Tuesday 01 Jan New Year's Day
Wednesday 27 Mar Half trading day (Wednesday before Easter)
Thursday 28 Mar Maundy Thursday
Friday 29 Mar Good Friday
Monday 01 Apr Easter Monday
Wednesday 01 May Labour Day
Thursday 09 May Ascension Day
Friday 17 May Constitution Day
Monday 20 May Whit Monday
Tuesday 24 Dec Christmas Eve
Wednesday 25 Dec Christmas Day
Thursday 26 Dec Boxing Day
Tuesday 31 Dec New Year's Eve
Source: http://www.oslobors.no/ob_eng/Oslo-Boers/About-us/Opening-hours