ChronoLocalDateTime toEpochSecond() method in Java with Examples

The toEpochSecond() method of a ChronoLocalDateTime class is used to convert this ChronoLocalDateTime to the number of seconds since the epoch of 1970-01-01T00:00:00Z. The method combines this ChronoLocalDateTime 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(ZoneOffset offset)

Parameters: This method accepts a parameters offset which is the zone offset.



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:

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// Java program to demonstrate
// ChronoLocalDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime
                  .parse("2019-12-31T19:15:30");
  
        // print ChronoLocalDateTime
        System.out.println("ChronoLocalDateTime: "
                           + time);
  
        // create ZoneId
        ZoneOffset zone = ZoneOffset.of("Z");
  
        // print ZoneId
        System.out.println("Passed ZoneOffset: "
                           + zone);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond(zone));
    }
}

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Output:

ChronoLocalDateTime: 2019-12-31T19:15:30
Passed ZoneOffset: Z
Epoch Second: 1577819730

Program 2:

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// Java program to demonstrate
// ChronoLocalDateTime.toEpochSecond() method
  
import java.time.*;
import java.time.chrono.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create ChronoLocalDateTime object
        ChronoLocalDateTime time
            = LocalDateTime.parse(
                "2018-10-25T23:12:31.123");
  
        // print ChronoLocalDateTime
        System.out.println("ChronoLocalDateTime: "
                           + time);
  
        // create ZoneId
        ZoneOffset zone = ZoneOffset.of("Z");
  
        // print ZoneId
        System.out.println("Passed ZoneOffset: "
                           + zone);
  
        // print result
        System.out.println("Epoch Second: "
                           + time.toEpochSecond(zone));
    }
}

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Output:

ChronoLocalDateTime: 2018-10-25T23:12:31.123
Passed ZoneOffset: Z
Epoch Second: 1540509151

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/ChronoLocalDateTime.html#toEpochSecond-java.time.ZoneOffset-



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