The year 2012 starts with January 1st being a sunday, but the market will close exactly twice as often as previous year. With closed markets I mean scheduled public holidays, not the frequent market shut down caused by system trouble at Euronext.
- Friday 6 April 2012 (Good Friday)
- Monday 9 april 2012 (Easter Monday)
- Tuesday 1 May 2012 (Labour day)
- Tuesday 25 December 2012 (Christmas)
- Wednesday 26 December 2012 (Boxing Day)
In addition, markets will close early on December 24th and 31th. Same calendar applies for the Eurex, but with their foreign derivatives you may wish to double check here.