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Java Clock Class | millis() Method with Example

Clock Class millis() method: Here, we are going to learn about the millis() method of Clock Class with its syntax and example.
Submitted by Preeti Jain, on May 13, 2020

Clock Class millis() method

• millis() method is available in java.time package.
• millis() method is used to represent the current instant in milliseconds of this Clock.
• millis() method is a non-static method, it is accessible with the class object and if we try to access the method with the class name then we will get an error.
• millis() method may throw an exception at the time of returning instant in milliseconds.
  DateTimeException: This exception may throw when no instant couldn't be generated (i.e. invalid instant is used with this Clock).

Syntax:

    public long millis();

Parameter(s):

• None

Return value:

The return type of this method is long, it returns the current instant in milliseconds that is used with this Clock.

Example:

// Java program to demonstrate the example 
// of millis() method of Clock

import java.time.*;

public class MillisOfClock {
    public static void main(String args[]) {
        // Instantiates two ZoneId for Accra and Asmara
        ZoneId zone_1 = ZoneId.of("Africa/Accra");
        ZoneId zone_2 = ZoneId.of("Africa/Asmara");

        // Initialize two Clock objects  
        Clock cl1 = Clock.system(zone_1);
        Clock cl2 = Clock.system(zone_2);

        // returns the current millisecond 
        // instant value of this Clock cl1
        long cl_millis = cl1.millis();

        // Display cl1 millis instant
        System.out.println("cl1.millis(): " + cl_millis);

        // returns the current millisecond 
        // instant value of this Clock cl2
        cl_millis = cl2.millis();

        // Display cl2 millis instant
        System.out.println("cl2.millis(): " + cl_millis);
    }
}

Output

cl1.millis(): 1589396151574
cl2.millis(): 1589396151628