C/time.h/mktime

    
//Declaration:  time_t mktime(struct tm *time); 
 
  

  #include <time.h>
  #include <stdio.h>
  int main(void)
  {
    struct tm t;
    time_t t_of_day;
    t.tm_year = 2005-1900;
    t.tm_mon = 0;
    t.tm_mday = 3;
    t.tm_hour = 0;  /* hour, min, sec don"t matter */
    t.tm_min = 0;   /* as long as they don"t cause a */
    t.tm_sec = 1;   /* new day to occur */
    t.tm_isdst = 0;
    t_of_day = mktime(&t);
    printf(ctime(&t_of_day));
    return 0;
  }
         
/*
Mon Jan  3 00:00:01 2005
*/