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:
// 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));
}
} |
Output:
Date 1: 2018-11-03T12:45:30 Date 2: 2015-01-05T12:45:30 After comparison: -3
Program 2:
// 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));
}
} |
Output:
Date 1: 2010-12-05T12:50:30 Date 2: 2012-05-10T12:50:30 After comparison: 2