[Zope] searching dates in ZCatalog from external method

[Matthew Wilbert]

I am trying to call the ZCatalog searchResults method in an
external method, and I am not getting correct results,
so would like to know if anyone can tell me what I am
doing wrong.

This works correctly:

self.searchResults({'id' : '6','id_usage':'range:min'})

This doesn't (start is a DateTime field in the cataloged
objects)

self.searchResults({'start': DateTime('1999/01/01'),\
                    'start_usage':'range:min'})

It returns the id's of all the objects in the 
catalog (which is wrong).

Any ideas as to what have I screwed up?

Thanks for any help,

Matt Wilbert

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