ChronoLocalDateTime toInstant() method in Java with Examples

The toInstant() method of a ChronoLocalDateTime class is used to convert this ChronoLocalDateTime to an Instant. The method combines this ChronoLocalDateTime with the offset passed as parameters to calculate the Instant.

Syntax:

default Instant toInstant(ZoneOffset offset)

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

Return value: This method returns Instant which is the Instant of this ChronoLocalDateTime

Below programs illustrate the toInstant() method:

Program 1:

// Java program to demonstrate
// ChronoLocalDateTime.toInstant() 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("Instant: "
                           + time.toInstant(zone));
    }
}

Output:

ChronoLocalDateTime: 2019-12-31T19:15:30
Passed ZoneOffset: Z
Instant: 2019-12-31T19:15:30Z

Program 2:

// Java program to demonstrate
// ChronoLocalDateTime.toInstant() 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("Instant: "
                           + time.toInstant(zone));
    }
}

Output:

ChronoLocalDateTime: 2018-10-25T23:12:31.123
Passed ZoneOffset: Z
Instant: 2018-10-25T23:12:31.123Z

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