diff --git a/plugins/calendar/skins/larry/calendar.css b/plugins/calendar/skins/larry/calendar.css
index 4a035cb0..c8f36b14 100644
--- a/plugins/calendar/skins/larry/calendar.css
+++ b/plugins/calendar/skins/larry/calendar.css
@@ -2222,6 +2222,11 @@ div.calendar-invitebox td em {
 	font-weight: bold;
 }
 
+div.calendar-invitebox td.date.modified {
+	font-weight: bold;
+	color: red;
+}
+
 #event-rsvp .rsvp-buttons,
 div.calendar-invitebox .itip-buttons div {
 	margin-top: 0.5em;
diff --git a/plugins/libcalendaring/lib/libcalendaring_itip.php b/plugins/libcalendaring/lib/libcalendaring_itip.php
index c6eef240..c7986175 100644
--- a/plugins/libcalendaring/lib/libcalendaring_itip.php
+++ b/plugins/libcalendaring/lib/libcalendaring_itip.php
@@ -359,8 +359,8 @@ class libcalendaring_itip
     {
       $action = $event['rsvp'] ? 'rsvp' : '';
       $status = $event['fallback'];
-      $latest = false;
-      $html = '';
+      $latest = $resheduled = false;
+      $html   = '';
 
       if (is_numeric($event['changed']))
         $event['changed'] = new DateTime('@'.$event['changed']);
@@ -384,6 +384,13 @@ class libcalendaring_itip
               break;
             }
           }
+
+          // Detect re-sheduling
+          if (!$latest) {
+            // FIXME: This is probably to simplistic, or maybe we should just check
+            //        attendee's RSVP flag in the new event?
+            $resheduled = $existing['start'] != $event['start'] || $existing['end'] > $event['end'];
+          }
         }
         else {
           $rsvp = $event['rsvp'] && $this->rc->config->get('calendar_allow_itip_uninvited', true);
@@ -406,6 +413,9 @@ class libcalendaring_itip
           else if (!$existing && !$rsvp) {
             $action = 'import';
           }
+          else if ($resheduled) {
+            $action = 'rsvp';
+          }
           else if ($status_lc != 'needs-action') {
             $action = !$latest ? 'update' : '';
           }
@@ -453,14 +463,15 @@ class libcalendaring_itip
       }
 
       return array(
-          'uid' => $event['uid'],
-          'id' => asciiwords($event['uid'], true),
-          'existing' => $existing ? true : false,
-          'saved' => $existing ? true : false,
-          'latest' => $latest,
-          'status' => $status,
-          'action' => $action,
-          'html' => $html,
+          'uid'        => $event['uid'],
+          'id'         => asciiwords($event['uid'], true),
+          'existing'   => $existing ? true : false,
+          'saved'      => $existing ? true : false,
+          'latest'     => $latest,
+          'status'     => $status,
+          'action'     => $action,
+          'resheduled' => $resheduled,
+          'html'       => $html,
       );
     }
 
diff --git a/plugins/libcalendaring/libcalendaring.js b/plugins/libcalendaring/libcalendaring.js
index 985271e1..c15fa048 100644
--- a/plugins/libcalendaring/libcalendaring.js
+++ b/plugins/libcalendaring/libcalendaring.js
@@ -1287,10 +1287,14 @@ rcube_libcalendaring.update_itip_object_status = function(p)
     $('#rsvp-'+p.id+' input.button').prop('disabled', false)
       .filter('.'+String(p.status||'unknown').toLowerCase()).prop('disabled', p.latest);
   }
- 
+
   // show rsvp/import buttons (with calendar selector)
   $('#'+p.action+'-'+p.id).show().find('input.button').last().after(p.select);
 
+  // highlight date if date change detected
+  if (p.resheduled)
+    $('.calendar-eventdetails td.date').addClass('modified');
+
   // show itip box appendix after replacing the given placeholders
   if (p.append && p.append.selector) {
     var elem = $(p.append.selector);