/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
import java.time.* ;
import java.time.zone.*;
 
/* 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
	{
        final Instant now = Instant.now ( );
        final ZoneOffset offsetTarget = ZoneOffset.ofHours ( -4 );  // -04:00
 
        final Set < String > zoneNames = ZoneId.getAvailableZoneIds ( );
        final Collection < ZoneId > zoneIdsWithTargetOffset = new ArrayList <> ( );
        for ( String zoneName : zoneNames )
        {
            ZoneId zoneId = ZoneId.of ( zoneName );
            ZoneRules rules = zoneId.getRules ( );
            ZoneOffset offset = rules.getOffset ( now );
            if ( offset.equals ( offsetTarget ) )
            {
                zoneIdsWithTargetOffset.add ( zoneId );
            }
        }
        System.out.println ( "At " + now + ", " + zoneIdsWithTargetOffset.size ( ) + " zones have an offset of " + offsetTarget + " ➡️ " + zoneIdsWithTargetOffset ); // ️
 
	}
}

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