yii\validators\DateValidator::parseDateValue PHP Метод

    protected function parseDateValue($value)
    {
        // TODO consider merging these methods into single one at 2.1
        return $this->parseDateValueFormat($value, $this->format);
    }

 /**
  * @inheritdoc
  */
 protected function parseDateValue($value)
 {
     if ($value instanceof \MongoDate) {
         return $value->sec;
     }
     return parent::parseDateValue($value);
 }