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:
// 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:
// 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
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