From f996823fe9e4bf503712e796bd475a0d1905d025 Mon Sep 17 00:00:00 2001
From: Julio Montoya <gugli100@gmail.com>
Date: Fri, 14 Dec 2012 12:38:14 +0100
Subject: [PATCH] Fixing warning message

---
 main/inc/lib/internationalization.lib.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/main/inc/lib/internationalization.lib.php b/main/inc/lib/internationalization.lib.php
index 6f890e5842..9e87f6d11e 100644
--- a/main/inc/lib/internationalization.lib.php
+++ b/main/inc/lib/internationalization.lib.php
@@ -659,7 +659,9 @@ function api_get_local_time($time = null, $to_timezone = null, $from_timezone =
  */
 function api_strtotime($time, $timezone = null) {
     $system_timezone = date_default_timezone_get();
-    date_default_timezone_set($timezone);
+    if (!empty($timezone)) {
+        date_default_timezone_set($timezone);
+    }
     $timestamp = strtotime($time);
     date_default_timezone_set($system_timezone);
     return $timestamp;