protected function seedDays()
    {
        $this->output->info('### Seeding days###');
        //%u	ISO-8601 numeric representation of the day of the week	1 (for Monday) through 7 (for Sunday)
        $timestamp = strtotime('next Monday');
        $days = array();
        for ($i = 1; $i < 8; $i++) {
            $days[$i] = strftime('%A', $timestamp);
            $timestamp = strtotime('+1 day', $timestamp);
        }

        foreach ($days as $dayNumber => $day) {
            $this->output->info('### Seeding day: ' . $day . ' ###');
            $dayModel = Day::firstOrNew([
                'code' => $dayNumber,
                ]
            );
            $dayModel->name = $day;
            $dayModel->code = $dayNumber;
            $dayModel->lective = true;
            if ($dayNumber == 6 || $dayNumber == 7) {
                $dayModel->lective = false;
            }
            $dayModel->save();
        }
        $this->output->info('### END Seeding days###');
    }