Index: wp-includes/classes.php
===================================================================
--- wp-includes/classes.php	(revision 4275)
+++ wp-includes/classes.php	(working copy)
@@ -1036,6 +1036,7 @@
 				$front = $front . 'date/';
 				break;
 			}
+			$tok_index++;
 		}
 
 		$this->date_structure = $front . $date_endian;