[开发工具]Java时间转换

Java时间转换demo

package com.ljquan.test.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * @className DatetimeFormat
 * @Description:
 * @Author ljquan
 * @Date 2022/05/01 16:22:08
 * @Version 1.0.0
 */
public class DatetimeFormat {
    public static void main(String[] args) {
        //当前时间
        Date date = new Date();
        //当前时间戳转化为date
        long currentTimeMillis = System.currentTimeMillis();
        Date date1 = new Date(currentTimeMillis);


        System.out.println(date);
        //获取当前时间戳
        System.out.println(date.getTime());
        //获取当前时间的年月日
        String formatDateTime = "yyyy-MM-dd HH:mm:ss";
        String formatDateTime1 = "yyyy-MM-dd";
        String formatDateTime2 = "HH:mm:ss";
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat(formatDateTime);
        System.out.println(simpleDateFormat.format(date));
        System.out.println("===========");
        System.out.println(simpleDateFormat.format(date1));
        
    }
}

输出：

Sun May 01 16:40:24 CST 2022
1651394424743
2022-05-01 16:40:24
===========
2022-05-01 16:40:24

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