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- #include <stdio.h>
- #include <time.h>
- #include <stdlib.h>
-
- const char *weekday[] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun" };
-
- void
- print(const char *msg, struct tm *t)
- {
- printf("%s %2d:%02d %s\n", msg, t->tm_hour, t->tm_min, weekday[t->tm_wday]);
- }
-
- int
- main(void)
- {
- const char *d;
- time_t now;
- struct tm l, g;
-
- printf("TZ = %s\n", getenv("TZ") ? : "(unset)");
-
- time(&now);
- l = *localtime(&now);
- g = *gmtime(&now);
-
- print("Local time: ", &l);
- print("GMT time: ", &g);
-
- d = "East";
- if (l.tm_gmtoff < 0)
- {
- l.tm_gmtoff = -l.tm_gmtoff;
- d = "West";
- }
-
- printf("%s of GMT by %d:%02d (%s)\n",
- d,
- l.tm_gmtoff / 3600,
- (l.tm_gmtoff / 60) % 60,
- l.tm_zone);
-
- return 0;
- }
-