linux 通过系统函数设置系统时间

我们都熟悉用date来设置系统时间，下面我来介绍下通过系统函数设置系统时间

 

#include 
#include
#include
#include 


int SetSystemTime(char *dt)
{
    struct tm rtc_time;
    struct tm _tm;
    struct timeval tv;
    time_t timep;
    sscanf(dt, "%d-%d-%d %d:%d:%d", &rtc_time.tm_year,
        &rtc_time.tm_mon, &rtc_time.tm_mday,&rtc_time.tm_hour,
        &rtc_time.tm_min, &rtc_time.tm_sec);
    _tm.tm_sec = rtc_time.tm_sec;
    _tm.tm_min = rtc_time.tm_min;
    _tm.tm_hour = rtc_time.tm_hour;
    _tm.tm_mday = rtc_time.tm_mday;
    _tm.tm_mon = rtc_time.tm_mon - 1;
    _tm.tm_year = rtc_time.tm_year - 1900;

    timep = mktime(&_tm);
    tv.tv_sec = timep;
    tv.tv_usec = 0;
    if(settimeofday (&tv, (struct timezone *) 0) < 0)
    {
        printf("Set system datatime error!/n");
        return -1;
    }
    return 0;
}


int main()
{
  SetSystemTime("2006-4-20 20:30:30");

  return 0;
}