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  • Java8的日期时间处理

    代码:

    package com.ufo.java8datetime;
    
    import java.time.Clock;
    import java.time.LocalDate;
    import java.time.LocalTime;
    import java.time.Period;
    import java.time.format.DateTimeFormatter;
    import java.time.temporal.ChronoUnit;
    
    public class Java8DateTime {
        public static void main(String[] args) {
            // 取今天日期
            LocalDate today=LocalDate.now();
            System.out.println("Today's date="+today);
            System.out.println("Today's year="+today.getYear());
            System.out.println("Today's month="+today.getMonthValue());
            System.out.println("Today's day="+today.getDayOfMonth());
            
            // 特定日期
            LocalDate devoiceDay=LocalDate.of(2020, 1, 16);
            System.out.println("Devoice date="+devoiceDay);
            
            // 日期相等比较
            if(today.equals(devoiceDay)==false) {
                System.out.println("today !=devoiceDay ");
            }
            
            // 一周后
            LocalDate aWeekLater=today.plus(1, ChronoUnit.WEEKS);
            System.out.println("A week later="+aWeekLater);
            
            // 一年前
            LocalDate aYearBefore=today.plus(-1, ChronoUnit.YEARS);
            System.out.println("A Year before="+aYearBefore);
            
            // 日期比较
            LocalDate longAgo=LocalDate.of(2000, 1, 1);
            if(longAgo.isBefore(aYearBefore)) {
                System.out.println(longAgo+" is before "+aYearBefore);
            }
            
            // 日期比较
            if(today.isAfter(aYearBefore)) {
                System.out.println(today+" is after "+aYearBefore);
            }
            
            // 年份差
            Period years=Period.between(longAgo, aYearBefore);
            System.out.println("There are "+years.getYears()+" years between "+longAgo+" "+aYearBefore);
            
            // 当前时间
            LocalTime currTime=LocalTime.now();
            System.out.println("Current time="+currTime);
            
            // 时间加
            LocalTime threehoursLater=currTime.plusHours(3);
            System.out.println("3 hours later="+threehoursLater);
            
            // 取毫秒时间戳
            Clock clock=Clock.systemUTC();
            System.out.println(clock.millis()+" == "+System.currentTimeMillis());
            
            // 日期转字符串
            DateTimeFormatter format1=DateTimeFormatter.ofPattern("yyyy年MM月dd日");
            System.out.println(today.format(format1));
            
            // 字符串转日期
            LocalDate date1=LocalDate.parse("1644年03月14日", format1);
            System.out.println(date1);
        }
    }

    输出:

    Today's date=2020-01-20
    Today's year=2020
    Today's month=1
    Today's day=20
    Devoice date=2020-01-16
    today !=devoiceDay 
    A week later=2020-01-27
    A Year before=2019-01-20
    2000-01-01 is before 2019-01-20
    2020-01-20 is after 2019-01-20
    There are 19 years between 2000-01-01 2019-01-20
    Current time=20:40:57.528
    3 hours later=23:40:57.528
    1579524057528 == 1579524057528
    2020年01月20日
    1644-03-14

    2020年1月20日

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  • 原文地址:https://www.cnblogs.com/heyang78/p/12219376.html
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