From fb4f815e532aebed80bfba806621e61322faaf4c Mon Sep 17 00:00:00 2001
From: Aleksander Machniak <machniak@kolabsys.com>
Date: Sat, 22 Nov 2014 12:10:06 -0500
Subject: [PATCH] Fix bug where DateTime($date, null) throws an exception
 (#3965)

---
 plugins/libkolab/lib/kolab_format.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/plugins/libkolab/lib/kolab_format.php b/plugins/libkolab/lib/kolab_format.php
index 8c6b1d45..625483b7 100644
--- a/plugins/libkolab/lib/kolab_format.php
+++ b/plugins/libkolab/lib/kolab_format.php
@@ -223,7 +223,7 @@ abstract class kolab_format
                 if ($tz) $datetime->setTimezone($tz);
             }
             else if (is_string($datetime) && strlen($datetime)) {
-                $datetime = new DateTime($datetime, $tz ?: null);
+                $datetime = $tz ? new DateTime($datetime, $tz) : new DateTime($datetime);
             }
         }
         catch (Exception $e) {}