Hello,

I added new methods for Datepicker validation, here is my patch for latest version

new methods: isMaxDate, isMinDate, isDateInRange

now It is possible to validate Datepicker dates with validate plugin

$.validator.methods.dateMin = function (value, element, param) { 

return $(element).datepicker('isMinDate'); 

}; 

$.validator.methods.dateMax = function (value, element, param) { 

return $(element).datepicker('isMaxDate'); 

}; 

$.validator.methods.dateRange = function (value, element, param) { 

return $(element).datepicker('isDateInRange'); 

};

my last outdated patch http://dev.jquery.com/ticket/2832