Index: kernel/processors/main_processor.php
===================================================================
--- kernel/processors/main_processor.php	(revision 15437)
+++ kernel/processors/main_processor.php	(working copy)
@@ -1037,8 +1037,8 @@
 			$nextyear = intval(date('Y') + 1);
 
 			$format = "D, d M Y H:i:s";
-			$expiration = gmdate($format, mktime() + $params['cache']) . ' GMT';
-			$last_modified = mktime();
+			$expiration = gmdate($format, time() + $params['cache']) . ' GMT';
+			$last_modified = time();
 
 			header('Cache-Control: public, cache, max-age=' . $params['cache']);
 			header("Expires: $expiration");