Java 8 – How to check whether a LocalDateTime is After another LocalDateTime ?

August 11, 2022 SJ Java 8, Java 8 Date/Time 0

In this article, we will learn how to check whether one LocalDateTime is After another LocalDateTime using LocalDateTime.isAfter() method in Java 1.8 version

Compare 2 LocalDateTime using isAfter() method :

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

CheckLocalDateTimeIsAfterAnotherLocalDateTime.java

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

import java.time.LocalDateTime;
import java.time.Month;

public class CheckLocalDateTimeIsAfterAnotherLocalDateTime {

	public static void main(String[] args) {

		// 1. get Current Date/time
		LocalDateTime todaysLocalDateTime = LocalDateTime.of(2022, Month.AUGUST, 11, 12, 30, 30, 500);
		System.out.println("1. Current Date/time is = " + todaysLocalDateTime);


		// 2. form Past Date/time
		LocalDateTime pastLocalDateTime = LocalDateTime.of(2022, Month.AUGUST, 11, 1, 1, 1, 100);
		System.out.println("2. Past Date/time is = " + pastLocalDateTime);


		// 3. form Future Date/time
		LocalDateTime futureLocalDateTime = LocalDateTime.of(2022, Month.AUGUST, 11, 23, 59, 59, 200);
		System.out.println("3. Future Date/time is = " + futureLocalDateTime);



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


		// 4.1 check whether todaysLocalDateTime isAfter futureLocalDateTime
		boolean isAfter1 = todaysLocalDateTime.isAfter(futureLocalDateTime);
		System.out.println("4.1 Current Date/time (" + todaysLocalDateTime 
				+ ") \n\t\t is After Future Date/time (" + futureLocalDateTime + ") ? "
				+ isAfter1);


		// 4.2 check whether todaysLocalDateTime isAfter pastLocalDateTime
		boolean isAfter2 = todaysLocalDateTime.isAfter(pastLocalDateTime);
		System.out.println("4.2 Current Date/time (" + todaysLocalDateTime 
				+ ") \n\t\t is After Past Date/time (" + pastLocalDateTime + ") ? "
				+ isAfter2);


		// 4.3 check whether pastLocalDateTime isAfter todaysLocalDateTime 
		boolean isAfter3 = pastLocalDateTime.isAfter(todaysLocalDateTime);
		System.out.println("4.3 Past Date/time (" + pastLocalDateTime 
				+ ") \n\t\t is After Current Date/time (" + todaysLocalDateTime + ") ? "
				+ isAfter3);


		// 4.4 check whether pastLocalDateTime isAfter futureLocalDateTime 
		boolean isAfter4 = pastLocalDateTime.isAfter(futureLocalDateTime);
		System.out.println("4.4 Past Date/time (" + pastLocalDateTime 
				+ ") \n\t\t is After Future Date/time (" + futureLocalDateTime + ") ? "
				+ isAfter4);


		// 4.5 check whether futureLocalDateTime isAfter todaysLocalDateTime 
		boolean isAfter5 = futureLocalDateTime.isAfter(todaysLocalDateTime);
		System.out.println("4.5 Future Date/time (" + futureLocalDateTime 
				+ ") \n\t\t is After Current Date/time (" + todaysLocalDateTime + ") ? "
				+ isAfter5);


		// 4.6 check whether futureLocalDateTime isAfter pastLocalDateTime 
		boolean isAfter6 = futureLocalDateTime.isAfter(todaysLocalDateTime);
		System.out.println("4.6 Future Date/time (" + futureLocalDateTime 
				+ ") \n\t\t is After Past Date/time (" + pastLocalDateTime + ") ? "
				+ isAfter6);



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


		// 5.1 check whether todaysLocalDateTime isAfter todaysLocalDateTime
		boolean isAfter7 = todaysLocalDateTime.isAfter(todaysLocalDateTime);
		System.out.println("5.1 Current Date/time (" + todaysLocalDateTime 
				+ ") \n\t\t is After Current Date/time (" + todaysLocalDateTime + ") ? "
				+ isAfter7);


		// 5.2 check whether pastLocalDateTime isAfter pastLocalDateTime
		boolean isAfter8 = pastLocalDateTime.isAfter(pastLocalDateTime);
		System.out.println("5.2 Past Date/time (" + pastLocalDateTime 
				+ ") \n\t\t is After Past Date/time (" + pastLocalDateTime + ") ? "
				+ isAfter8);


		// 5.3 check whether futureLocalDateTime isAfter futureLocalDateTime
		boolean isAfter9 = futureLocalDateTime.isAfter(futureLocalDateTime);
		System.out.print("5.3 Future Date/time (" + futureLocalDateTime 
				+ ") \n\t\t is After Future Date/time (" + futureLocalDateTime + ") ? "
				+ isAfter9);
	}
}

Output:

1. Current Date/time is = 2022-08-11T12:30:30.000000500
2. Past Date/time is = 2022-08-11T01:01:01.000000100
3. Future Date/time is = 2022-08-11T23:59:59.000000200


4. Comparing 2 LocalDateTime using isAfter() method :- 

4.1 Current Date/time (2022-08-11T12:30:30.000000500) 
		 is After Future Date/time (2022-08-11T23:59:59.000000200) ? false
4.2 Current Date/time (2022-08-11T12:30:30.000000500) 
		 is After Past Date/time (2022-08-11T01:01:01.000000100) ? true
4.3 Past Date/time (2022-08-11T01:01:01.000000100) 
		 is After Current Date/time (2022-08-11T12:30:30.000000500) ? false
4.4 Past Date/time (2022-08-11T01:01:01.000000100) 
		 is After Future Date/time (2022-08-11T23:59:59.000000200) ? false
4.5 Future Date/time (2022-08-11T23:59:59.000000200) 
		 is After Current Date/time (2022-08-11T12:30:30.000000500) ? true
4.6 Future Date/time (2022-08-11T23:59:59.000000200) 
		 is After Past Date/time (2022-08-11T01:01:01.000000100) ? true


5. Self comparing LocalDateTime using isAfter() method :- 

5.1 Current Date/time (2022-08-11T12:30:30.000000500) 
		 is After Current Date/time (2022-08-11T12:30:30.000000500) ? false
5.2 Past Date/time (2022-08-11T01:01:01.000000100) 
		 is After Past Date/time (2022-08-11T01:01:01.000000100) ? false
5.3 Future Date/time (2022-08-11T23:59:59.000000200) 
		 is After Future Date/time (2022-08-11T23:59:59.000000200) ? false

Related Articles:

References:

Happy Coding !!
Happy Learning !!

Java 8 – How to compare two LocalDateTime instances ?
Java 8 – How to check whether a LocalDateTime is Before another LocalDateTime ?

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