Calculate how to calculate date and time difference in Java8

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1 Period class

Methods getYears(), getMonths() and getDays().

import java.time.LocalDate;import java.time.Month;import java.time.Period;public class Test {

    public static void main(String[] args) {
        LocalDate today = LocalDate.now();
        System.out.println("Today : " + today);
        LocalDate birthDate = LocalDate.of(1993, Month.OCTOBER, 19);
        System.out.println("BirthDate : " + birthDate);

        Period p = Period.between(birthDate, today);
        System.out.printf("年龄 : %d 年 %d 月 %d 日", p.getYears(), p.getMonths(), p.getDays());
    }}

Today : 2017-06-16BirthDate : 1993-10-19年龄 : 23 年 7 月 28 日

2 Duration class

A method to measure the amount of time based on a time value (such as seconds, nanoseconds).

import java.time.Duration;import java.time.Instant;public class Test {

    public static void main(String[] args) {
        Instant inst1 = Instant.now();
        System.out.println("Inst1 : " + inst1);
        Instant inst2 = inst1.plus(Duration.ofSeconds(10));
        System.out.println("Inst2 : " + inst2);

        System.out.println("Difference in milliseconds : " + Duration.between(inst1, inst2).toMillis());

        System.out.println("Difference in seconds : " + Duration.between(inst1, inst2).getSeconds());

    }}

Inst1 : 2017-06-16T07:46:45.085Z
Inst2 : 2017-06-16T07:46:55.085Z
Difference in milliseconds : 10000Difference in seconds : 10

3 ChronoUnit class

The ChronoUnit class can be used to measure a period of time in a single unit of time, such as days or seconds.
The following is an example of using the between() method to find the difference between two dates.

import java.time.LocalDate;import java.time.Month;import java.time.temporal.ChronoUnit;public class Test {

    public static void main(String[] args) {
        LocalDate startDate = LocalDate.of(1993, Month.OCTOBER, 19);
        System.out.println("开始时间  : " + startDate);

        LocalDate endDate = LocalDate.of(2017, Month.JUNE, 16);
        System.out.println("结束时间 : " + endDate);

        long daysDiff = ChronoUnit.DAYS.between(startDate, endDate);
        System.out.println("两天之间的差在天数   : " + daysDiff);

    }}

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