New Year's Day (Nieuwjaarsdag) on 1st of January:

January 1

Dutch King's Day (Koningsdag) on 27th of April:

April 27

Birthday (Verjaardag) on 16th of June:

June 16

Christmas Day (Eerste Kerstdag) on 25th of December:

December 25

Boxing Day (Tweede Kerstdag) on 26th of December:

December 26