diff --git a/lib/ext/Syncroton/Model/EmailMeetingRequest.php b/lib/ext/Syncroton/Model/EmailMeetingRequest.php
index 2786be4..3379e20 100644
--- a/lib/ext/Syncroton/Model/EmailMeetingRequest.php
+++ b/lib/ext/Syncroton/Model/EmailMeetingRequest.php
@@ -1,98 +1,96 @@
 <?php
 /**
  * Syncroton
  *
  * @package     Syncroton
  * @subpackage  Model
  * @license     http://www.tine20.org/licenses/lgpl.html LGPL Version 3
  * @copyright   Copyright (c) 2012-2012 Metaways Infosystems GmbH (http://www.metaways.de)
  * @author      Lars Kneschke <l.kneschke@metaways.de>
  */
 
 /**
  * class to handle Email:MeetingRequest
  *
  * @package     Syncroton
  * @subpackage  Model
  * @property    bool     AllDayEvent
  * @property    int      BusyStatus
  * @property    int      DisallowNewTimeProposal
  * @property    DateTime DtStamp
  * @property    DateTime EndTime
  * @property    string   GlobalObjId
  * @property    int      InstanceType
  * @property    int      MeetingMessageType
  * @property    string   Organizer
  * @property    string   RecurrenceId
  * @property    array    Recurrences
  * @property    int      Reminder
  * @property    int      ResponseRequested
  * @property    int      Sensitivity
  * @property    DateTime StartTime
  * @property    string   Timezone
  */
 class Syncroton_Model_EmailMeetingRequest extends Syncroton_Model_AXMLEntry
 {
     /**
      * busy status constants
      */
     const BUSY_STATUS_FREE      = 0;
     const BUSY_STATUS_TENATTIVE = 1;
     const BUSY_STATUS_BUSY      = 2;
     const BUSY_STATUS_OUT       = 3;
 
     /**
      * sensitivity constants
      */
     const SENSITIVITY_NORMAL       = 0;
     const SENSITIVITY_PERSONAL     = 1;
     const SENSITIVITY_PRIVATE      = 2;
     const SENSITIVITY_CONFIDENTIAL = 3;
 
     /**
      * instanceType constants
      */
     const TYPE_NORMAL              = 0;
     const TYPE_RECURRING_MASTER    = 1;
     const TYPE_RECURRING_SINGLE    = 2;
     const TYPE_RECURRING_EXCEPTION = 3;
 
     /**
      * messageType constants
      */
     const MESSAGE_TYPE_NORMAL      = 0;
     const MESSAGE_TYPE_REQUEST     = 1;
     const MESSAGE_TYPE_FULL_UPDATE = 2;
     const MESSAGE_TYPE_INFO_UPDATE = 3;
     const MESSAGE_TYPE_OUTDATED    = 4;
     const MESSAGE_TYPE_COPY        = 5;
     const MESSAGE_TYPE_DELEGATED   = 6;
 
-    protected $_dateTimeFormat = "Ymd\THis\Z";
-
     protected $_xmlBaseElement = 'MeetingRequest';
 
     protected $_properties = array(
         'Email' => array(
             'allDayEvent'               => array('type' => 'number'),
             'busyStatus'                => array('type' => 'number'),
             'disallowNewTimeProposal'   => array('type' => 'number'),
             'dtStamp'                   => array('type' => 'datetime'),
             'endTime'                   => array('type' => 'datetime'),
             'globalObjId'               => array('type' => 'string'),
             'instanceType'              => array('type' => 'datetime'),
             'location'                  => array('type' => 'string'),
             'organizer'                 => array('type' => 'string'), //e-mail address
             'recurrenceId'              => array('type' => 'datetime'),
             'recurrences'               => array('type' => 'container'),
             'reminder'                  => array('type' => 'number'),
             'responseRequested'         => array('type' => 'number'),
             'sensitivity'               => array('type' => 'number'),
             'startTime'                 => array('type' => 'datetime'),
             'timeZone'                  => array('type' => 'timezone'),
         ),
         'Email2' => array(
             'meetingMessageType'        => array('type' => 'number'),
         ),
     );
 }