The compareTo() method of ChronoLocalDateTime interface in Java method compares this date to another date.
Syntax:
default int compareTo(ChronoLocalDateTime 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 ChronoLocalDateTime in Java:
Program 1:
// 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        ChronoLocalDateTime dt            = LocalDateTime.parse("2018-12-06T19:21:12");          System.out.println(dt);          // Second date        ChronoLocalDateTime dt1            = LocalDateTime.parse("2018-12-06T19:21:12");          System.out.println(dt1);          try {            // Compare both dates            System.out.println(dt1.compareTo(dt));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
2018-12-06T19:21:12 2018-12-06T19:21:12 0
Program 2:
// 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        ChronoLocalDateTime dt            = LocalDateTime.parse("2018-12-05T19:21:12");        System.out.println(dt);          // Second date        ChronoLocalDateTime dt1            = LocalDateTime.parse("2018-12-06T19:21:12");        System.out.println(dt1);          try {            // Compare both dates            System.out.println(dt1.compareTo(dt));        }        catch (Exception e) {            System.out.println(e);        }    }} |
Output:
2018-12-05T19:21:12 2018-12-06T19:21:12 1
