time_zone *****/
// create posix_time_zones that are the duplicates of the
// custom_time_zones created above. See posix_time_zone documentation
// for details on full zone names.
std::string nyc_string, phx_string;
nyc_string = "EST-05:00:00EDT+01:00:00,M4.1.0/02:00:00,M10.5.0/02:00:00";
// nyc_string = "EST-05EDT,M4.1.0,M10.5.0"; // shorter when defaults used
phx_string = "MST-07"; // no-dst
time_zone_ptr nyc_2(new posix_time_zone(nyc_string));
time_zone_ptr phx_2(new posix_time_zone(phx_string));
/***** show the sets are equal *****/
std::cout << "The first zone is in daylight savings from:\n "
<< nyc_1->dst_local_start_time(2004) << " through "
<< nyc_1->dst_local_end_time(2004) << std::endl;
std::cout << "The second zone is in daylight savings from:\n "
<< nyc_2->dst_local_start_time(2004) << " through "
<< nyc_2->dst_local_end_time(2004) << std::endl;
std::cout << "The third zone (no daylight savings):\n "
<< phx_1->std_zone_abbrev() << " and "
<< phx_1->base_utc_offset() << std::endl;
std::cout << "The fourth zone (no daylight savings):\n "
<< phx_2->std_zone_abbrev() << " and "
<< phx_2->base_utc_offset() << std::endl;
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.calc_rules"></a>Daylight Savings Calc Rules</h3></div></div></div>
<p>
Example of creating various Daylight Savings Calc Rule objects.
</p>
<pre class="programlisting">
/* A simple example for creating various dst_calc_rule instances
*/
#include "boost/date_time/gregorian/gregorian.hpp"
#include "boost/date_time/local_time/local_time.hpp"
#include <iostream>
int
main()
{
using namespace boost;
using namespace local_time;
using namespace gregorian;
/***** create the necessary date_generator objects *****/
// starting generators
first_day_of_the_week_in_month fd_start(Sunday, May);
last_day_of_the_week_in_month ld_start(Sunday, May);
nth_day_of_the_week_in_month nkd_start(nth_day_of_the_week_in_month::third,
Sunday, May);
partial_date pd_start(1, May);
// ending generators
first_day_of_the_week_in_month fd_end(Sunday, Oct);
last_day_of_the_week_in_month ld_end(Sunday, Oct);
nth_day_of_the_week_in_month nkd_end(nth_day_of_the_week_in_month::third,
Sunday, Oct);
partial_date pd_end(31, Oct);
/***** create the various dst_calc_rule objects *****/
dst_calc_rule_ptr pdr(new partial_date_dst_rule(pd_start, pd_end));
dst_calc_rule_ptr flr(new first_last_dst_rule(fd_start, ld_end));
dst_calc_rule_ptr llr(new last_last_dst_rule(ld_start, ld_end));
dst_calc_rule_ptr nlr(new nth_last_dst_rule(nkd_start, ld_end));
dst_calc_rule_ptr ndr(new nth_day_of_the_week_in_month_dst_rule(nkd_start,
nkd_end));
return 0;
}
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.flight"></a>Flight Time Example</h3></div></div></div>
<p>This example shows a program that calculates the arrival time of a plane that flys from Phoenix to New York. During the flight New York shifts into daylight savings time (Phoenix doesn't because Arizona doesn't use dst).</p>
<pre class="programlisting">
<code class="literal">
<span class="preprocessor">#include</span><span class="string"> "boost/date_time/local_time/local_time.hpp"</span><span class="preprocessor">
#include</span><span class="special"> <</span><span class="identifier">iostream</span><span class="special">></span><span class="comment">
/* This example shows a program that calculates the arrival time of a plane
* that flys from Phoenix to New York. During the flight New York shifts
* into daylight savings time (Phoenix doesn't because Arizona doesn't use
* dst).
*
*
*/</span><span class="keyword">
int</span><span class="identifier"> main</span><span class="special">()</span><span class="special">
{</span><span class="keyword">
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">gregorian</span><span class="special">;</span><span class="keyword">
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">local_time</span><span class="special">;</span><span class="keyword">
using</span><span class="keyword"> namespace</span><span class="identifier"> boost</span><span class="special">::</span><span class="identifier">posix_time</span><span class="special">;</span><span class="comment">
//setup some timezones for creating and adjusting local times
//This user editable file can be found in libs/date_time/data.
</span><span class="identifier"> tz_database</span><span class="identifier"> tz_db</span><span class="special">;</span><span class="identifier">
tz_db</span><span class="special">.</span><span class="identifier">load_from_file</span><span class="special">(</span><span class="string">"date_time_zonespec.csv"</span><span class="special">);</span><span class="identifier">
time_zone_ptr</span><span class="identifier"> nyc_tz</span><span class="special"> =</span><span class="identifier"> tz_db</span><span class="special">.</span><span class="identifier">time_zone_from_region</span><span class="special">(</span><span class="string">"America/New_York"</span><span class="special">);</span><span class="comment">
//Use a
</span><span class="identifier"> time_zone_ptr</span><span class="identifier"> phx_tz</span><span class="special">(</span><span class="keyword">new</span><span class="identifier"> posix_time_zone</span><span class="special">(</span><span class="string">"MST-07:00:00"</span><span class="special">));</span><span class="comment">
//local departure time in phoenix is 11 pm on april 2 2005
// (ny changes to dst on apr 3 at 2 am)
</span><span class="identifier"> local_date_time</span><span class="identifier"> phx_departure</span><span class="special">(</span><span class="identifier">date</span><span class="special">(</span><span class="number">2005</span><span class="special">,</span><span class="identifier"> Apr</span><span class="special">,</span><span class="number"> 2</span><span class="special">),</span><span class="identifier"> hours</span><span class="special">(</span><span class="number">23</span><span class="special">),</span><span class="identifier">
phx_tz</span><span class="special">,</span><span class="identifier">
local_date_time</span><span class="special">::</span><span class="identifier">NOT_DATE_TIME_ON_ERROR</span><span class="special">);</span><span class="identifier">
time_duration</span><span class="identifier"> flight_length</span><span class="special"> =</span><span class="identifier"> hours</span><span class="special">(</span><span class="number">4</span><span class="special">)</span><span class="special"> +</span><span class="identifier"> minutes</span><span class="special">(</span><span class="number">30</span><span class="special">);</span><span class="identifier">
local_date_time</span><span class="identifier"> phx_arrival</span><span class="special"> =</span><span class="identifier"> phx_departure</span><span class="special"> +</span><span class="identifier"> flight_length</span><span class="special">;</span><span class="identifier">
local_date_time</span><span class="identifier"> nyc_arrival</span><span class="special"> =</span><span class="identifier"> phx_arrival</span><span class="special">.</span><span class="identifier">local_time_in</span><span class="special">(</span><span class="identifier">nyc_tz</span><span class="special">);</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "departure phx time: "</span><span class="special"> <<</span><span class="identifier"> phx_departure</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "arrival phx time: "</span><span class="special"> <<</span><span class="identifier"> phx_arrival</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="identifier">
std</span><span class="special">::</span><span class="identifier">cout</span><span class="special"> <<</span><span class="string"> "arrival nyc time: "</span><span class="special"> <<</span><span class="identifier"> nyc_arrival</span><span class="special"> <<</span><span class="identifier"> std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span><span class="special">
}</span>
</code>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="date_time.examples.seconds_since_epoch"></a>Seconds Since Epoch</h3></div></div></div>
<p>
Example of calculating seconds elapsed since epoch (1970-Jan-1) using local_date_time.
</p>
<pre class="programlisting">
/* This example demonstrates the use of the time zone database and
* local time to calculate the number of seconds since the UTC
* time_t epoch 1970-01-01 00:00:00. Note that the selected timezone
* could be any timezone supported in the time zone database file which
* can be modified and updated as needed by the user.
*
* To solve this problem the following steps are required:
* 1) Get a timezone from the tz database for the local time
* 2) Construct a local time using the timezone
* 3) Construct a posix_time::ptime for the time_t epoch time
* 4) Convert the local_time to utc and subtract the epoch time
*
*/
#include "boost/date_time/local_time/local_time.hpp"
#include <iostream>
int main()
{
using namespace boost::gregorian;
using namespace boost::local_time;
using namespace boost::posix_time;
tz_database tz_db;
try {
tz_db.load_from_file("../data/date_time_zonespec.csv");
}catch(data_not_accessible dna) {
std::cerr << "Error with time zone data file: " << dna.what() << std::endl;
exit(EXIT_FAILURE);
}catch(bad_field_count bfc) {
std::cerr << "Error with time zone data file: " << bfc.what() << std::endl;
exit(EXIT_FAILURE);
}
time_zone_ptr nyc_tz = tz_db.time_zone_from_region("America/New_York");
date in_date(2004,10,04);
time_duration td(12,14,32);
// construct with local time value
// create not-a-date-time if invalid (eg: in dst transition)
local_date_time nyc_time(in_date,
td,
nyc_tz,
local_date_time::NOT_DATE_TIME_ON_ERROR);
std::cout << nyc_time << std::endl;
ptime time_t_epoch(date(1970,1,1));
std::cout << time_t_epoch << std::endl;
// first convert nyc_time to utc via the utc_time()
// call and subtract the ptime.
time_duration diff = nyc_time.utc_time() - time_t_epoch;
//Expected 1096906472
std::cout << "Seconds diff: " << diff.total_seconds() << std::endl;
}
</pre>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2001-2005 CrystalClear Software, Inc<p>Subject to the Boost Software License, Version 1.0. (See accompanying file
<code class="filename">LICENSE_1_0.txt</code> or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)</p>
</div></td>
</tr></table>
<hr>
<div class="spirit-nav">
<a accesskey="p" href="details.html"><img src="../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../date_time.html"><img src="../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="doxy.html"><img src="../../../doc/src/images/next.png" alt="Next"></a>
</div>
</body>
</html>
|
