[Zope] ZClasses & date properties

[Tim Moore]

OK, now that I've settled my title property conundrum by just calling
the property "name" instead :-\ I go to add a "date" property to my
ZClass and find that it doesn't like that either.  Specifically, it
won't let me add a property of type date with no value, giving me an
"Invalid Date-Time String" error.  I take it that empty date fields
aren't allowed then...is this intended or a bug?  Still using 2.3b1.
-- 
Tim Moore