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); }} |
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); }} |
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); }} |
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)
