java8时间处理实例

实例：

package com.javaBase.time;

import java.time.Clock;
import java.time.LocalDate;
import java.time.LocalTime;
import java.time.MonthDay;
import java.time.YearMonth;
import java.time.temporal.ChronoUnit;

public class GetDateWithJava8 {
	public static void main(String[] args) {
		//2019-04-11
		LocalDate today=LocalDate.now();
		//2019
		int year=today.getYear();
		//4
		int month=today.getMonthValue();
		//11
		int day=today.getDayOfMonth();
		//101,表示本年过了多天
		int dayOfYear=today.getDayOfYear();
		System.out.println("today:"+today+",year:"+year+",month:"+month+",day:"+day+",dayOfYear:"+dayOfYear);
		//创建指定日期
		//2019-04-11
		LocalDate myDate=LocalDate.of(2019,4,11);
		//日期比较,同一天则是true
		boolean flag=today.equals(myDate);
		//检查生日
		LocalDate dateOfBirth=LocalDate.of(1995,3,12);
		MonthDay birthDay=MonthDay.of(dateOfBirth.getMonth(), dateOfBirth.getDayOfMonth());
		LocalDate now=LocalDate.now();
		MonthDay currentMonthDay=MonthDay.from(now);
		if(currentMonthDay.equals(birthDay)) {
			System.out.println("今天是生日...");
		}
		//获取当前时间,默认的格式是hh:mm:ss:nnn
		//15:53:11.096
		LocalTime nowTime=LocalTime.now();
		//增加2个小时
		//17:53:11.096
		LocalTime twoHour=nowTime.plusHours(2);
		//增加一周
		//2019-04-18
		LocalDate oneWeek=today.plus(1,ChronoUnit.WEEKS);
		//增加一个月
		//2019-05-11
		LocalDate oneMonth=today.plusMonths(1);
		//增加一年
		//2020-04-11
		LocalDate oneYear=today.plus(1, ChronoUnit.YEARS);
		//使用时钟
		//SystemClock[Z]
		Clock clock=Clock.systemUTC();
		//SystemClock[Asia/Shanghai]
		clock=Clock.systemDefaultZone();
		//*****************日期比较**********************//
		LocalDate tomorrow=today.plus(1,ChronoUnit.DAYS);
		//返回true
		today.isBefore(tomorrow);
		//返回true
		tomorrow.isAfter(today);
		//*******检查本月的天数*****//
		//2019-04
		YearMonth currentYearMonth=YearMonth.now();
		//获取本月的天数
		//30
		currentYearMonth.lengthOfMonth();
		//检查平年还是闰年
		//false（表示不是闰年）
		today.isLeapYear();
		System.out.println(today.isLeapYear());
		// 两个日期之间包含多少天，

	}

}

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