public function getStepFormat()
    {
        if ($this->lang == 'en') {
            switch ($this->step) {
                case self::$YEARLY:
                    return 'Y';
                    break;
                case self::$MONTHLY:
                    return 'Y-m';
                    break;
                case self::$DAILY:
                    return 'Y-m-d';
                    break;
                case self::$HOURLY:
                    return 'Y-m-d H:00';
                    break;
            }
        } elseif ($this->lang == 'fr') {
            switch ($this->step) {
                case self::$YEARLY:
                    return 'Y';
                    break;
                case self::$MONTHLY:
                    return 'm/Y';
                    break;
                case self::$DAILY:
                    return 'd/m/Y';
                    break;
                case self::$HOURLY:
                    return 'd/m/Y H:00';
                    break;
            }
        }

        return false;
    }