diff --git a/inc/caldav-PUT-functions.php b/inc/caldav-PUT-functions.php
index 0824b244..e1e47c32 100644
--- a/inc/caldav-PUT-functions.php
+++ b/inc/caldav-PUT-functions.php
@@ -1482,8 +1482,10 @@ function write_resource( DAVResource $resource, $caldav_data, DAVResource $colle
   $calitem_params[':dtstart_orig'] = $dtstart;
 
   if ( empty($dtstart) ) $dtstart = $due;
-  if (isset($dtstart) && preg_match("/^1[0-8][0-9][0-9][01][0-9][0-3][0-9]$/", $dtstart))
+  if (isset($dtstart) && preg_match("/^1[0-8][0-9][0-9][01][0-9][0-3][0-9]$/", $dtstart)) {
      $dtstart = $dtstart . "T000000Z";
+     $calitem_params[':dtstart_orig'] = $dtstart;
+  }
   $calitem_params[':dtstart'] = $dtstart;
 
   $dtend = $first->GetPValue('DTEND');
@@ -1491,8 +1493,10 @@ function write_resource( DAVResource $resource, $caldav_data, DAVResource $colle
 
   if ( isset($dtend) && $dtend != '' ) {
     dbg_error_log( 'PUT', ' DTEND: "%s", DTSTART: "%s", DURATION: "%s"', $dtend, $dtstart, $first->GetPValue('DURATION') );
-    if (preg_match("/^1[0-8][0-9][0-9][01][0-9][0-3][0-9]$/", $dtend))
+    if (preg_match("/^1[0-8][0-9][0-9][01][0-9][0-3][0-9]$/", $dtend)) {
        $dtend = $dtend . "T000000Z";
+       $calitem_params[':dtend_orig'] = $dtend;
+    }
     $calitem_params[':dtend'] = $dtend;
     $dtend = ':dtend';
   }