#define _XOPEN_SOURCE
#include "stdio.h"
#include "stdlib.h"
#include "time.h"
#include "string.h"


int main(void) {
  char buf[100];
  struct tm tm1, tm2;
  memset(&tm1, 0, sizeof(struct tm));
  memset(&tm2, 0, sizeof(struct tm));
  strptime("1/1/1970 00:00:00", "%d/%m/%Y %H:%M:%S", &tm1);
  strptime("1/1/1970 00:00:00", "%d/%m/%Y %H:%M:%S", &tm2);

  strftime(buf, 100, "%s", &tm1);
  printf("strftime: %s\n", buf);

  time_t seg = mktime(&tm2);
  printf("mktime: %ld\n", seg);

  return 0;
}