Getting Problems In Validating Date

I am using

array('user_authen_info_bday','type','type'=>'date','dateFormat' => 'd-M-yyyy'),

this to validate a date in 1-1-2014 format but it is not working .. rules checks that date is blank or not but they are not checking it is valid or not. and yup one more point the in yiiactiveform there is also not rule for the valid date .. there is a rule for blank date but not for valid date.. what i should do..? thanks in advance