diff --git a/infolog/inc/class.infolog_groupdav.inc.php b/infolog/inc/class.infolog_groupdav.inc.php
index cde1989340..8ce0756f7e 100644
--- a/infolog/inc/class.infolog_groupdav.inc.php
+++ b/infolog/inc/class.infolog_groupdav.inc.php
@@ -623,6 +623,7 @@ class infolog_groupdav extends groupdav_handler
 	private function _get_handler()
 	{
 		$handler = new infolog_ical();
+		$handler->tzid = false;	//	as we read server-time timestamps (!= null=user-time), exports UTC times
 		$handler->setSupportedFields('GroupDAV',$this->agent);
 
 		return $handler;
diff --git a/infolog/inc/class.infolog_ical.inc.php b/infolog/inc/class.infolog_ical.inc.php
index 810ceb44ba..f5fd9e6b16 100644
--- a/infolog/inc/class.infolog_ical.inc.php
+++ b/infolog/inc/class.infolog_ical.inc.php
@@ -171,7 +171,6 @@ class infolog_ical extends infolog_bo
 		$vcal->setAttribute('METHOD',$_method);
 
 		$tzid = $this->tzid;
-
 		if ($tzid && $tzid != 'UTC')
 		{
 			// check if we have vtimezone component data for tzid of event, if not default to user timezone (default to server tz)
@@ -312,7 +311,7 @@ class infolog_ical extends infolog_bo
 		}
 		if ($taskData['info_enddate'])
 		{
-			self::setDateOrTime($vevent, 'DUE', $taskData['info_enddate'], false); // export always as date
+			self::setDateOrTime($vevent, 'DUE', $taskData['info_enddate'], $tzid);
 		}
 		if ($taskData['info_datecompleted'])
 		{
@@ -365,6 +364,7 @@ class infolog_ical extends infolog_bo
 	static function setDateOrTime(&$vevent, $attr, $time, $tzid)
 	{
 		$params = array();
+		$time_in = $time;
 
 		if ($tzid)
 		{
@@ -395,7 +395,8 @@ class infolog_ical extends infolog_bo
 			$value = array(
 				'year'  => $arr['year'],
 				'month' => $arr['month'],
-				'mday'  => $arr['day']);
+				'mday'  => $arr['day'],
+			);
 			$params['VALUE'] = 'DATE';
 		}
 		else
@@ -414,6 +415,7 @@ class infolog_ical extends infolog_bo
 				$value = egw_time::to($time, 'ts');
 			}
 		}
+		//error_log(__METHOD__."(, '$attr', ".array2string($time_in).', '.array2string($tzid).') tz='.$tz->getName().', value='.array2string($value).(is_int($value)?date('Y-m-d H:i:s',$value):''));
 		$vevent->setAttribute($attr, $value, $params);
 	}