do not use intval

app/controllers/calendar/date.php

@@ -237,7 +237,7 @@ class Calendar_DateController extends AuthenticatedController
             } elseif (Request::submitted('defaultDate')) {
                 $date_parts = explode('-', Request::get('defaultDate'));
                 if (count($date_parts) === 3) {
-                    $time->setDate(intval($date_parts[0]), intval($date_parts[1]), intval($date_parts[2]));
+                    $time->setDate($date_parts[0], $date_parts[1], $date_parts[2]);
                 }
             }
             $time = $time->add(new DateInterval('PT1H'));