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Showing content from https://www.geeksforgeeks.org/java/zoneddatetime-format-method-in-java-with-examples/ below:

ZonedDateTime format() method in Java with Examples

Last Updated : 02 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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