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Java 8 Clock fixed() method with Examples

Last Updated : 19 Jun, 2019

Java Clock class is part of Date Time API, java.time.Clock, of Java. The Java Date Time API was added from Java version 8. fixed() method of Clock class returns a clock object and the Clock object returns the same instant. Clock object is returned by calling

simply returns the same instant as specified using parameters. The returned class object is

. The main use of this method is in

, where the clock needed is fixed in place of the current clock.

public static Clock fixed(Instant fixedInstant, ZoneId zone)

This method takes two mandatory parameter:

• fixedInstant - the instant object to create Clock object. It must not be null.
• zone - the time zone for clock object. It must not be null.

This method returns Clock object that returns the same instant.

Input:: 
Instance object as parameter : Instant.parse("2018-08-19T16:45:42.00Z");
TimeZone Object as parameter : ZoneId.of("Asia/Calcutta");

Output::
class object: 

Explanation:: 
when Clock.fixed(Instant.parse("2018-08-19T16:45:42.00Z") is called, 
then the fixed() method will return a clock object
in return with fixed time zone and instance.

Below programs illustrates fixed() method of java.time.Clock class:

Using fixed() when Zone is defined

// Java program to demonstrate
// fixed() method of Clock class

import java.time.*;

// create class
public class fixedMethodDemo {

    // Main method
    public static void main(String[] args)
    {

        // create instance of clock class
        Instant instant = Instant.parse("2018-08-19T16:02:42.00Z");

        // create ZoneId object for Asia/Calcutta zone
        ZoneId zoneId = ZoneId.of("Asia/Calcutta");

        // call fixed method
        Clock clock = Clock.fixed(instant, zoneId);

        // print details of clock
        System.out.println(clock.toString());
    }
}

FixedClock[2018-08-19T16:02:42Z, Asia/Calcutta]

Using fixed() for default Zone

// Java program to demonstrate 
// fixed() method of Clock class


import java.time.*;

// create class
public class fixedMethodDemo {

    // Main method
    public static void main(String[] args)
    {
        // create instance of clock class
        Instant instant = Instant.now();

        // create ZoneId for defaultZone which is UTC
        ZoneId zoneId = ZoneId.systemDefault();

        // call fixed method
        Clock clock = Clock.fixed(instant, zoneId);

        // print details of clock
        System.out.println(clock.toString());
    }
}

FixedClock[2018-08-21T08:10:32.498Z, Etc/UTC]

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