localtime、localtime_s、localtime_r的使用

（1）、localtime用来获取系统时间，精度为秒

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

int main()
{
    time_t time_seconds = time(0);
    struct tm* now_time = localtime(&time_seconds);

    printf("%d-%d-%d %d:%d:%d\n", now_time->tm_year + 1900, now_time->tm_mon + 1,
        now_time->tm_mday, now_time->tm_hour, now_time->tm_min,
        now_time->tm_sec);
}#include <stdio