Date_Holidays_Filter_Whitelist | --Date_Holidays_Filter_Netherlands_Official
Date_Holidays_Filter_Netherlands_Official Date_Holidays_Filter_Netherlands_Official( )
Only accepts official Dutch public holidays as described on http://ec.europa.eu/taxation_customs/dds/cgi-bin/cshoquer?Lang=EN&Country=NL/
Date_Holidays_Filter_Netherlands_Official __construct( )