addEntity не заносит данные

$Calendar = new Informationsystem_Controller_Show(Core_Entity::factory('Informationsystem', 6));
   
   $GetDistinctDates = Core_QueryBuilder::select()
    ->select('DATE(`property_value_datetimes`.`value`) AS dateonly')
    ->from('property_value_datetimes')
    ->where('property_value_datetimes.property_id', '=', 62)
   ->groupBy('dateonly');

   $Dates = $GetDistinctDates->execute()->asObject()->result();
   $XmlDatesEntity = Core::factory('Core_Xml_Entity')->name('Даты');
   $Calendar->addEntity($XmlDatesEntity);
   
   foreach ($Dates as $Date) {
      $XmlDatesEntity->addEntity(Core::factory('Core_Xml_Entity')->name('Дата')->value($Date -> dateonly));
   }

   $Calendar
      ->xsl(Core_Entity::factory('Xsl')->getByName('КалендарьЭкскурсий'))
      ->itemsProperties(true)
      ->itemsPropertiesList(true)
      ->limit(999)
      ->show();