A small reminder to self how to convert seconds since the epoch to GM time.

ephoc2gmt.c

#define _XOPEN_SOURCE
#include <string.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>

// in main()

int
main(void)
{
   struct tm *tim;
   setlocale(LC_ALL, "");
   char buf[255];
   time_t c;
   
   c = strtoul("1412200800", NULL, 0);
   tim = localtime(&c);
   strftime(buf, sizeof(buf), "%c" , tim);
   puts(buf);
   printf("%s %s\n", tzname[0], tzname[1]);
   tim = gmtime(&c);
   strftime(buf, sizeof(buf), "%c" , tim);
   puts(buf);
   exit(EXIT_SUCCESS);
}