diff --git a/PowerPrice/module.php b/PowerPrice/module.php
index 8b543cc..b1d1356 100644
--- a/PowerPrice/module.php
+++ b/PowerPrice/module.php
@@ -262,11 +262,11 @@ private function FetchFromTibber($postalCode)
         foreach ($energy as $hour) {
             $date = explode('-', $hour['date']);
             $result[] = [
-                'start' => mktime($hour['hour'], 0, 0, $date[1], $date[2], $date[0]),
-                'end'   => mktime($hour['hour'] + 1, 0, 0, $date[1], $date[2], $date[0]),
+                'start' => mktime($hour['hour'], 0, 0, intval($date[1]), intval($date[2]), intval($date[0])),
+                'end'   => mktime($hour['hour'] + 1, 0, 0, intval($date[1]), intval($date[2]), intval($date[0])),
                 'price' => $hour['priceIncludingVat'],
             ];
         }
         return json_encode($result);
     }
-}
\ No newline at end of file
+}