Thursday 01 Jan New Year's Day
Sunday 05 Apr Easter Day
Monday 06 Apr Easter Monday
Monday 27 Apr King's Birthday
Tuesday 05 May Liberation Day
Thursday 14 May Ascension Day
Sunday 24 May Whit Sunday
Monday 25 May Whit Monday
Friday 25 Dec Christmas Day
Saturday 26 Dec Second Day of Christmas
Source: https://www.timeanddate.com/holidays/netherlands/2015#!hol=9