Java 8 – TemporalAdjusters examples

1. TemporalAdjusters

Example to move a date to firstDayOfMonth, firstDayOfNextMonth, next Monday and etc.

TestDate.java

package com.mkyong.time;

import java.time.DayOfWeek; import java.time.LocalDate; import java.time.temporal.TemporalAdjusters; public class TestDate { public static void main(String[] args) { LocalDate localDate = LocalDate.now(); System.out.println("current date : " + localDate); LocalDate with = localDate.with(TemporalAdjusters.firstDayOfMonth()); System.out.println("firstDayOfMonth : " + with); LocalDate with1 = localDate.with(TemporalAdjusters.lastDayOfMonth()); System.out.println("lastDayOfMonth : " + with1); LocalDate with2 = localDate.with(TemporalAdjusters.next(DayOfWeek.MONDAY)); System.out.println("next monday : " + with2); LocalDate with3 = localDate.with(TemporalAdjusters.firstDayOfNextMonth()); System.out.println("firstDayOfNextMonth : " + with3); } } 

Copy

Output

current date : 2016-11-15
firstDayOfMonth : 2016-11-01
lastDayOfMonth : 2016-11-30
next monday : 2016-11-21 firstDayOfNextMonth : 2016-12-01 

Copy

Note
Please check this  official TemporalAdjusters JavaDoc for the entire list of the predefined TemporalAdjusters.

 

2. Custom TemporalAdjuster

Example to implement TemporalAdjuster to move a date to next Christmas.

NextChristmas.java

package com.mkyong.time;

import java.time.temporal.ChronoField; import java.time.temporal.Temporal; import java.time.temporal.TemporalAdjuster; public class NextChristmas implements TemporalAdjuster { @Override public Temporal adjustInto(Temporal temporal) { return temporal.with(ChronoField.MONTH_OF_YEAR, 12).with(ChronoField.DAY_OF_MONTH, 25); } } 

Copy

TestDate.java

package com.mkyong.time;

import java.time.LocalDate; public class TestDate { public static void main(String[] args) { LocalDate localDate = LocalDate.now(); System.out.println("current date : " + localDate); localDate = localDate.with(new NextChristmas()); System.out.println("Next Christmas : " + localDate); } } 

Copy

Output

current date : 2016-11-15
Next Christmas : 2016-12-25

Copy

Alternatively, you can use the following lambda expression :

	localDate = localDate.with(
		temporal -> temporal.with(ChronoField.MONTH_OF_YEAR, 12).with(ChronoField.DAY_OF_MONTH, 25) );

http://www.mkyong.com/java8/java-8-temporaladjusters-examples/