SQL Adapter Updategram datetime default is 19000101   

How can I generate an updategram that forces a datetime column to <NULL>?  If 
the XML data tags exist in the source document, the updategram creates a 
datetime="" attribute, which then translates back to 1900/01/01.

date: Mon, 3 Apr 2006 10:44:02 -0700   author:   Glenn