DUTCH HOLIDAYS:
0. ---January 1st--- (Sunday this year)
0. ---Easter--- (always a Sunday)
1. Day after easter
1. ---May 5--- (only years ending in 5, 0)
2. April 27
3. May 25
3. ---7 weeks after Easter--- (always a Sunday)
4. 7 weeks after the day after Easter
5. Christmas
6. The day after Christmas