Day Date Month Holiday
Sunday 01 Jan New Year's Day
Thursday 13 Apr Maundy Thursday
Friday 14 Apr Good Friday
Sunday 16 Apr Easter Day
Monday 17 Apr Easter Monday
Friday 12 May Great Prayer Day
Thursday 25 May Ascension Day
Sunday 04 Jun Whit Sunday
Monday 05 Jun Whit Monday
Monday 25 Dec Christmas Day
Tuesday 26 Dec 2nd Christmas Day
Source: https://www.timeanddate.com/holidays/denmark/2017#!hol=9