libtz/README at master · nullie/libtz · GitHub

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Library for handling time in different timezones. Based on Arthur David Olson tzcode.

Usage:

    #include <tz.h>

    const struct state * sp = tz_alloc("Asia/Yekaterinburg");

    struct tm st = {0, 0, 0, 1, 0, 112};

    time_t t = timegm(&st);

    // {0, 0, 6, 1, 0, 112}
    struct tm * bt = tz_localtime(sp, &t);

    struct tm st2 = {0, 0, 0, 1, 0, 111, 0, 0, 0};

    t = timegm(&st2);

    // {0, 0, 5, 1, 0, 111}
    bt = tz_localtime(sp, &t);

    struct tm st3 = {0, 30, 22, 15, 10, 111};

    time_t t = tz_mktime(sp, &st);

    // {0, 30, 16, 15, 10, 111}
    struct tm * bt = gmtime(&t);

    struct tm st4 = {0, 30, 22, 15, 10, 110};

    t = tz_mktime(sp, &st4);

    // {0, 30, 17, 15, 10, 110}
    bt = gmtime(&t);

    tz_free(sp);