unix timestamp - time_t

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

void main (void)
{
  time_t secs;

  seconds = time(NULL);
  printf("secs ~ from January 1, 1970 to now  = %ld", secs);
  
  return;
}

輸出: 1363069211

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

void main(void)  
{  
    time_t t;  
    struct tm *t_tm;  
    t=1363069211 or time(&t) //system time;  
    t_tm=gmtime(&t);  
    char date[128];  
    strftime(date, sizeof(date), "%Y-%m-%d %H:%M:%S", t_tm);  
    printf("%d: %s\n", (int)t, date);  
    return;  
}  

輸出: 1363069211: 2013-03-12 06:20:11 (差 +8 時區)

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

void main(void)  
{  
    time_t start, end;
    start = time(NULL);
    usleep(1200*1000);
    end = time(NULL);
    printf("end - start =%ld\n", end - start);
    return;  
} 

輸出: end - start = 1 (精準度只能到秒...)


一天的秒數: 86400