Stopping MaskedEditExtender from validating input in asp.net

I have an asp.net textbox and a MaskedEditExtender control attached to it. The textbox is used for date input. The MaskedEditExtender has MaskType="Date" Mask="99/99/9999".

When the form is submitted with an invalid date, the browser shows a Javascript error "... string was not recognized as a valid datetime".

I know why the error shows up. Is there a way to use the extender to just control what the user enters and not validate or convert the input? 
Stopping MaskedEditExtender from validating input in asp.net
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I have an asp.net textbox and a MaskedEditExtender control attached to it. The textbox is used for date input. The MaskedEditExtender has MaskType="Date" Mask="99/99/9999".

When the form is submitted with an invalid date, the browser shows a Javascript error "... string was not recognized as a valid datetime".

I know why the error shows up. Is there a way to use the extender to just control what the user enters and not validate or convert the input? 