Java 8 – How to check whether a LocalDate is Before another LocalDate ?

August 4, 2022 SJ Java 8, Java 8 Date/Time 0

In this article, we will learn how to check whether one LocalDate is Before another LocalDate using LocalDate.isBefore() method in Java 1.8 version

Compare 2 LocalDate using isBefore() method :

  • If there are 2 LocalDate and the requirement is to check whether one LocalDate is before another LocalDate, then isBefore() method can be used
    • isBefore(ChronoLocalDate) – checks if the invoking LocalDate is before the specified LocalDate
  • Lets see an example for comparing 2 LocalDate using isBefore() method
  • Note: Self comparing LocalDate using isBefore() method always returns false, as shown in the below illustration

CheckLocalDateIsBeforeAnotherLocalDate.java

package in.bench.resources.java8.localdate.examples;

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

public class CheckLocalDateIsBeforeAnotherLocalDate {

	public static void main(String[] args) {

		// 1. get today's LocalDate
		LocalDate todaysLocalDate = LocalDate.of(2022, Month.AUGUST, 3);
		System.out.println("1. Today's LocalDate is = " + todaysLocalDate);


		// 2. form past LocalDate
		LocalDate pastLocalDate = LocalDate.of(2022, Month.AUGUST, 1);
		System.out.println("2. Past LocalDate is = " + pastLocalDate);


		// 3. form future LocalDate
		LocalDate futureLocalDate = LocalDate.of(2022, Month.AUGUST, 29);
		System.out.println("3. Future LocalDate is = " + futureLocalDate);


		// 4. isBefore() - LocalDate comparison
		System.out.println("\n\n4. Comparing 2 LocalDate using isBefore() method :- \n");


		// 4.1 check whether todaysLocalDate isBefore futureLocalDate
		boolean isBefore1 = todaysLocalDate.isBefore(futureLocalDate);
		System.out.println("4.1 Today's LocalDate (" + todaysLocalDate 
				+ ") is Before Future LocalDate (" + futureLocalDate + ") ? "
				+ isBefore1);


		// 4.2 check whether todaysLocalDate isBefore pastLocalDate
		boolean isBefore2 = todaysLocalDate.isBefore(pastLocalDate);
		System.out.println("4.2 Today's LocalDate (" + todaysLocalDate 
				+ ") is Before Past LocalDate (" + pastLocalDate + ") ? "
				+ isBefore2);


		// 4.3 check whether pastLocalDate isBefore todaysLocalDate 
		boolean isBefore3 = pastLocalDate.isBefore(todaysLocalDate);
		System.out.println("4.3 Past LocalDate (" + pastLocalDate 
				+ ") is Before Today's LocalDate (" + todaysLocalDate + ") ? "
				+ isBefore3);


		// 4.4 check whether pastLocalDate isBefore futureLocalDate 
		boolean isBefore4 = pastLocalDate.isBefore(futureLocalDate);
		System.out.println("4.4 Past LocalDate (" + pastLocalDate 
				+ ") is Before Future LocalDate (" + futureLocalDate + ") ? "
				+ isBefore4);


		// 4.5 check whether futureLocalDate isBefore todaysLocalDate 
		boolean isBefore5 = futureLocalDate.isBefore(todaysLocalDate);
		System.out.println("4.5 Future LocalDate (" + futureLocalDate 
				+ ") is Before Today's LocalDate (" + todaysLocalDate + ") ? "
				+ isBefore5);


		// 4.6 check whether futureLocalDate isBefore pastLocalDate 
		boolean isBefore6 = futureLocalDate.isBefore(todaysLocalDate);
		System.out.println("4.6 Future LocalDate (" + futureLocalDate 
				+ ") is Before Past LocalDate (" + pastLocalDate + ") ? "
				+ isBefore6);



		// 5. isBefore() - self LocalDate comparison
		System.out.println("\n\n5. Self comparing LocalDate using isBefore() method :- \n");


		// 5.1 check whether todaysLocalDate isBefore todaysLocalDate
		boolean isBefore7 = todaysLocalDate.isBefore(todaysLocalDate);
		System.out.println("5.1 Today's LocalDate (" + todaysLocalDate 
				+ ") is Before Today's LocalDate (" + todaysLocalDate + ") ? "
				+ isBefore7);


		// 5.2 check whether pastLocalDate isBefore pastLocalDate
		boolean isBefore8 = pastLocalDate.isBefore(pastLocalDate);
		System.out.println("5.2 Past LocalDate (" + pastLocalDate 
				+ ") is Before Past LocalDate (" + pastLocalDate + ") ? "
				+ isBefore8);


		// 5.3 check whether futureLocalDate isBefore futureLocalDate
		boolean isBefore9 = futureLocalDate.isBefore(futureLocalDate);
		System.out.print("5.3 Future LocalDate (" + futureLocalDate 
				+ ") is Before Future LocalDate (" + futureLocalDate + ") ? "
				+ isBefore9);
	}
}

Output:

1. Today's LocalDate is = 2022-08-03
2. Past LocalDate is = 2022-08-01
3. Future LocalDate is = 2022-08-29


4. Comparing 2 LocalDate using isBefore() method :- 

4.1 Today's LocalDate (2022-08-03) is Before Future LocalDate (2022-08-29) ? true
4.2 Today's LocalDate (2022-08-03) is Before Past LocalDate (2022-08-01) ? false
4.3 Past LocalDate (2022-08-01) is Before Today's LocalDate (2022-08-03) ? true
4.4 Past LocalDate (2022-08-01) is Before Future LocalDate (2022-08-29) ? true
4.5 Future LocalDate (2022-08-29) is Before Today's LocalDate (2022-08-03) ? false
4.6 Future LocalDate (2022-08-29) is Before Past LocalDate (2022-08-01) ? false


5. Self comparing LocalDate using isBefore() method :- 

5.1 Today's LocalDate (2022-08-03) is Before Today's LocalDate (2022-08-03) ? false
5.2 Past LocalDate (2022-08-01) is Before Past LocalDate (2022-08-01) ? false
5.3 Future LocalDate (2022-08-29) is Before Future LocalDate (2022-08-29) ? false

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References:

Happy Coding !!
Happy Learning !!

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