ChronoZonedDateTime toEpochSecond() method in Java with Examples

The toEpochSecond() method of a ChronoZonedDateTime interface is used to convert this ChronoZonedDateTime to the number of seconds since the epoch of 1970-01-01T00:00:00Z. The method combines this ChronoZonedDateTime with the offset passed as parameters to calculate the epoch-second value, which is the number of elapsed seconds from 1970-01-01T00:00:00Z. Instants on the timeline after the epoch are positive, earlier are negative.

Syntax:

default long toEpochSecond()

Parameters: This method do not accepts any parameter.

Return value: This method returns long which is the number of seconds since the epoch of 1970-01-01T00:00:00Z, may be negative.

Below programs illustrate the toEpochSecond() method:

Program 1:

// Java program to demonstrate
// ChronoZonedDateTime.toEpochSecond() method

import java.time.*;
import java.time.chrono.*;
import java.time.chrono.*;

public class GFG {
    public static void main(String[] args)
    {

        // create ChronoZonedDateTime object
        ChronoZonedDateTime time
            = ZonedDateTime
                  .parse(
                      "2018-12-06T19:21:12.123+05:30[Asia/Calcutta]");

        // print ChronoZonedDateTime
        System.out.println("ChronoZonedDateTime: "
                           + time);

        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond());
    }
}

Output:

ChronoZonedDateTime: 2018-12-06T19:21:12.123+05:30[Asia/Calcutta]
Epoch Second: 1544104272

Program 2:

// Java program to demonstrate
// ChronoZonedDateTime.toEpochSecond() method

import java.time.*;
import java.time.chrono.*;
import java.time.chrono.*;

public class GFG {
    public static void main(String[] args)
    {

        // create ChronoZonedDateTime object
        ChronoZonedDateTime time
            = ZonedDateTime.parse(
                "1918-10-25T23:12:38.543+02:00[Europe/Paris]");

        // print ChronoZonedDateTime
        System.out.println("ChronoZonedDateTime: "
                           + time);

        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond());
    }
}

Output:

ChronoZonedDateTime: 1918-10-25T23:12:38.543Z[Europe/Paris]
Epoch Second: -1615250842

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoZonedDateTime.html#toEpochSecond–