public function beforeValidate()
{
if ($this->date_begin != null) {
$new_date_begin = date('Y-m-d', strtotime($this->date_begin));
$this->date_begin = $new_date_begin;
}
if ($this->date_end != null) {
$new_date_end = date('Y-m-d', strtotime($this->date_end));
$this->date_end = $new_date_end;
}
return parent::beforeValidate();
}
