test_strftime_2039.c revision 319ea244ab117bfa519ec4fb176e5b42a5710458 
1/* this tests tries to call strftime() with a date > 2038
2 * to see if it works correctly.
3 */
4#include <time.h>
5#include <stdio.h>
6#include <stdlib.h>
7
8int  main(void)
9{
10    char        buff[256];
11    time_t      now = time(NULL);
12    struct tm   tm  = *localtime(&now);
13
14    tm.tm_year = 2039 - 1900;
15
16    /* "%s" is the number of seconds since the epoch */
17    if (strftime(buff, sizeof buff, "%s", &tm) == 0) {
18        fprintf(stderr, "strftime() returned 0\n");
19        exit(EXIT_FAILURE);
20    }
21    printf("seconds since epoch: %s\n", buff);
22
23    /* a 32-bit limited implementation will return a negative number */
24    if (buff[0] == '-') {
25        fprintf(stderr, "FAIL\n");
26        exit(EXIT_FAILURE);
27    }
28
29    /* "%c" is the usual date string for the current locale */
30    if (strftime(buff, sizeof buff, "%c", &tm) == 0) {
31        fprintf(stderr, "strftime() returned 0\n");
32        exit(EXIT_FAILURE);
33    }
34    printf("date string        : %s\n", buff);
35    return 0;
36}
37