函数名: time
功  能: 取一天的时间
用  法: logn time(long *tloc);
程序例:

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

int main(void)
{
   time_t t;

   t = time(NULL);
   printf("The number of seconds since January 1, 1970 is %ld",t);
   return 0;
}

函数名: getdate
功  能: 取DOS日期
用  法: void getdate(struct *dateblk);
程序例:

#include <dos.h>
#include <stdio.h>

int main(void)
{
   struct date d;

   getdate(&d);
   printf("The current year is: %d\n",
   d.da_year);
   printf("The current day is: %d\n",
   d.da_day);
   printf("The current month is: %d\n",
   d.da_mon);
   return 0;
}
  

函数名: gettime
功  能: 取得系统时间
用  法: void gettime(struct time *timep);
程序例:

#include   <stdio.h>
#include   <dos.h>

int main(void)
{
   struct  time t;

   gettime(&t);
   printf("The current time is: %2d:%02d:%02d.%02d\n",
          t.ti_hour, t.ti_min, t.ti_sec, t.ti_hund);
   return 0;
}
  
  

函数名: gmtime
功  能: 把日期和时间转换为格林尼治标准时间(GMT)
用  法: struct tm *gmtime(long *clock);
程序例:

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

/* Pacific Standard Time & Daylight Savings */
char *tzstr = "TZ=PST8PDT";

int main(void)
{
   time_t t;
   struct tm *gmt, *area;

   putenv(tzstr);
   tzset();

   t = time(NULL);
   area = localtime(&t);
   printf("Local time is: %s", asctime(area));
   gmt = gmtime(&t);
   printf("GMT is:        %s", asctime(gmt));
   return 0;
}
  

VC里还可用MFC的CTIME，也很方便的

我对lanjingquan大虾的回复很满意

请教一下哈，DOS.H是什么库函数？偶是初学者。

函数名: stime
功  能: 设置时间
用  法: int stime(long *tp);
程序例:

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

int main(void)
{
   time_t t;
   struct tm *area;

   t = time(NULL);
   area = localtime(&t);
   printf("Number of seconds since 1/1/1970 is: %ld\n", t);
   printf("Local time is: %s", asctime(area));

   t++;
   area = localtime(&t);
   printf("Add a second:  %s", asctime(area));

   t += 60;
   area = localtime(&t);
   printf("Add a minute:  %s", asctime(area));

   t += 3600;
   area = localtime(&t);
   printf("Add an hour:   %s", asctime(area));

   t += 86400L;
   area = localtime(&t);
   printf("Add a day:     %s", asctime(area));

   t += 2592000L;
   area = localtime(&t);
   printf("Add a month:   %s", asctime(area));

   t += 31536000L;
   area = localtime(&t);
   printf("Add a year:    %s", asctime(area));
   return 0;
}

函数名: dostounix
功  能: 转换日期和时间为UNIX时间格式
用  法: long dostounix(struct date *dateptr, struct time *timeptr);
程序例:

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

int main(void)
{
    time_t t;
    struct time d_time;
    struct date d_date;
    struct tm *local;

    getdate(&d_date);
    gettime(&d_time);

    t = dostounix(&d_date, &d_time);
    local = localtime(&t);
    printf("Time and Date: %s\n", \
    asctime(local));

    return 0;
}