[Zope] Accessing mxDateTime within python scripts

Hi all, I need several DateTime Funcion to create a mini-tutos system. So I tried to imort the mxDateTime libraries, but this doesn't work at all. from mx.DateTime import * results to You are not allowed to access DateTime in this context. Can anybody give me some advice how to handle with this, or are there other DateTime Function available in Python (I didn't find DateTime Function in the Python Docu) ? Thanks for helping, Bernhard K.