获取当前时间字符串的方法

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

static void get_format_time_string(time_t time, char* format, char *buf) 
{
    if (buf == NULL) {
        return;
    }
    struct tm mytm={0};
    struct tm* p_tm = localtime_r(&time,&mytm);
    if (p_tm == NULL) {
        return;
    }
    sprintf(buf, format, p_tm->tm_hour, p_tm->tm_min, p_tm->tm_sec,  p_tm->tm_mon + 1, p_tm->tm_mday, p_tm->tm_year + 1900);
}

static void get_compact_time_string(time_t time, char* buf) {
    get_format_time_string(time, "%02d:%02d:%02d %02d-%02d-%4d", buf);
}

测试用例

int main()
{
    char time_buf[15]={0};
    get_compact_time_string(time(NULL), time_buf);
    printf("time_string=%s\n", time_buf);
    return 0;
}

运行结果

$ gcc time_demo.c -o time
$ ./time
time string=18:50:22 01-27-2022