linux c获得时间和设置时间函数

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我是靠谱客的博主温柔心锁，最近开发中收集的这篇文章主要介绍linux c获得时间和设置时间函数，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

#include<time.h>
#include <sys/time.h>
#include<stdio.h>
//gcc -o systime systime.c
int getSystemTime()
{
    time_t timer;
    struct tm t_tm;
    time(&timer);
    localtime_r(&timer, &t_tm);
    printf("today is %4d/%02d/%02d %02d:%02d:%02drn", t_tm.tm_year+1900,
    t_tm.tm_mon+1, t_tm.tm_mday, t_tm.tm_hour, t_tm.tm_min, t_tm.tm_sec);
    return 0;
}

/************************************************
设置操作系统时间
参数:*dt数据格式为"2006-4-20 20:30:30"
调用方法:
    char *pt="2006-4-20 20:30:30";
    SetSystemTime(pt);
**************************************************/
int SetSystemTime(void)
{
    struct tm rtc_time;
    struct tm _tm;
    struct timeval tv;
    time_t timep;
   char dt[128];
   printf("Input date, format: 2006-4-20 20:30:30rn");
   fgets(dt, 128, stdin);
   printf("Your input is %srn", dt);
    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;
}

void Usage(void)
{
    printf("    -h, helpn"
        "    -s, set systimen"
        "    -g, get systiemn");
}

int main(int argc, char *argv[])
{
    int s32Ret;
    if (argc < 2)
    {
        Usage();
        return -1;
    }
   int count;
   for(count = 1; count < argc; count++)
    {
        if(!strcmp(argv[count], "-h"))
        {
            Usage();
            return 0;
        }
        else if(!strcmp(argv[count], "-s"))
        {
           s32Ret = SetSystemTime();
           if(0 == s32Ret)
           {
               printf("Set system datatime OK!rn");
               return 0;
           }
           else
           {
               return 0;
           }
        }
        else if(!strcmp(argv[count], "-g"))
        {
            getSystemTime();
        }

    }

   return 0;
}