Compare 2 dates in cakePHP

Hello, Guys
& get ready 4 the problem

I want to validate 2 dates.

Field Type

id int(11)
game_name varchar(255)
start_date datetime
end_date datetime
created datetime
modified

In other way I want to validate the start_date against end_date.

End date should be greater that the start_date
I want the validation to occure in the model !

I've already done something like this, But it's not working!!

'start_date' => array(
'rule' => array('limitDuplicates'),
'message' => 'Date départ doit etre inferieure a celle de
fin !'
)

function limitDuplicates($check){
//$check will have value of start_date

return ...;
}

Thx in advance ;)

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