case 39: if (event.ctrlKey || event.metaKey) $.datepicker._adjustDate(event.target, (isRTL ? -1 : +1), 'D');
                        handled = event.ctrlKey || event.metaKey;
                        // +1 day on ctrl or command +right
                        if (event.originalEvent.altKey) $.datepicker._adjustDate(event.target, (event.ctrlKey ?
                                    +$.datepicker._get(inst, 'stepBigMonths') :