[Zope] on dates

I'm trying to format a Date retrieved from MySQL, but while I can print the date as it is I can't access any of the methods, so no strftime() and no day() etc I get a 'not allowed in this context' exception so: <i tal:content="python:item.data"></i> is ok but: <i tal:content="python:item.data.day"></i> causes Zope to ask for authentication Zope 2.7.2, Python 2.3.4 here any hint would be appreciated thanks massimo