Day Date Month Holiday Wednesday 12 Apr Half trading day (Wednesday before Easter) Thursday 13 Apr Maundy Thursday Friday 14 Apr Good Friday Monday 17 Apr Easter Monday Monday 01 May Labour Day Wednesday 17 May Constitution Day Thursday 25 May Ascension Day Monday 05 Jun Whit Monday Monday 25 Dec Christmas Day Tuesday 26 Dec Boxing Day Source: http://www.oslobors.no/ob_eng/Oslo-Boers/About-Oslo-Boers/Opening-hours