Java 8 ??? Period and Duration examples

Posted 2021-01-29

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Few examples to show you how to use Java 8 Duration, Period and ChronoUnit objects to find out the difference between dates.

1. Duration ??? Measures time in seconds and nanoseconds.
2. Period ??? Measures time in years, months and days.

1. Duration Example

A java.time.Duration example to find out difference seconds between two LocalDateTime

DurationExample.java

package com.mkyong.time;

import java.time.Duration;
import java.time.LocalDateTime;
import java.time.Month;
import java.time.temporal.ChronoUnit;

public class DurationExample {

    public static void main(String[] args) {

		// Creating Durations
        System.out.println("--- Examples --- ");

        Duration oneHours = Duration.ofHours(1);
        System.out.println(oneHours.getSeconds() + " seconds");

        Duration oneHours2 = Duration.of(1, ChronoUnit.HOURS);
        System.out.println(oneHours2.getSeconds() + " seconds");

		// Test Duration.between
        System.out.println("
--- Duration.between --- ");

        LocalDateTime oldDate = LocalDateTime.of(2016, Month.AUGUST, 31, 10, 20, 55);
        LocalDateTime newDate = LocalDateTime.of(2016, Month.NOVEMBER, 9, 10, 21, 56);

        System.out.println(oldDate);
        System.out.println(newDate);

        //count seconds between dates
        Duration duration = Duration.between(oldDate, newDate);

        System.out.println(duration.getSeconds() + " seconds");

    }
}

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Output

--- Examples --- 
3600 seconds
3600 seconds

--- Duration.between --- 
2016-08-31T10:20:55
2016-11-09T10:21:56
6048061 seconds

2. Period Example

A java.time.Period example to find out differently (years, months, days) between two LocalDates

PeriodExample.java

package com.mkyong.time;

import java.time.LocalDate;
import java.time.Month;
import java.time.Period;

public class PeriodExample {

    public static void main(String[] args) {

        System.out.println("--- Examples --- ");

        Period tenDays = Period.ofDays(10); 
        System.out.println(tenDays.getDays()); //10

        Period oneYearTwoMonthsThreeDays = Period.of(1, 2, 3);
        System.out.println(oneYearTwoMonthsThreeDays.getYears());   //1
        System.out.println(oneYearTwoMonthsThreeDays.getMonths());  //2
        System.out.println(oneYearTwoMonthsThreeDays.getDays());    //3

        System.out.println("
--- Period.between --- ");
        LocalDate oldDate = LocalDate.of(1982, Month.AUGUST, 31);
        LocalDate newDate = LocalDate.of(2016, Month.NOVEMBER, 9);

        System.out.println(oldDate);
        System.out.println(newDate);

        // check period between dates
        Period period = Period.between(oldDate, newDate);

        System.out.print(period.getYears() + " years,");
        System.out.print(period.getMonths() + " months,");
        System.out.print(period.getDays() + " days");

    }
}

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Output

--- Examples --- 
10
1
2
3

--- Period.between --- 
1982-08-31
2016-11-09
34 years,2 months,9 days

3. ChronoUnit Example

Alternatively, you can use ChronoUnit.{unit}.between to find out the difference between dates, review the following example :

ChronoUnitExample.java

package com.mkyong.time;

import java.time.LocalDateTime;
import java.time.Month;
import java.time.temporal.ChronoUnit;

public class ChronoUnitExample {

    public static void main(String[] args) {

        LocalDateTime oldDate = LocalDateTime.of(1982, Month.AUGUST, 31, 10, 20, 55);
        LocalDateTime newDate = LocalDateTime.of(2016, Month.NOVEMBER, 9, 10, 21, 56);

        System.out.println(oldDate);
        System.out.println(newDate);

        // count between dates
        long years = ChronoUnit.YEARS.between(oldDate, newDate);
        long months = ChronoUnit.MONTHS.between(oldDate, newDate);
        long weeks = ChronoUnit.WEEKS.between(oldDate, newDate);
        long days = ChronoUnit.DAYS.between(oldDate, newDate);
        long hours = ChronoUnit.HOURS.between(oldDate, newDate);
        long minutes = ChronoUnit.MINUTES.between(oldDate, newDate);
        long seconds = ChronoUnit.SECONDS.between(oldDate, newDate);
        long milis = ChronoUnit.MILLIS.between(oldDate, newDate);
        long nano = ChronoUnit.NANOS.between(oldDate, newDate);

        System.out.println("
--- Total --- ");
        System.out.println(years + " years");
        System.out.println(months + " months");
        System.out.println(weeks + " weeks");
        System.out.println(days + " days");
        System.out.println(hours + " hours");
        System.out.println(minutes + " minutes");
        System.out.println(seconds + " seconds");
        System.out.println(milis + " milis");
        System.out.println(nano + " nano");

    }
}

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Output

1982-08-31T10:20:55
2016-11-09T10:21:56

--- Total --- 
34 years
410 months
1784 weeks
12489 days
299736 hours
17984161 minutes
1079049661 seconds
1079049661000 milis
1079049661000000000 nano




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