Java Instant Class | atOffset() Method with Example

Instant Class atOffset() method: Here, we are going to learn about the atOffset() method of Instant Class with its syntax and example.
Submitted by Preeti Jain, on May 21, 2020

Instant Class atOffset() method

  • atOffset() method is available in java.time package.
  • atOffset() method is used to returns OffsetDateTime to merge this Instant with the given zone offset.
  • atOffset() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • atOffset() method may throw an exception at the time of representing Instant.
    DateTimeException: This exception may throw when the given parameter couldn’t adjust this Instant.

Syntax:

    public OffsetDateTime atOffset(ZoneOffset off);

Parameter(s):

  • ZoneOffset off – represents the zone offset to merge with this Instant.

Return value:

The return type of this method is OffsetDateTime, it returns OffsetDateTime object that holds the value merged this Instant with the given offset.

Example:

// Java program to demonstrate the example 
// of atOffset(ZoneOffset off) method 
// of Instant

import java.time.*;
public class AtOffsetOfInstant {
    public static void main(String args[]) {
        // Instantiates two Instant ,
        // two ZoneOffset
        Instant ins1 = Instant.parse("2006-04-03T05:10:15.00Z");
        Instant ins2 = Instant.parse("2007-06-05T10:20:30.00Z");
        ZoneOffset zo_off1 = ZoneOffset.ofTotalSeconds(10);
        ZoneOffset zo_off2 = ZoneOffset.ofHours(2);

        // Display ins1,ins2,zo_off1
        // and zo_off2
        System.out.println("Instant ins1 and ins2: ");
        System.out.println("ins1: " + ins1);
        System.out.println("ins2: " + ins2);
        System.out.println();
        System.out.println("ZoneOffset zo_off1 and zo_off2: ");
        System.out.println("Seconds to add: " + zo_off1);
        System.out.println("Hours to add: " + zo_off2);


        System.out.println();

        // Here, this method merges this Instant(ins1)
        // with the given ZoneOffset(zo_off1) i.e. here
        // we are adding zo_off1 (10 seconds) with 
        // the seconds of this Instant (ins1)
        OffsetDateTime off_da_time = ins1.atOffset(zo_off1);

        // Display off_da_time
        System.out.println("ins1.atOffset(zo_off1): " + off_da_time);

        // Here, this method merges this Instant(ins2)
        // with the given ZoneOffset(zo_off2) i.e. here
        // we are adding zo_off2 (2 hours) with 
        // the hours of this Instant (ins2)
        off_da_time = ins2.atOffset(zo_off2);

        // Display off_da_time
        System.out.println("ins2.atOffset(zo_off2): " + off_da_time);
    }
}

Output

Instant ins1 and ins2: 
ins1: 2006-04-03T05:10:15Z
ins2: 2007-06-05T10:20:30Z

ZoneOffset zo_off1 and zo_off2: 
Seconds to add: +00:00:10
Hours to add: +02:00

ins1.atOffset(zo_off1): 2006-04-03T05:10:25+00:00:10
ins2.atOffset(zo_off2): 2007-06-05T12:20:30+02:00






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