1/* Copyright (C) 1991-2022 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <time.h>
21
22
23int
24main (int argc, char **argv)
25{
26 time_t t;
27 struct tm *tp;
28 struct tm tbuf;
29 int lose = 0;
30
31 --argc;
32 ++argv;
33
34 do
35 {
36 char buf[BUFSIZ];
37 if (argc > 0)
38 {
39 static char buf[BUFSIZ];
40 sprintf(buf, "TZ=%s", *argv);
41 if (putenv(string: buf))
42 {
43 puts(s: "putenv failed.");
44 lose = 1;
45 }
46 else
47 puts (s: buf);
48 }
49 tzset();
50 tbuf.tm_year = 72;
51 tbuf.tm_mon = 0;
52 tbuf.tm_mday = 31;
53 tbuf.tm_hour = 6;
54 tbuf.tm_min = 14;
55 tbuf.tm_sec = 50;
56 tbuf.tm_isdst = -1;
57 doit:;
58 t = mktime(&tbuf);
59 if (t == (time_t) -1)
60 {
61 puts(s: "mktime() failed?");
62 lose = 1;
63 }
64 tp = localtime(&t);
65 if (tp == NULL)
66 {
67 puts(s: "localtime() failed.");
68 lose = 1;
69 }
70 else if (strftime (buf, sizeof (buf), "%a %b %d %X %Z %Y", tp) == 0)
71 {
72 puts(s: "strftime() failed.");
73 lose = 1;
74 }
75 else
76 puts(s: buf);
77 if (tbuf.tm_year == 101)
78 {
79 tbuf.tm_year = 97;
80 tbuf.tm_mon = 0;
81 goto doit;
82 }
83 ++argv;
84 } while (--argc > 0);
85
86 {
87#define SIZE 256
88 char buffer[SIZE];
89 time_t curtime;
90 struct tm *loctime;
91
92 curtime = time (NULL);
93
94 loctime = localtime (&curtime);
95
96 fputs (asctime (loctime), stdout);
97
98 strftime (buffer, SIZE, "Today is %A, %B %d.\n", loctime);
99 fputs (buffer, stdout);
100 strftime (buffer, SIZE, "The time is %I:%M %p.\n", loctime);
101 fputs (buffer, stdout);
102
103 loctime->tm_year = 72;
104 loctime->tm_mon = 8;
105 loctime->tm_mday = 12;
106 loctime->tm_hour = 20;
107 loctime->tm_min = 49;
108 loctime->tm_sec = 05;
109 curtime = mktime (loctime);
110 strftime (buffer, SIZE, "%D %T was %w the %jth.\n", loctime);
111 fputs (buffer, stdout);
112 }
113
114 return (lose ? EXIT_FAILURE : EXIT_SUCCESS);
115}
116

source code of glibc/time/test_time.c