Variable week converted to int

classes/timetable.php

@@ -114,7 +114,7 @@ class timetable {
       $this->monday->sub(new \DateInterval("P".($dayofweek-1)."D"));
     }
 
-    $this->week = $this->monday->format("W");
+    $this->week = intval($this->monday->format("W"));
     $this->lastday = new \DateTime($this->monday->format('Y-m-d\TH:i:sP'));
     $this->lastday->add(new \DateInterval("P".($this->numdayweek-1)."D"));