Ctimestampbehavior Malfunctioning With Afterfind() In Model

I am using CTimeStampBehaviour for setting create_time and update_time resetting create_time with afterFind() in model, Basically I am setting the format of date to be displayed on the front end. But this does not work as create_time is sent 0000-00-00 00:00:00 on using model's afterFind(). It works fine when I comment afterFind() in model.

I have used this function in my model:

public function behaviors(){
return array(
    'CTimestampBehavior' => array(
        'class' => 'zii.behaviors.CTimestampBehavior',
        'createAttribute' => 'create_time',
        'updateAttribute' => 'update_time',
        'setUpdateOnCreate'=> true,
    )
);
}

I have seen the documentation on CTimeStampBehavior class on yii site, it has a reference to afterFind() inheritence but does not suggest how to use it. I am using afterFind() in model like this:

protected function afterFind() {
parent::afterFind();
$this->create_time = Yii::app()->dateFormatter->formatDateTime(
        CDateTimeParser::parse(
            $this->create_time, 'yyyy-MM-dd hh:mm:ss'
        ), 'short', 'short'
    );
return true;
}

Can anyone suggest why the create_time is being zero filled when using afterFind()?