diff --git a/public/typo3conf/ext/ep_products/Classes/Service/GroupsSwissService.php b/public/typo3conf/ext/ep_products/Classes/Service/GroupsSwissService.php
index 292858e5..b3727066 100644
--- a/public/typo3conf/ext/ep_products/Classes/Service/GroupsSwissService.php
+++ b/public/typo3conf/ext/ep_products/Classes/Service/GroupsSwissService.php
@@ -26,7 +26,6 @@ namespace EP\EpProducts\Service;
  *  This copyright notice MUST APPEAR in all copies of the script!
  ***************************************************************/
 
-use CalendR\Period\Range;
 use Doctrine\DBAL\DBALException;
 use EP\EpProducts\Domain\Model\Contingent;
 use EP\EpProducts\Domain\Model\Hotel;
@@ -183,8 +182,8 @@ class GroupsSwissService implements SingletonInterface, LoggerAwareInterface
     protected function resetChart(Period $range, $apiKey, $houseNumber): void
     {
         $item = [
-            'from' => $range->getStartDate()->format('Y-m-d'),
-            'to' => $range->getEndDate()->format('Y-m-d'),
+            'from' => $range->getStartDate(),
+            'to' => $range->getEndDate(),
         ];
 
         $this->addItem($item, 0, $apiKey, $houseNumber);