My iPhone's clock doesn't work?

So I have jail broken my iPhone to Pangu's iOS 8.1 jailbreak and now my clock doesn't work. It just crashes when I open it please help

Pangu is still quite buggy, check to see if you have any updates on Cydia. Also what do you have installed? A lot of apps and tweaks are not compatible with iOS 8 So it could be something you have installed, tried uninstalling things 1 by 1 to see if that fixes it.