diff --git a/blog.php b/blog.php
index 6da8382..df810aa 100644
--- a/blog.php
+++ b/blog.php
@@ -266,7 +266,7 @@
  							echo ']]></description>
 	<link><![CDATA[' . $v->permalink . ']]></link>
 	<guid isPermaLink="true"><![CDATA[' . $v->permalink . ']]></guid>
-	<pubDate>' . date($RSS_DATE_FORMAT, $v->ctime) . '</pubDate>
+	<pubDate>' . date(RSS_DATE_FORMAT, $v->ctime) . '</pubDate>
 	<dc:creator>' . $v->author . '</dc:creator>
 </item>';
 						} else {
diff --git a/rss.php b/rss.php
index c7819d0..433756e 100644
--- a/rss.php
+++ b/rss.php
@@ -10,7 +10,7 @@
 		ob_start(function($output) {
 			global $tagSearch;
 			global $latestDisplayedPost;
-			$RSS_DATE_FORMAT = "D, d M Y H:i:s O";
+
 			if (!isset($latestDisplayedPost)) {
 				$latestDisplayedPost = time();
 			}
@@ -26,8 +26,8 @@
 		<title>' . PAGE_NAME . $tagSearchTitle . '</title>
 		<description><![CDATA[' . "Blog of " . PAGE_AUTHOR . $tagSearchTitle . ']]></description>
 		<link>' . getServerUrl() . '</link>
-		<lastBuildDate>' . date($RSS_DATE_FORMAT, $latestDisplayedPost) . '</lastBuildDate>
-		<pubDate>' . date($RSS_DATE_FORMAT, $latestDisplayedPost) . '</pubDate>
+		<lastBuildDate>' . date(RSS_DATE_FORMAT, $latestDisplayedPost) . '</lastBuildDate>
+		<pubDate>' . date(RSS_DATE_FORMAT, $latestDisplayedPost) . '</pubDate>
 		<ttl>' . RSS_REFRESH_INTERVAL . '</ttl>
 		<atom:link href="' . getServerUrl() . "/rss.php" . '" rel="self" type="application/rss+xml" />
 		' . $output;
diff --git a/shared.php b/shared.php
index 57d44e3..9c2a5ad 100644
--- a/shared.php
+++ b/shared.php
@@ -17,6 +17,8 @@
 	define('RSS_REFRESH_INTERVAL', 14400);		// Advertised update interval for the RSS feed
 	define('RSS_SHOW_FULL', false);			// Show extended section in RSS feed
 
+	define('RSS_DATE_FORMAT', 'D, d M Y H:i:s O');
+	
 	$menuItems = array(
 		array("label" => "Page A",	"link" => "?p=00-template",			"highlight" => "related-subpages,00-template"),
 		array("label" => "Page B",  	"link" => "?p=404",		"highlight" => "404"),