#include <stdio.h>
#include <sys/types.h>
#include <time.h>
#include <math.h>

void main() {
  short delta_year;
  time_t now, then;
  char *ctime_str, *gmtime_str;
  now = time(0);

  then = (time_t)(2147483648-3601);
  ctime_str = ctime(&then);
  printf("ctime(%ld) == %s\n", (long)then, ctime_str);
  
  then = (time_t)(2147483648-3600);
  ctime_str = ctime(&then);
  printf("ctime(%ld) == %s\n", (long)then, ctime_str);
  
  for(delta_year=0 ; delta_year < 50; delta_year++ ) {
    then = now + (long)(delta_year*60*60*24*365.2422);
    printf("Year : %4.4d (time == %ld)\n",
	   1997+delta_year, (long)then);
    ctime_str = ctime(&then);
    gmtime_str = asctime(gmtime(&then));
    printf("  ctime == %s  gmtime == %s\n",
	   ctime_str, gmtime_str);
  }
}