Java类库系列--DateTimeFormatter

其他网址

Java 预定义日期时间格式_w3cschool

实例 

package org.example.a;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Demo{
    public static void main(String[] args) {
        LocalDateTime rightNow=LocalDateTime.now();
        //预定义的格式进行格式化
        String date= DateTimeFormatter.ISO_LOCAL_DATE_TIME.format(rightNow);
        System.out.println(date);

        //自定义格式进行格式化
        DateTimeFormatter formatter=DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
        System.out.println(formatter.format(rightNow));
    }
}

 执行结果

2020-07-29T23:03:03.014
2020-07-29 23:03:03

预定义格式

预定义格式化程序在DateTimeFormatter 类中定义为常量。

常量	示例
ISO_LOCAL_DATE	'2011-12-03'
ISO_OFFSET_DATE	'2011-12-03+01:00'
ISO_DATE	'2011-12-03' '2011-12-03+01:00'
ISO_LOCAL_TIME	'10:15' '10:15:30'
ISO_OFFSET_TIME	'10:15+01:00'  '10:15:30+01:00'
ISO_TIME	'10:15', '10:15:30' '10:15:30+01:00'
ISO_LOCAL_DATE_TIME	'2011-12-03T10:15'  //好像可以，待确定 '2011-12-03T10:15:30'
ISO_OFFSET_DATE_TIME	'2011-12-03T10:15:30+01:00'
ISO_ZONED_DATE_TIME	'2011-12-03T10:15:30+01:00[Europe/Paris]'
ISO_DATE_TIME	'2011-12-03T10:15:30', '2011-12-03T10:15:30+01:00' '2011-12-03T10:15:30+01:00[Europe/Paris]'
ISO_ORDINAL_DATE	'2012-337'
ISO_WEEK_DATE	'2012-W48-6'
ISO_INSTANT	'2011-12-03T10:15:30Z'
BASIC_ISO_DATE	'20111203'

 

本文地址：https://blog.csdn.net/feiying0canglang/article/details/107677942