C code to get local time offset in minutes relative to UTC?

Question

I didn\'t find a trivial way to get the time offset in minutes between the local time and the UTC time.

At first I intended to use tzset() but it doesn\'t p

Answer 1

This C code computes the local time offset in minutes relative to UTC. It assumes that DST is always one hour offset.

#include 
#include 

int main()
{
    time_t rawtime = time(NULL);
    struct tm *ptm = gmtime(&rawtime);
    time_t gmt = mktime(ptm);
    ptm = localtime(&rawtime);
    time_t offset = rawtime - gmt + (ptm->tm_isdst ? 3600 : 0);

    printf("%i\n", (int)offset);
}

It uses gmtime and localtime though. Why don't you want to use those functions?