When in cell edit mode, or in a form edit, I cannot enter a date…

Here is the model:

{name:'HireDate',index:'HireDate',width:100,search:false,resizable:false,label:'Hire Date',groupName:'Legacy Data',classes:'editable',editable:true,align:'center',formatter:'date',datefmt:'M d, Y',editrules:{date:true},formatoptions:{newformat:'M d, Y',srcformat:'Y-m-d'}},

When I enter “Oct 01, 2008”, I get an error like this:

Hire Date: Please, enter valid date value – M d, Y

What else needs to be done?

Glen