The following classes are used in Java8 to calculate date and time differences: Period, Duration, ChronoUnit

1. Brief description

In Java8, we can use the following class to calculate the date and time difference:

1.Period
2.Duration
3.ChronoUnit

2.Period Class

主要是Period类方法getYears（），getMonths（）和getDays（）来计算.

Example:

package insping;

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());
    }
}

Result:

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

3. Duration class

provides the use of time-based values ​​(such as seconds, nanoseconds) A method of measuring the amount of time.
Example:

package insping;

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());

    }
}

Result:

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

IV. 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.

package insping;

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);

    }
}

Result:

开始时间  : 1993-10-19
结束时间 : 2017-06-16
两天之间的差在天数   : 8641

Related articles:

JS Calculate Date Time Difference

php Calculate Date Number of days difference (the time difference between any time and the current time)

Related videos:

Geek Academy Java8 new features video tutorial-free online video tutorial

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