ChronoZonedDateTime format() method in Java with Examples

The format() method of ChronoZonedDateTime interface in Java is used to format this date-time using the specified formatter passed as parameter.This date-time will be passed to the formatter to produce a string.

Syntax:

default String format(DateTimeFormatter formatter)

Parameters: This method accepts a single parameter formatter which represents the formatter to use. This is a mandatory parameter and should not be NULL.

Return value: This method returns a String represents the formatted date-time string.

Exception: This method throws a DateTimeException if an error occurs during printing.

Below programs illustrate the format() method:
Program 1:

// Java program to demonstrate 
// ChronoZonedDateTime.format() method 

import java.time.*; 

import java.time.chrono.*; 

import java.time.format.*; 

public class GFG { 

    public static void main(String[] args) 

    { 

        // create ChronoZonedDateTime objects 

        ChronoZonedDateTime zoneddatetime 

            = ZonedDateTime.parse( 

                "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]"); 

        // create a formatter 

        DateTimeFormatter formatter 

            = DateTimeFormatter.ISO_TIME; 

        // apply format() 

        String value 

            = zoneddatetime.format(formatter); 

        // print result 

        System.out.println("Result: " + value); 

    } 
}

Output:

Result: 19:21:12.123+05:30

Program 2:

// Java program to demonstrate 
// ChronoZonedDateTime.format() method 

import java.time.*; 

import java.time.chrono.*; 

import java.time.format.*; 

public class GFG { 

    public static void main(String[] args) 

    { 

        // create ChronoZonedDateTime objects 

        ChronoZonedDateTime zoneddatetime 

            = ZonedDateTime.parse( 

                "2018-10-25T23:12:31.123+02:00[Europe/Paris]"); 

        // create a formatter 

        DateTimeFormatter formatter 

            = DateTimeFormatter.BASIC_ISO_DATE; 

        // apply format() 

        String value 

            = zoneddatetime.format(formatter); 

        // print result 

        System.out.println("Result: " + value); 

    } 
}