Index: branches/5.1.x/core/kernel/db/cat_dbitem.php
===================================================================
diff -u -N -r13545 -r13811
--- branches/5.1.x/core/kernel/db/cat_dbitem.php	(.../cat_dbitem.php)	(revision 13545)
+++ branches/5.1.x/core/kernel/db/cat_dbitem.php	(.../cat_dbitem.php)	(revision 13811)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: cat_dbitem.php 13545 2010-05-11 19:19:58Z alex $
+* @version	$Id: cat_dbitem.php 13811 2010-07-07 09:41:05Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -107,10 +107,14 @@
 	function Update($id=null, $system_update=false)
 	{
 		$this->VirtualFields['ResourceId'] = Array();
-		$this->SetDBField('Modified', adodb_mktime() );
-		$this->UpdateFormattersSubFields(array('Modified'));
-		$this->SetDBField('ModifiedById', $this->Application->RecallVar('user_id'));
 
+		if ($this->GetChangedFields()) {
+			$now = adodb_mktime();
+			$this->SetDBField('Modified_date', $now);
+			$this->SetDBField('Modified_time', $now);
+			$this->SetDBField('ModifiedById', $this->Application->RecallVar('user_id'));
+		}
+
 		if ($this->useFilenames) {
 			$this->checkFilename();
 			$this->generateFilename();