[Zope] Forms + MySQL + DateTime = a mess

[Dennis Allison]

I think I have finally traced down at least some of my problem.
The MySQL DA adaptor is smart -- for DateTime columns it wants a 
DateTime object and it returns a DateTime object.  Mixing strings
and DateTime objects is not a good idea so I have modified my 
stuff to keep everything as a string until it goes into the 
database (or there's a need for a DateTime quantity) and, when 
it comes out from the database and is needed as a string, I 
force an explicit conversion.  Simple, but hard to track down when
the infomation flow is complex.