diff --git a/application/default/controllers/DataController.php b/application/default/controllers/DataController.php
index 811f3d33..5854883d 100755
--- a/application/default/controllers/DataController.php
+++ b/application/default/controllers/DataController.php
@@ -267,6 +267,9 @@ class DataController extends Zend_Controller_Action
     */
     function timelineAction()
     {
+    	$fn="time.xml";
+    	if (!file_exists($fn) || (time()-filemtime($fn)>3600*24))
+    	{ 
     	$dateformat="D M j Y G:i:s O";
     	$md = new MetadataTable();
     	$db=$md->getAdapter();
@@ -286,6 +289,7 @@ class DataController extends Zend_Controller_Action
     	$fp=fopen('time.xml','w');
     	fwrite($fp,$timexml);
     	fclose($fp);
+    	}
 		//$this->_helper->layout->disableLayout();
     }
     /*