time_t和struct tm之间的转换

time_t到struct tm的转换：

#include 
struct tm *localtime(const time_t *timep);

struct tm到time_t的转换：

#include 
time_t mktime(struct tm *tm);

time_t timep = time(NULL);可以获得从此刻距1970-01-01 00:00:00 +0000 (UTC)时间点的秒数。

示例程序；

#include 
#include 
#include 

int main (int argc, char **argv)
{
    int i;
    time_t timer[4];
    struct tm tm, *p;


    tm.tm_year = 2015;
    tm.tm_mon = 2;
    tm.tm_mday = 23;
    tm.tm_hour = 8;
    tm.tm_min = 22;
    tm.tm_sec = 0;
    for(i = 0; i < 4; i++){
        timer[i] = mktime(&tm);
        printf ("timer[%d] = %ld\n", i, timer[i]);
        p = localtime(&timer[i]);
        printf("%d-%d-%d-%d-%d-%d\n",
                p->tm_year,
                p->tm_mon,
                p->tm_mday,
                p->tm_hour,
                p->tm_min,
                p->tm_sec);
    }


    return 0;
} /* ----- End of main() ----- */

by fulinux

blog: blog.csdn.net/fulinus