/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
import java.time.* ;
import java.util.stream.Collectors ;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
 
		Instant instant = Instant.now() ;
		ZoneOffset targetOffset = ZoneOffset.ofHours( 6 ) ;
		List< ZoneId > zonesUsingDesiredOffset = 
		    ZoneId
		    .getAvailableZoneIds()  // Returns a `Set` of `String` objects, the names of each known time zone.
		    .stream()
		    .map( zoneName -> ZoneId.of( zoneName ) )  // Map each zone name to `ZoneId` object.
		    .filter(
		        zoneId -> zoneId.getRules().getOffset( instant ).equals( targetOffset )  // Filter for zones whose offset at specified moment matches our desired offset.
		    )
		    .collect( Collectors.toList() )
		;
 
		System.out.println( zonesUsingDesiredOffset ) ;
 
	}
}

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