#include <stdio.h>
#include <time.h>

int main(void)
{
  time_t t;

  t = time(NULL);

  printf("Current date is %s", ctime(&t));

  t -= 24L*60L*60L;  /* Back up to same time previous day */

  stime(&t);
  printf("\nNew date is %s", ctime(&t));

   getch();
   return 0;
}

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