Index: units/helpers/minifiers/minify_helper.php
===================================================================
--- units/helpers/minifiers/minify_helper.php	(revision 14826)
+++ units/helpers/minifiers/minify_helper.php	(working copy)
@@ -112,7 +112,7 @@
 			$file_helper =& $this->Application->recallObject('FileHelper');
 			/* @var $file_helper FileHelper */
 
-			return $file_helper->pathToUrl($dst_file) . '?ts=' . filemtime($dst_file);
+			return $file_helper->pathToUrl($dst_file) . '?ts=' . adodb_date('Y-m-d_H:i:s', filemtime($dst_file));
 		}
 
 		/**