"attemptonlast". Seems to work.
// This fragment is called by moodle_needs_upgrading() and /admin/index.php
////////////////////////////////////////////////////////////////////////////////
-$module->version = 2003080301; // The (date) version of this module
+$module->version = 2003080400; // The (date) version of this module
$module->cron = 0; // How often should cron check this module (seconds)?
?>