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ChronoLocalDateTime isBefore() method in Java with Examples
  • Last Updated : 29 May, 2019

The isBefore() method of ChronoLocalDateTime interface in Java is used to check if the date, passed as the parameter, is before this ChronoLocalDateTime instance or not. It returns a boolean value showing the same.

Syntax:

default boolean isBefore(ChronoLocalDateTime otherDate)

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

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

Below programs illustrate the ChronoLocalDateTime.isBefore() method:



Program 1:

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// Program to illustrate the isBefore() method
  
import java.util.*;
import java.time.*;
import java.time.chrono.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // Parses the date
        ChronoLocalDateTime dt1
            = LocalDateTime.parse("2018-11-03T12:45:30");
  
        // Prints the date
        System.out.println(dt1);
  
        // Parses the date
        ChronoLocalDateTime dt2
            = LocalDateTime.parse("2016-12-04T12:45:30");
  
        // Prints the date
        System.out.println(dt2);
  
        // Compares both dates
        System.out.println(dt1.isBefore(dt2));
    }
}

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Output:

2018-11-03T12:45:30
2016-12-04T12:45:30
false

Program 2:

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// Program to illustrate the isBefore() method
  
import java.util.*;
import java.time.*;
import java.time.chrono.*;
  
public class GfG {
    public static void main(String[] args)
    {
        // Parses the date
        ChronoLocalDateTime dt1
            = LocalDateTime.parse("2018-11-03T12:45:30");
  
        // Prints the date
        System.out.println(dt1);
  
        // Parses the date
        ChronoLocalDateTime dt2
            = LocalDateTime.parse("2019-12-04T12:45:30");
  
        // Prints the date
        System.out.println(dt2);
  
        // Compares both dates
        System.out.println(dt1.isBefore(dt2));
    }
}

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Output:

2018-11-03T12:45:30
2019-12-04T12:45:30
true

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

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