yii - how to show date in expirydate column -

how show date in expirydate column 5 time more of original date. i.e. have column name created , have deafult date(7/19/2023) in expiry date column want show date (7/24/2013) when save expiry date 5 more original date?

public function rules(){     return array(             array('title','required'),             array('jobid,notes,companyid,createdon,expirydate','safe'),             array('createdon','default',                     'value'=>new cdbexpression('now()'),                     'setonempty'=>false,'on'=>'update'),             array('createdon,expirydate','default',                     'value'=>new cdbexpression('now()'),                     'setonempty'=>false,'on'=>'insert')     ); } 

you can use strtotime calculate expirydate:

$time = strtotime('+5 days', strtotime($model->createdon)); $model->expirydate = date('m/d/y', $time );