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Instant atOffset() method in Java with Examples

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  • Last Updated : 22 Nov, 2018
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The atOffset(ZoneOffset offset) method of Instant class is used to combine this instant with an offset to create an OffsetDateTime object. This method takes ZoneOffset as a parameter to return an OffsetDateTime object and this OffsetDataTime object is formed from this instant at the specified offset from UTC/Greenwich. If the instant is too large to fit into an offset date-time then the method will throw an exception. This method is same as OffsetDateTime.ofInstant(this, offset).

Syntax:

public OffsetDateTime atOffset(ZoneOffset offset)

Parameters:
This method accepts one parameter offset which is the ZoneOffset to combine with this instant object. It should not be null

Return Value: This method returns the offset date-time formed from this instant and the specified ZoneOffset.

Exception: This method throws DateTimeException if the instant is too large to fit into an offset date-time.

Below programs illustrate the Instant.atOffset() method:
Program 1:




// Java program to demonstrate
// Instant.atOffset() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.parse("2018-10-20T16:55:30.00Z");
  
        // print Instant Value
        System.out.println("Instant: "
                           + instant);
  
        // create a ZoneOffset object
        // with 7200 sec means 2 hours
        ZoneOffset offset = ZoneOffset.ofTotalSeconds(7200);
  
        // apply atOffset method to combine ZoneOffset
        // to this instant
        OffsetDateTime offsetDate = instant.atOffset(offset);
  
        // print results
        System.out.println("Offset Date and Time: "
                           + offsetDate);
    }
}

Output:

Instant: 2018-10-20T16:55:30Z
Offset Date and Time: 2018-10-20T18:55:30+02:00

Program 2:




// Java program to demonstrate
// Instant.atOffset() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.parse("2018-10-20T16:55:30.00Z");
  
        // print Instant Value
        System.out.println("Instant: "
                           + instant);
  
        // create a ZoneOffset object
        // with 3 hours 45 minutes
        ZoneOffset offset
            = ZoneOffset.ofHoursMinutes(3, 45);
  
        // apply atOffset method to combine ZoneOffset
        // to this instant
        OffsetDateTime offsetDate
            = instant.atOffset(offset);
  
        // print results
        System.out.println("Offset Date and Time: "
                           + offsetDate);
    }
}

Output:

Instant: 2018-10-20T16:55:30Z
Offset Date and Time: 2018-10-20T20:40:30+03:45

Program 3:




// Java program to demonstrate
// Instant.atOffset() method
  
import java.time.*;
  
public class GFG {
    public static void main(String[] args)
    {
  
        // create an instance object
        Instant instant
            = Instant.now();
  
        // print Instant Value
        System.out.println("Instant: "
                           + instant);
  
        // create a ZoneOffset Object
        // with 9 hours 45 minutes 30 second
        ZoneOffset offset
            = ZoneOffset
                  .ofHoursMinutesSeconds(9, 45, 30);
  
        // apply atOffset method to
        // combine ZoneOffset to this instant
        OffsetDateTime offsetDate
            = instant.atOffset(offset);
  
        // print results
        System.out.println("Offset Date and Time: "
                           + offsetDate);
    }
}

Output:

Instant: 2018-11-22T08:22:19.846Z
Offset Date and Time: 2018-11-22T18:07:49.846+09:45:30

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/Instant.html#atOffset(java.time.ZoneOffset)


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