[Zope] Whats the Format of Date in portal_catalog( )??

[saravanan annamalai]

Hi All,
     I want to get the news items by date. for eg...news items 
created on a particular date.

   I tried with container.portal_catalog(created='2003-08-13'),
              container.portal_catalog(created='2003/08/13') and 
many other....

But i am not getting anything in result...though i have some 
data...

Is there any problem with date format...??? if yes please specify 
me the correct format??

Expecting your replies at the earliest
bye from saravanan A

A.Saravanan,
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