diff --git a/plugins/calendar/calendar_ui.js b/plugins/calendar/calendar_ui.js
index a8642617..fe2b89e8 100644
--- a/plugins/calendar/calendar_ui.js
+++ b/plugins/calendar/calendar_ui.js
@@ -604,7 +604,7 @@ function rcube_calendar_ui(settings)
           priority: priority.val(),
           sensitivity: sensitivity.val(),
           status: eventstatus.val(),
-          recurrence: me.serialize_recurrence(),
+          recurrence: me.serialize_recurrence(endtime.val()),
           valarms: me.serialize_alarms('#edit-alarms'),
           attendees: event_attendees,
           deleted_attachments: rcmail.env.deleted_attachments,
diff --git a/plugins/calendar/lib/calendar_recurrence.php b/plugins/calendar/lib/calendar_recurrence.php
index b31026a8..fae98bbe 100644
--- a/plugins/calendar/lib/calendar_recurrence.php
+++ b/plugins/calendar/lib/calendar_recurrence.php
@@ -48,6 +48,16 @@ class calendar_recurrence extends libcalendaring_recurrence
     $this->init($event['recurrence'], $event['start']);
   }
 
+  /**
+   * Alias of libcalendaring_recurrence::next()
+   *
+   * @return mixed DateTime object or False if recurrence ended
+   */
+  public function next_start()
+  {
+    return $this->next();
+  }
+
   /**
    * Get the next recurring instance of this event
    *
@@ -55,7 +65,7 @@ class calendar_recurrence extends libcalendaring_recurrence
    */
   public function next_instance()
   {
-    if ($next_start = $this->next_start()) {
+    if ($next_start = $this->next()) {
       $next = $this->event;
       $next['recurrence_id'] = $next_start->format('Y-m-d');
       $next['start'] = $next_start;
diff --git a/plugins/libcalendaring/lib/libcalendaring_recurrence.php b/plugins/libcalendaring/lib/libcalendaring_recurrence.php
index 3423ae75..bbc4976c 100644
--- a/plugins/libcalendaring/lib/libcalendaring_recurrence.php
+++ b/plugins/libcalendaring/lib/libcalendaring_recurrence.php
@@ -52,17 +52,15 @@ class libcalendaring_recurrence
      * @param array  The recurrence properties
      * @param object DateTime The recurrence start date
      */
-    public function init($recurrence, $start)
+    public function init($recurrence, $start = null)
     {
-        $this->start = $start;
         $this->recurrence = $recurrence;
-        $this->dateonly = $start->_dateonly;
-        $this->next = new Horde_Date($start, $this->lib->timezone->getName());
-        $this->hour = $this->next->hour;
 
         $this->engine = new Horde_Date_Recurrence($start);
         $this->engine->fromRRule20(libcalendaring::to_rrule($recurrence));
 
+        $this->set_start($start);
+
         if (is_array($recurrence['EXDATE'])) {
             foreach ($recurrence['EXDATE'] as $exdate) {
                 if (is_a($exdate, 'DateTime')) {
@@ -79,12 +77,26 @@ class libcalendaring_recurrence
         }
     }
 
+    /**
+     * Setter for (new) recurrence start date
+     *
+     * @param object DateTime The recurrence start date
+     */
+    public function set_start($start)
+    {
+        $this->start = $start;
+        $this->dateonly = $start->_dateonly;
+        $this->next = new Horde_Date($start, $this->lib->timezone->getName());
+        $this->hour = $this->next->hour;
+        $this->engine->setRecurStart($this->next);
+    }
+
     /**
      * Get date/time of the next occurence of this event
      *
      * @return mixed DateTime object or False if recurrence ended
      */
-    public function next_start()
+    public function next()
     {
         $time = false;
         $after = clone $this->next;
@@ -131,7 +143,7 @@ class libcalendaring_recurrence
         if ($this->recurrence['COUNT']) {
             $last = $this->start;
             $this->next = new Horde_Date($this->start, $this->lib->timezone->getName());
-            while (($next = $this->next_start()) && $c < 1000) {
+            while (($next = $this->next()) && $c < 1000) {
                 $last = $next;
                 $c++;
             }
diff --git a/plugins/libcalendaring/libcalendaring.js b/plugins/libcalendaring/libcalendaring.js
index c3386845..1d93c13c 100644
--- a/plugins/libcalendaring/libcalendaring.js
+++ b/plugins/libcalendaring/libcalendaring.js
@@ -615,7 +615,7 @@ function rcube_libcalendaring(settings)
     /**
      * Gather recurrence settings from form
      */
-    this.serialize_recurrence = function()
+    this.serialize_recurrence = function(timestr)
     {
         var recurrence = '',
             freq = $('#edit-recurrence-frequency').val();
@@ -630,7 +630,7 @@ function rcube_libcalendaring(settings)
             if (until == 'count')
                 recurrence.COUNT = $('#edit-recurrence-repeat-times').val();
             else if (until == 'until')
-                recurrence.UNTIL = me.date2ISO8601(me.parse_datetime(endtime.val(), $('#edit-recurrence-enddate').val()));
+                recurrence.UNTIL = me.date2ISO8601(me.parse_datetime(timestr || '00:00', $('#edit-recurrence-enddate').val()));
 
             if (freq == 'WEEKLY') {
                 var byday = [];
diff --git a/plugins/libcalendaring/libcalendaring.php b/plugins/libcalendaring/libcalendaring.php
index 1b680a56..09a9c688 100644
--- a/plugins/libcalendaring/libcalendaring.php
+++ b/plugins/libcalendaring/libcalendaring.php
@@ -397,7 +397,10 @@ class libcalendaring extends rcube_plugin
     {
         return array_map(function($alarm){
             if ($alarm['trigger'][0] == '@') {
-                try { $alarm['trigger'] = new DateTime($alarm['trigger']); }
+                try {
+                    $alarm['trigger'] = new DateTime($alarm['trigger']);
+                    $alarm['trigger']->setTimezone(new DateTimeZone('UTC'));
+                }
                 catch (Exception $e) { /* handle this ? */ }
             }
             else if ($trigger = libcalendaring::parse_alaram_value($alarm['trigger'])) {