diff --git a/Model/Event.php b/Model/Event.php
index <HASH>..<HASH> 100644
--- a/Model/Event.php
+++ b/Model/Event.php
@@ -155,6 +155,8 @@ class Event
         $date['sec'] = $date['second'];
         unset($date['minute'], $date['second']);
 
+        $date['tz'] = 'Z';
+
         return $date;
     }
 }
[BUGFIX] Outlook would not accept floating Dates even with correct timezones present