LocalDateTime isBefore() method in Java with Examples

The isBefore() method of LocalDateTime class in Java checks if this date is before the specified date-time.

Syntax:

public boolean isBefore(ChronoLocalDateTime other)

Parameter: This method accepts a parameter other which is the other date-time to be compared to. It should not be null.

Returns: The function returns boolean value: if this date-time is before the specified date-time.

Below programs illustrate the LocalDateTime.isBefore() method:

Program 1:

Java

// Program to illustrate the isBefore() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // Parses the date
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-11-03T12:45:30");

        // Prints the date
        System.out.println("Date 1: " + dt1);

        // Parses the date
        LocalDateTime dt2
            = LocalDateTime
                  .parse("2016-12-04T12:45:30");

        // Prints the date
        System.out.println("Date 2: " + dt2);

        // Compares both dates
        System.out.println("Is Date 1 before Date 2: "
                           + dt1.isBefore(dt2));
    }
}

Output:

Date 1: 2018-11-03T12:45:30
Date 2: 2016-12-04T12:45:30
Is Date 1 before Date 2: false

Program 2:

Java

// Program to illustrate the isBefore() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        // Parses the date
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-11-03T12:45:30");

        // Prints the date
        System.out.println("Date 1: " + dt1);

        // Parses the date
        LocalDateTime dt2
            = LocalDateTime
                  .parse("2019-12-04T12:45:30");

        // Prints the date
        System.out.println("Date 2: " + dt2);

        // Compares both dates
        System.out.println("Is Date 1 before Date 2: "
                           + dt1.isBefore(dt2));
    }
}

Output:

Date 1: 2018-11-03T12:45:30
Date 2: 2019-12-04T12:45:30
Is Date 1 before Date 2: true

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#isBefore(java.time.chrono.ChronoLocalDateTime)