Linux系统编程_5_获取系统时间

Linux环境中时间编程函数：

比较常用的是ctime与localtime

char *ctime(const time_t *timep);

char *ctime_r(const time_t *timep, char *buf);

struct tm *localtime(const time_t *timep);

struct tm *localtime_r(const time_t *timep, struct tm *result);

Linux环境中时间编程结构体：

struct tm
 {
               int tm_sec;         /* seconds */
               int tm_min;         /* minutes */
               int tm_hour;        /* hours */
               int tm_mday;        /* day of the month */
               int tm_mon;         /* month */
               int tm_year;        /* year */
               int tm_wday;        /* day of the week */
               int tm_yday;        /* day in the year */
               int tm_isdst;       /* daylight saving time */
 };

Linux系统中获取系统当前时间的两种方法比较：

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

int main()
{
    time_t nTime;
    struct tm *stTime;
    char *str;

    str = ctime(&nTime);
    printf("Time: %s\n", str);

    time(&nTime);
    stTime = localtime(&nTime);
    printf("Current Time: %d:%d:%d,%d:%d:%d\n", stTime->tm_year+1900, stTime->tm_mon, stTime->tm_mday,
            stTime->tm_hour, stTime->tm_min, stTime->tm_sec);

    return 0;
}

打印：

Time: Sun Apr  7 04:47:40 1974

Current Time: 2014:10:15,15:39:44

注意，两种方法输出时间不一样