顯示時間值

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

main()
{
  time_t now;
  char *cnow;
  struct tm *stime;
  time_t nnow;
  time_t mnow;
  time_t daystart;

  now = time(NULL);
  printf("time(NULL) = %d\n",now);

  cnow = ctime(&now);
  printf("ctime(&now) = %s",cnow);

  stime = localtime(&now);
  printf("stime : tm_sec = %d, tm_min = %d, tm_hour = %d, tm_mday = %d, tm_mon = %d, tm_year = %d\n",stime->tm_sec,stime->tm_min,stime->tm_hour,stime->tm_mday,stime->tm_mon,stime->tm_year);

  nnow = mktime(stime);
  printf("nnow = %d\n",nnow);

  stime->tm_hour = 0;
  stime->tm_min = 0;
  stime->tm_sec = 0;

  mnow = mktime(stime);
  printf("mnow = %d\n",mnow);
}