java---LocalDateTime

package javasm.demo02;

import java.time.*;
import java.time.temporal.ChronoUnit;

public class LocalDaTime {
    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        System.out.println(now.toString());
        LocalDateTime localDateTime = LocalDateTime.of(2022,8,10,15,30);
        System.out.println(localDateTime.toString());
        //加10天日期，前面10数量，后面DAYS。 ChronoUnit.DAYS单位
        //plus加 minus减
        now=now.plus(10, ChronoUnit.DAYS);
        System.out.println("now前:"+now.toString());
        //自身减日期  now
        System.out.println("now后"+now.minus(Duration.of(5, ChronoUnit.DAYS)));
        //求两个时间间隔（单位自选）    时间1：now  时间2：localDateTime，间隔单位ChronoUnit.所需单位
        long localDateTimeUntil = Math.abs(now.until(localDateTime, ChronoUnit.DAYS));
        System.out.println("localDateTimeUntil:  "+localDateTimeUntil);
        //LocalDateTime和LocalDate用法基本一样，但两个时间相减不能自选单位如年月日
        //LocalDate没有时分秒
        LocalDate localDa1 = LocalDate.now();
        LocalDate localDa2 = LocalDate.of(2022,9,22);
        Period LocalDateUntil = localDa2.until(localDa1);
        System.out.println("LocalDateUntil  "+LocalDateUntil);
        //获得间隔的日期：可选年月日getDays()
        System.out.println(LocalDateUntil.getDays());
    }
}