Java：时间戳获取和日期时间格式化

package com.example.demo;

import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Calendar;
import java.util.Date;

public class TimeDemo { public static void main(String[] args) { // 旧API System.out.println(System.currentTimeMillis()); // 1594801771810 Date date = new Date(); System.out.println(date.getTime()); // 1594802296250 Calendar calendar = Calendar.getInstance(); System.out.println(calendar.getTimeInMillis()); // 1594802296258 // 新API Instant instant = Instant.now(); System.out.println(instant.getEpochSecond()); // 1594802296 System.out.println(instant.toEpochMilli()); // 1594802296321 LocalDateTime localDateTime = LocalDateTime.now(); System.out.println(localDateTime.toEpochSecond(ZoneOffset.of("+8"))); // 1594802868 ZonedDateTime zonedDateTime = ZonedDateTime.now(); System.out.println(zonedDateTime.toEpochSecond()); // 1594803196 // 格式化 替换 SimpleDateFormat DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"); System.out.println(formatter.format(localDateTime)); // 2020-07-15 16:44:26 System.out.println(LocalDateTime.parse("2020-07-15 16:43:47", formatter)); // 2020-07-15T16:43:47 }
}


  

 

  
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文章来源: pengshiyu.blog.csdn.net，作者：彭世瑜，版权归原作者所有，如需转载，请联系作者。

原文链接：pengshiyu.blog.csdn.net/article/details/107365201