LocalDateTime ofInstant() method in Java with Examples

ofInstant(Instant instant, ZoneId zone) method of LocalDateTime class in Java is used to create an instance of LocalDateTime using an Instant and zone ID. These two parameters are passed to the method and method returns LocalDateTime on the basis of these two parameters. The calculation of the LocalDateTime follows the following step.

1. The zone Id and instant are used to obtain the offset from UTC/Greenwich as there can be only one valid offset for each instance.
2. Finally, the local date-time is calculated using the instant and the obtained offset.

Syntax:

public static LocalDateTime 
       ofInstant(Instant instant,
                 ZoneId zone)

Parameters: The method accepts two parameters:

• instant – It is of Instant type and represents the instant passed to create localdatetime.
• zone – It is of ZoneId type and represents the time-zone used for creating the offset.

Return Value: This method returns the localdate-time.

Exceptions: This method throws DateTimeException if the result exceeds the supported range.

Below programs illustrate the ofInstant(Instant instant, ZoneId zone) method in Java:

Program 1:

// Java program to demonstrate
// LocalDateTime.ofInstant(
// Instant instant, ZoneId zone) method

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

public class GFG {
    public static void main(String[] args)
    {
        // Create LocalDateTime object
        LocalDateTime localdatetime
            = LocalDateTime.ofInstant(
                Instant.now(),
                ZoneId.systemDefault());

        // Print full date
        System.out.println(
            "Date: " + localdatetime);
    }
}

Output:

Date: 2020-05-13T12:40:38.087

Program 2:

// Java program to demonstrate
// LocalDateTime.ofInstant(
// Instant instant, ZoneId zone) method

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

public class GFG {
    public static void main(String[] args)
    {
        // Create LocalDateTime object
        LocalDateTime localdatetime
            = LocalDateTime.ofInstant(
                Instant.now(),
                ZoneId.systemDefault());

        // Print year only
        System.out.println(
            "Year: " + localdatetime.getYear());
    }
}

Output:

Year: 2020

References:https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#ofInstant(java.time.Instant, java.time.ZoneId)