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Java Instant Class | toEpochMilli() Method with Example

Instant Class toEpochMilli() method: Here, we are going to learn about the toEpochMilli() method of Instant Class with its syntax and example.
Submitted by Preeti Jain, on May 28, 2020

Instant Class toEpochMilli() method

• toEpochMilli() method is available in java.time package.
• toEpochMilli() method is used to convert this Instant into the number of milliseconds from the Java epoch standard format since 1970-01-01T00:00:00Z.
• toEpochMilli() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
• toEpochMilli() method does not throw an exception at the time of converting this Instant to milliseconds.

Syntax:

    public long toEpochMilli();

Parameter(s):

• None

Return value:

The return type of this method is long, it returns the conversion value into number of epoch milliseconds since 1970-01-01T00:00:00Z.

Example:

// Java program to demonstrate the example 
// of long toEpochMilli() method 
// of Instant

import java.time.*;
import java.time.temporal.*;

public class ToEpochMilliOfInstant {
    public static void main(String args[]) {
        // Instantiates two Instant
        Instant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");
        Instant ins2 = Instant.now();

        // Display ins1,ins2 
        System.out.println("Instant ins1 and ins2: ");
        System.out.println("ins1: " + ins1);
        System.out.println("ins2: " + ins2);

        System.out.println();

        // Here, this method converts this Instant 
        // ins1 into number of milliseconds from the
        // java epoch of 1970-01-01T00:00:00Z
        long to_epoc_milli = ins1.toEpochMilli();

        // Display to_epoc_milli
        System.out.println("ins1.toEpochMilli(): " + to_epoc_milli);

        // Here, this method converts this Instant 
        // ins2 into number of milliseconds from the
        // java epoch of 1970-01-01T00:00:00Z
        to_epoc_milli = ins2.toEpochMilli();

        // Display to_epoc_milli
        System.out.println("ins2.toEpochMilli(): " + to_epoc_milli);
    }
}

Output

Instant ins1 and ins2: 
ins1: 2006-04-03T05:10:15Z
ins2: 2020-05-27T05:41:56.830391Z

ins1.toEpochMilli(): 1144041015000
ins2.toEpochMilli(): 1590558116830