Null or 0 values in dijit.form.datetextbox

I'm using a standard output of开发者_Go百科 Zend_Dojo_Element_DateTextbox AKA dijit.form.datetextbox... I want to use NULL or 0 values, but it always defaults to 11/30/1899... is there a simple option to enable this??

DateTextBox accepts a NULL or empty string... it just screws up when you insert a 0 (zero).