[Zope] Python2.3 datetime VS Zope DateTime

I'm now trying to publish a set of database-related logics through zope. Some of them return a python2.3's datetime object which its member access are disallowed from zope. (DTML, ZPT) I want to access some of datetime's member-methods, like strftime & isocalendar. How can I make it accessible from zope ? Or how can I make Zope automagically convert it to Zope's DateTime. I really don't want to change my logics to use Zope's DateTime. Thanks.