diff --git a/lib/rsslib.php b/lib/rsslib.php
index d615aab8359..82f4fb5b8b3 100644
--- a/lib/rsslib.php
+++ b/lib/rsslib.php
@@ -224,8 +224,8 @@ function rss_add_items($items) {
             $result .= rss_full_tag('title',3,false,strip_tags($item->title));
             $result .= rss_full_tag('link',3,false,$item->link);
             $result .= rss_add_enclosures($item);
-            $result .= rss_full_tag('pubDate',3,false,date('D, d M Y H:i:s T',$item->pubdate));
-            //Include the author if exists
+            $result .= rss_full_tag('pubDate',3,false,gmdate('D, d M Y H:i:s',$item->pubdate).' GMT');  # MDL-12563
+            //Include the author if exists 
             if (isset($item->author)) {
                 //$result .= rss_full_tag('author',3,false,$item->author);
                 //We put it in the description instead because it's more important