LocalDateTime compareTo() method in Java with Examples

The compareTo() method of LocalDateTime class in Java is used to compare this date-time to the date-time passed as the parameter.

Syntax:

public int compareTo(ChronoLocalDateTime anotherDate)

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

Returns: The function returns an integer value which is the comparator value after comparison.

Below programs illustrate the LocalDateTime.compareTo() method:

Program 1:

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// Program to illustrate the compareTo() 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("2015-01-05T12:45:30");
  
        // Prints the date
        System.out.println("Date 2: " + dt2);
  
        // Compares the date
        System.out.println("After comparison: "
                           + dt2.compareTo(dt1));
    }
}

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Output:

Date 1: 2018-11-03T12:45:30
Date 2: 2015-01-05T12:45:30
After comparison: -3

Program 2:

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// Program to illustrate the compareTo() method
  
import java.util.*;
import java.time.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // Parses the date
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2010-12-05T12:50:30");
  
        // Prints the date
        System.out.println("Date 1: " + dt1);
  
        // Parses the date
        LocalDateTime dt2
            = LocalDateTime
                  .parse("2012-05-10T12:50:30");
  
        // Prints the date
        System.out.println("Date 2: " + dt2);
  
        // Compares the date
        System.out.println("After comparison: "
                           + dt2.compareTo(dt1));
    }
}

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Output:

Date 1: 2010-12-05T12:50:30
Date 2: 2012-05-10T12:50:30
After comparison: 2

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



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