static function daysOfTheWeek($startFrom = 'Monday', $format = 'l')
    {
        $result      = [];
        $start       = new self($startFrom);
        $interval    = \DateInterval::createFromDateString('1 day');
        $recurrences = 6;
        foreach (new \DatePeriod($start, $interval, $recurrences) as $date) {
            $result[] = $date->format($format);
        }
        return $result;
    }