#include <time.h>
#include <stdio.h>

int
main(void)
{
    time_t now = time(0);
    char buf[1024];
    struct tm *t = localtime(&now);
    int gmtoff = t->tm_gmtoff / 60;
    printf("tm_gmtoff = %+03d%02d, tm_zone = %s\n", gmtoff / 60, gmtoff % 60, t->tm_zone);
    strftime(buf, sizeof(buf), "tm_gmtoff = %z, tm_zone = %Z\n", t);
    fputs(buf, stdout);
    return 0;
}