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:

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// 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);
    }
}

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Output:

Result: 19:21:12.123+05:30

Program 2:

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// 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);
    }
}

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Output:

Result: 20181025+0200

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoZonedDateTime.html#format-java.time.format.DateTimeFormatter-



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