Question

I’m using RHEL 5.3 (linux 2.6.18)

I have a legacy code that relies on timezone and dst returned by ftime(3).

Now from ftime(3) man pages I see that timezone and dstflag are not supported.
Also in gettimeofday(3) those fields are not supported.

How I can retrieve timezone and dst?

Thanks

Answer 1

You can use tzset(3):

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

int main(void)
{
    tzset();
    printf("%ld, %d\n", timezone, daylight);
}

Which on my system prints “-3600, 1”.

tzset also fills the array char *tzname[2] with the names of the standard and daylight saving time timezone names.