iOS calendar crashed on March 2013 When selecting March 2013 in the Month view, Calendar crashes. Does anyone know what could be the cause of this ?

Ps: I tried march 2012 and the weekly view for march 2013 and there is no problem. 
Ps2: it's on a iPad 3 with iOS 6.0.1 
Ps3: I've tried the same thing on my father's iPad : It's crashes also on march 2013. (the synchronized calendar are totaly different)  
Ps4: Just found out that Facebook's birthdays are crashing the app on my iPad.
I would like to report that the update to iOS 6.1 solves this problem. I had the issue and now it's gone.