Linux下C语言实现获取当前时间

C语言获取当前时间

简介

在工作中，经常涉及到获取当前时间，用于写日志，基于此，今特意利用C语言写一个获取时间函数，用于后面用到时，能够及时查到。获取当前时间，要用到time.h中的time()和localtime()函数，二者具体介绍与使用，参见 https://blog.csdn.net/yzhang6_10/article/details/51583894

具体实现

程序实现

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

void gettime(char *cur_time) {
        char Year[6] = {0};
        char Month[4] = {0};
        char Day[4] = {0};
        char Hour[4] = {0};
        char Min[4] = {0};
        char Sec[4] = {0};

        time_t current_time;
        struct tm* now_time;
        time(&current_time);
        now_time = localtime(&current_time);

        strftime(Year, sizeof(Year), "%Y-", now_time);
        strftime(Month, sizeof(Month), "%m-", now_time);
        strftime(Day, sizeof(Day), "%d ", now_time);
        strftime(Hour, sizeof(Hour), "%H:", now_time);
        strftime(Min, sizeof(Min), "%M:", now_time);
        strftime(Sec, sizeof(Sec), "%S", now_time);

        strncat(cur_time, Year, 5);
        strncat(cur_time, Month, 3);
        strncat(cur_time, Day, 3);
        strncat(cur_time, Hour, 3);
        strncat(cur_time, Min, 3);
        strncat(cur_time, Sec, 3);
}

int main() {
        char *cur_time = (char *)malloc(21*sizeof(char));
        gettime(cur_time);
        printf("Current time: %s\n", cur_time);
        free(cur_time);
        cur_time = NULL;
        return 0;
}

程序编译： g++ test_time.cpp -o test_time

程序执行结果：Current time: 2018-08-08 00:11:31