From 95b98257b16d235084d0910218541f3b9e1ce331 Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <alec@alec.pl>
Date: Wed, 5 Aug 2015 12:46:05 +0200
Subject: [PATCH] Fix possible javascript error in parseISO8601() (#5175)

---
 plugins/libcalendaring/libcalendaring.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/plugins/libcalendaring/libcalendaring.js b/plugins/libcalendaring/libcalendaring.js
index 25f9b86f..bdb2f1d0 100644
--- a/plugins/libcalendaring/libcalendaring.js
+++ b/plugins/libcalendaring/libcalendaring.js
@@ -123,6 +123,11 @@ function rcube_libcalendaring(settings)
      */
     this.parseISO8601 = function(s)
     {
+        // already a Date object?
+        if (s && s.getMonth) {
+            return s;
+        }
+
         // force d to be on check's YMD, for daylight savings purposes
         var fixDate = function(d, check) {
             if (+d) { // prevent infinite looping on invalid dates