diff --git a/public/typo3conf/ext/ep_products/Classes/BpnConnect/ApiClient.php b/public/typo3conf/ext/ep_products/Classes/BpnConnect/ApiClient.php
index 4b674f59..5baf99b3 100644
--- a/public/typo3conf/ext/ep_products/Classes/BpnConnect/ApiClient.php
+++ b/public/typo3conf/ext/ep_products/Classes/BpnConnect/ApiClient.php
@@ -13,14 +13,27 @@ use TYPO3\CMS\Core\Utility\GeneralUtility;
 
 class ApiClient
 {
-    public function getCalendar($hotelCode, \DateTimeInterface $dateFrom, \DateTimeInterface $dateTo): array
-    {
+    public const CALENDAR_MODE_DAYS = 'days';
+    public const CALENDAR_MODE_RANGES = 'ranges';
+
+    public function getCalendar(
+        $hotelCode,
+        \DateTimeInterface $dateFrom,
+        \DateTimeInterface $dateTo = null,
+        string $mode = self::CALENDAR_MODE_DAYS
+    ): array {
+        $query = [
+            'hotelCode' => $hotelCode,
+            'dateFrom' => $dateFrom->format('Y-m-d'),
+            'mode' => $mode,
+        ];
+
+        if (null !== $dateTo) {
+            $query['dateTo'] = $dateTo->format('Y-m-d');
+        }
+
         $response = $this->request('GET', 'api/v1/contingents/calendar', [
-            'query' => [
-                'hotelCode' => $hotelCode,
-                'dateFrom' => $dateFrom->format('Y-m-d'),
-                'dateTo' => $dateTo->format('Y-m-d'),
-            ],
+            'query' => $query,
         ]);
 
         $this->assertStatusCode($response, [Response::HTTP_OK], 'GET', 'api/v1/contingents/calendar');
diff --git a/public/typo3conf/ext/ep_products/Classes/Controller/AjaxCalendarController.php b/public/typo3conf/ext/ep_products/Classes/Controller/AjaxCalendarController.php
index af9401d1..fb60965b 100644
--- a/public/typo3conf/ext/ep_products/Classes/Controller/AjaxCalendarController.php
+++ b/public/typo3conf/ext/ep_products/Classes/Controller/AjaxCalendarController.php
@@ -80,7 +80,12 @@ class AjaxCalendarController extends ActionController
             $calendar['error'] = true;
         } else {
             try {
-                $cacheIdentifier = $this->getCacheIdentifier($hotelCode, $apiDateFrom, $apiDateTo);
+                $cacheIdentifier = $this->getCacheIdentifier(
+                    $hotelCode,
+                    $apiDateFrom,
+                    $apiDateTo,
+                    ApiClient::CALENDAR_MODE_DAYS
+                );
                 $cachedCalendar = $this->cache->get($cacheIdentifier);
 
                 if (false !== $cachedCalendar) {
@@ -89,7 +94,8 @@ class AjaxCalendarController extends ActionController
                     $calendar = $this->apiClient->getCalendar(
                         $hotelCode,
                         new \DateTimeImmutable($apiDateFrom),
-                        new \DateTimeImmutable($apiDateTo)
+                        new \DateTimeImmutable($apiDateTo),
+                        ApiClient::CALENDAR_MODE_DAYS
                     );
                     $this->cache->set($cacheIdentifier, $calendar, [], self::CACHE_TTL);
                 }
@@ -158,12 +164,13 @@ class AjaxCalendarController extends ActionController
         ];
     }
 
-    private function getCacheIdentifier(string $hotelCode, string $dateFrom, string $dateTo): string
+    private function getCacheIdentifier(string $hotelCode, string $dateFrom, string $dateTo, string $mode): string
     {
         return 'bpn_connect_calendar_' . sha1(implode('|', [
             $hotelCode,
             $dateFrom,
             $dateTo,
+            $mode,
         ]));
     }
 
diff --git a/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php b/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
index 869c3af6..324f1958 100644
--- a/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
+++ b/public/typo3conf/ext/ep_products/Classes/Service/IcalService.php
@@ -34,7 +34,6 @@ use TYPO3\CMS\Core\SingletonInterface;
 
 class IcalService implements SingletonInterface
 {
-    private const FEED_HORIZON = 'P1Y';
     private const SUMMARY_UNAVAILABLE = 'Unavailable';
 
     /**
@@ -66,10 +65,14 @@ class IcalService implements SingletonInterface
 
         if ($hotelCode !== '') {
             $dateFrom = new \DateTimeImmutable('today');
-            $dateTo = $dateFrom->add(new \DateInterval(self::FEED_HORIZON))->sub(new \DateInterval('P1D'));
 
             try {
-                $calendar = $this->apiClient->getCalendar($hotelCode, $dateFrom, $dateTo);
+                $calendar = $this->apiClient->getCalendar(
+                    $hotelCode,
+                    $dateFrom,
+                    null,
+                    ApiClient::CALENDAR_MODE_RANGES
+                );
                 $calendarRows = isset($calendar['data']) && is_array($calendar['data']) ? $calendar['data'] : [];
             } catch (\Throwable $e) {
                 $calendarRows = [];
@@ -92,41 +95,28 @@ class IcalService implements SingletonInterface
     protected function generateUnavailableItems(array $calendarRows): void
     {
         usort($calendarRows, function (array $left, array $right): int {
-            return strcmp((string) ($left['date'] ?? ''), (string) ($right['date'] ?? ''));
+            return strcmp((string) ($left['date_from'] ?? ''), (string) ($right['date_from'] ?? ''));
         });
 
-        $blockStart = null;
-        $lastDate = null;
-
         foreach ($calendarRows as $row) {
-            if (!isset($row['date'])) {
+            if (!isset($row['date_from'], $row['date_to'])) {
                 continue;
             }
 
-            $date = new \DateTimeImmutable($row['date']);
-            $lastDate = $date;
-
-            if ($this->isUnavailableStatus($row['status'] ?? 'OK')) {
-                if (null === $blockStart) {
-                    $blockStart = $date;
-                }
-
+            if (!$this->isUnavailableStatus($row['status'] ?? 'OK')) {
                 continue;
             }
 
-            if (null !== $blockStart) {
-                $this->addBlockedItem([
-                    'from' => $blockStart,
-                    'to' => $date,
-                ]);
-                $blockStart = null;
+            $dateFrom = new \DateTimeImmutable($row['date_from']);
+            $dateTo = new \DateTimeImmutable($row['date_to']);
+
+            if ($dateTo < $dateFrom) {
+                continue;
             }
-        }
 
-        if (null !== $blockStart && null !== $lastDate) {
             $this->addBlockedItem([
-                'from' => $blockStart,
-                'to' => $lastDate->add(new \DateInterval('P1D')),
+                'from' => $dateFrom,
+                'to' => $dateTo->add(new \DateInterval('P1D')),
             ]);
         }
     }