ChronoZonedDateTime compareTo() method in Java with Examples

The compareTo() method of ChronoZonedDateTime interface in Java method compares this date to another date.

Syntax:

default int compareTo(ChronoZonedDateTime other)

Parameter: This method accepts a parameter other which specifies the other date to compare to and it is not specifically null.



Return Value: It returns the comparator value which is negative if it is less else it is positive if it is greater.

Below programs illustrate the compareTo() method of ChronoZonedDateTime in Java:

Program 1:

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// Program to illustrate the compareTo() method
  
import java.util.*;
import java.time.*;
import java.time.chrono.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // First date
        ChronoZonedDateTime dt
            = ZonedDateTime.parse(
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");
  
        System.out.println(dt);
  
        // Second date
        ChronoZonedDateTime dt1
            = ZonedDateTime.parse(
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");
  
        System.out.println(dt1);
  
        try {
            // Compare both dates
            System.out.println(dt1.compareTo(dt));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
0

Program 2:

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// Program to illustrate the compareTo() method
  
import java.util.*;
import java.time.*;
import java.time.chrono.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // First date
        ChronoZonedDateTime dt
            = ZonedDateTime.parse(
                "2018-10-25T23:12:31.123+02:00[Europe/Paris]");
  
        System.out.println(dt);
  
        // Second date
        ChronoZonedDateTime dt1
            = ZonedDateTime.parse(
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");
  
        System.out.println(dt1);
  
        try {
            // Compare both dates
            System.out.println(dt1.compareTo(dt));
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

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Output:

2018-10-25T23:12:31.123+02:00[Europe/Paris]
2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
1

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoZonedDateTime.html#compareTo-java.time.chrono.ChronoZonedDateTime-



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