#include <stdlib.h>
#include <time.h>
#include <errno.h>

int main()
{
  struct tm tm;
  tm.tm_year = 3000; tm.tm_mon = 0; tm.tm_mday = 0;
  tm.tm_hour = 0; tm.tm_min = 0; tm.tm_sec = 0; tm.tm_isdst = 01;
  mktime(&tm);
  exit(errno == 0);
}