Entering 31/31/2009 results in a validated field, except that the value of the input field changes into "31/07/2011", which is obviously not the same as the (invalid) date input of "31/31/2009".
Also, when entering a valid date (dateFormat:'%d/%m/%Y') such as "31/02/1999" messes things up, as it changes into "02/07/2001"
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The date validator doesn't work correctly in FF4 and IE9 (no others tested except Chrome, which works)
See: http://jsfiddle.net/LgJsN/1809/
Entering 31/31/2009 results in a validated field, except that the value of the input field changes into "31/07/2011", which is obviously not the same as the (invalid) date input of "31/31/2009".
Also, when entering a valid date (dateFormat:'%d/%m/%Y') such as "31/02/1999" messes things up, as it changes into "02/07/2001"