linux获取系统时间程序

date

Tue Sep 21 14:23:45 UTC 2021

date +"%Y-%m-%d %H:%M:%S"

2021-09-21 14:23:45

timedatectl

               Local time: Tue 2021-09-21 14:23:45 UTC
           Universal time: Tue 2021-09-21 14:23:45 UTC
                 RTC time: Tue 2021-09-21 14:23:45
                Time zone: Etc/UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: yes

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

int main() {
    time_t rawtime;
    struct tm * timeinfo;

    time(&rawtime);
    timeinfo = localtime(&rawtime);

    printf("Current local time and date: %s", asctime(timeinfo));
    return 0;
}

import datetime

now = datetime.datetime.now()
print("Current local time and date:", now.strftime("%Y-%m-%d %H:%M:%S"))

import java.util.Date;

public class GetCurrentTime {
    public static void main(String[] args) {
        Date date = new Date();
        System.out.println("Current time: " + date.toString());
    }
}

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

int main() {
    struct timeval tv;
    gettimeofday(&tv, NULL);
    printf("Seconds: %ld\nMicroseconds: %ld\n", tv.tv_sec, tv.tv_usec);
    return 0;
}