--- locallib.old.php	2013-03-31 21:18:14.250981153 +0200
+++ locallib.php	2013-03-31 21:43:46.883004151 +0200
@@ -618,16 +618,6 @@
                 assign_reset_gradebook($data->courseid);
             }
         }
-        // Updating dates - shift may be negative too.
-        if ($data->timeshift) {
-            shift_course_mod_dates('assign',
-                                    array('duedate', 'allowsubmissionsfromdate','cutoffdate'),
-                                    $data->timeshift,
-                                    $data->courseid);
-            $status[] = array('component'=>$componentstr,
-                              'item'=>get_string('datechanged'),
-                              'error'=>false);
-        }
 
         return $status;
     }