ChronoZonedDateTime isBefore() method in Java with Examples

Last Updated : 29 May, 2019
The isBefore() method of ChronoZonedDateTime interface in Java is used to check if the date, passed as the parameter, is before this ChronoZonedDateTime instance or not. It returns a boolean value showing the same. Syntax: 
public boolean isBefore(ChronoZonedDateTime otherDate)
Parameter: This method accepts a parameter otherDate which specifies the other date-time to be compared to this ChronoZonedDateTime. 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 ChronoZonedDateTime.isBefore() method: Program 1: Java 
// 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
        ChronoZonedDateTime dt1
            = ZonedDateTime.parse(
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");

        // Prints the date
        System.out.println(dt1);

        // Parses the date
        ChronoZonedDateTime dt2
            = ZonedDateTime.parse(
                "2018-10-06T19:21:12.123+05:30[Asia/Calcutta]");

        // Prints the date
        System.out.println(dt2);

        // Compares both dates
        System.out.println(dt1.isBefore(dt2));
    }
}
Output: 
2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
2018-10-06T19:21:12.123+05:30[Asia/Calcutta]
false
Program 2: Java 
// 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
        ChronoZonedDateTime dt1
            = ZonedDateTime.parse(
                "2018-10-06T19:21:12.123+05:30[Asia/Calcutta]");

        // Prints the date
        System.out.println(dt1);

        // Parses the date
        ChronoZonedDateTime dt2
            = ZonedDateTime.parse(
                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");

        // Prints the date
        System.out.println(dt2);

        // Compares both dates
        System.out.println(dt1.isBefore(dt2));
    }
}
Output: 
2018-10-06T19:21:12.123+05:30[Asia/Calcutta]
2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
true
Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoZonedDateTime.html#isBefore-java.time.chrono.ChronoZonedDateTime-
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