Controllers\xAPI\DocumentController::getUpdatedValue PHP Метод

    public function getUpdatedValue()
    {
        $updated = \LockerRequest::header('Updated');
        // Checks the updated parameter.
        if (!empty($updated)) {
            if (!$this->validateTimestamp($updated)) {
                \App::abort(400, sprintf("`%s` is not an valid ISO 8601 formatted timestamp", $updated));
            }
        } else {
            $updated = Carbon::now()->toISO8601String();
        }
        return $updated;
    }