How to display all UTC offset in Java 8

By Atul Rai | Last Updated: July 10, 2020

In Java 8, we can use ZoneId.getAvailableZoneIds() to get all unique zone id and LocalDateTime to get UTC offset of that zone id.

1. Stream API

GetAllUTC.java
package org.websparrow.java8;

import java.time.LocalDateTime;
import java.time.ZoneId;

public class GetAllUTC {

	public static void main( String[] args ) {

		LocalDateTime localDateTime = LocalDateTime.now();

		ZoneId.getAvailableZoneIds()
			.stream()
			.map( ZoneId::of )
			.map( zoneId -> localDateTime.atZone( zoneId )
				.getOffset()
				.getId()
				.replaceAll( "Z", "+00:00" ) )
			.forEach( e -> System.out.println( "UTC " + e ) );
	}
}

2. Enhanced For Loop

LocalDateTime localDateTime = LocalDateTime.now();

for ( String zoneId : ZoneId.getAvailableZoneIds() ) {

	String utc = localDateTime.atZone( ZoneId.of( zoneId ) )
		.getOffset()
		.getId()
		.replaceAll( "Z", "+00:00" );
	System.out.println( "UTC " + utc );
}
console
UTC +03:00
UTC -04:00
UTC -09:00
UTC -08:00
UTC +03:00
UTC -04:00
UTC +05:00
UTC +12:00
UTC -06:00
UTC +07:00
UTC +02:00
UTC -11:00
UTC +02:00
UTC +08:00
UTC -10:00
UTC -10:00
UTC -06:00
UTC +10:00
UTC +01:00
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UTC -05:00
UTC +08:00
UTC -06:00
UTC -04:00
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UTC +00:00
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UTC -05:00
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UTC -04:00
UTC +10:00
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References

  1. Class ZoneId
  2. Java 8– Calculate date & time difference between two Zone
  3. Java 8 – Difference between two LocalDate
  4. Java 8 – Calculate difference between two LocalDateTime

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About the Author

Atul Rai
I love sharing my experiments and ideas with everyone by writing articles on the latest technological trends. Read all published posts by Atul Rai.