ZonedDateTime format() method in Java with Examples

Last Updated : 2 May, 2019
The format() method of ZonedDateTime class 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: 
public 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 
// Java program to demonstrate
// ZonedDateTime.format() method

import java.time.*;
import java.time.format.*;

public class GFG {
    public static void main(String[] args)
    {

        // create ZonedDateTime objects
        ZonedDateTime 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 
// Java program to demonstrate
// ZonedDateTime.format() method

import java.time.*;
import java.time.format.*;

public class GFG {
    public static void main(String[] args)
    {

        // create ZonedDateTime objects
        ZonedDateTime 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);
    }
}
Output: 
Result: 20181025+0200
Reference: https://docs.oracle.com/javase/10/docs/api/java/time/ZonedDateTime.html#format(java.time.format.DateTimeFormatter)
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