Thursday 01 Jan New Year's Day
Wednesday 01 Apr Half trading day (Wednesday before Easter)
Thursday 02 Apr Maundy Thursday
Friday 03 Apr Good Friday
Monday 06 Apr Easter Monday
Friday 01 May Labour Day
Thursday 14 May Ascension Day
Monday 25 May Whit Monday
Thursday 24 Dec Christmas Eve
Friday 25 Dec Christmas Day
Thursday 31 Dec New Year's Eve
Source: http://www.oslobors.no/ob_eng/Oslo-Boers/About-us/Opening-hours