Java8常用时间方法(LocalDateTime)的示例分享

获取当前时间 
   对时间进行加减操作
   等等

import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.Period;
import java.time.format.DateTimeFormatter;

public class java8Time {
 public static void main(String[] args) {
	//现在时间
	System.out.println("----------------现在时间------------------");
	System.out.println(LocalDateTime.now());
	//格式化
	System.out.println("----------------格式化------------------");
	System.out.println(LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//减10s
	System.out.println("-----------------减10s-----------------");
	System.out.println(LocalDateTime.now().minusSeconds(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//加10s
	System.out.println("------------------加10s----------------");
	System.out.println(LocalDateTime.now().minusSeconds(-10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//减10个小时
	System.out.println("------------------减10个小时----------------");
	System.out.println(LocalDateTime.now().minusHours(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//减10分钟
	System.out.println("------------------减10分钟----------------");
	System.out.println(LocalDateTime.now().minusMinutes(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//减两周
	System.out.println("------------------减两周----------------");
	System.out.println(LocalDateTime.now().minusWeeks(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//减两年
	System.out.println("------------------减两年----------------");
	System.out.println(LocalDateTime.now().minusYears(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//构建一个时间
	System.out.println("------------------构建一个时间----------------");
	System.out.println(LocalDateTime.of(2021, 1, 1, 1, 1, 1, 1));

	//加10s
	System.out.println("-----------------加10s-----------------");
	System.out.println(LocalDateTime.now().plusSeconds(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//加10个小时
	System.out.println("------------------加10个小时----------------");
	System.out.println(LocalDateTime.now().plusHours(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//加10分钟
	System.out.println("------------------加10分钟----------------");
	System.out.println(LocalDateTime.now().plusMinutes(10).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//加两周
	System.out.println("------------------加两周----------------");
	System.out.println(LocalDateTime.now().plusWeeks(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//加两年
	System.out.println("------------------加两年----------------");
	System.out.println(LocalDateTime.now().plusYears(2).format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
	//修改小时
	System.out.println("------------------修改小时--------------------");
	System.out.println(LocalDateTime.now().withHour(20));

	//修改年份
	System.out.println("------------------修改年份--------------------");
	System.out.println(LocalDateTime.now().withYear(2018));
	//时间比较
	System.out.println("---------------------时间比较----Duration----------------");
	//毫秒
	System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toMillis());
	//分钟
	System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toMinutes());
	//小时
	System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toHours());
	//天
	System.out.println(Duration.between(LocalDateTime.now(), LocalDateTime.now().plusSeconds(360000)).toDays());


	System.out.println("-------------------------Period-------------------------");
	LocalDate localDate = LocalDate.of(2021, 1, 1);
	//毫秒
	System.out.println(Period.between(localDate, localDate.plusDays(2)).getDays());
	System.out.println(Period.between(localDate, localDate.plusDays(2)).getMonths());
	System.out.println(Period.between(localDate, localDate.plusDays(2)).getYears());

	System.out.println("---------------判断两个时间前后----------------------");
	LocalDateTime a = LocalDateTime.of(2012, 6, 30, 12, 00);
	LocalDateTime b = LocalDateTime.of(2012, 7, 1, 12, 00);
	boolean after = a.isAfter(b);
	boolean before = a.isBefore(b);
	System.out.println(after);
	System.out.println(before);

	}
}