CakeResponse::expires() Fatal Error

I'm using cake 2.2.2 and trying to set expires headers.

in my AppController.php

public function beforeRender(){
CakeResponse::expires(new DateTime('+5 day'));
}

but i got this error

Fatal error: Call to undefined method CakeErrorController::_getUTCDate() in F:\www\mail-us\lib\Cake\Network\CakeResponse.php on line 858

please help.

p/s : i'm trying this on individual action but got the same error. 

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