Java Instant atZone() method

The atZone() method of Java Instant class is used to combine the instant with a time-zone to create a ZonedDateTime.

Syntax

Parameters

Zone - The Zone to combine with, not null.

Return

The Zone date-time formed from this instant and the specified Zone, not null.

Exceptions

DateTimeException - If the result exceeds the supported range.

Example 1

import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;
import java.util.Set;

public class InstantAtZoneExample1 {
   public static void main(String[] args) {

      Instant instant = Instant.parse("2017-02-03T10:37:30.00Z");
      System.out.println(instant);  
      
      Set<String> zones = ZoneId.getAvailableZoneIds();
      
      ZoneId zone = ZoneId.of(zones.iterator().next());
      
      ZonedDateTime  date = instant.atZone(zone);
      System.out.println(date);  
   }
}

Output:

The output will be like this.

2018-07-17T10:37:30Z
2017-07-17T13:37:30+03:00[Asia/Aden]

Example 2

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;
import java.time.ZonedDateTime;

public class InstantAtZoneExample2{
  public static void main(String args[]) {
    //Starting with an java.time.Instant value
    Instant timeStamp= Instant.now();
    System.out.println("Machine Time Now:" + timeStamp);
 
    //timeStamp in zone - "Asia/New_Delhi"
    ZonedDateTime LAZone= timeStamp.atZone(ZoneId.of("Asia/New_Delhi"));
    System.out.println("In New Delhi(Asia) Time Zone:"+ LAZone);
 
    //timeStamp in zone - "GMT+01:00"
    ZonedDateTime timestampAtGMTPlus1= timeStamp.atZone(ZoneId.of("GMT+01:00"));
    System.out.println("In 'GMT+01:00' Time Zone:"+ timestampAtGMTPlus1);
  }
}

Output:

Machine Time Now :   2016-11-29T14:23:25.551Z
In New Delhi(Asia) Time Zone :   2018-07-17T06:23:25.551-08:00[Asia/New_Delhi]
In 'GMT+01:00' Time Zone :   2016-07-17T15:23:25.551+01:00[GMT+01:00]

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