public function test() {
        CarbonPeriod::macro('calculateParkingDayHours', function () {
            echo '<pre>';
            var_dump($this->toArray());
            echo '</pre>';
            exit;

            return $this;
        });

        CarbonPeriod::macro('calculateParkingNightHours', function () {
            echo '<pre>';
            var_dump($this->toArray());
            echo '</pre>';
            exit;

            return $this;
        });

        $registeredAt = Carbon::createFromFormat('Y-m-d H:i:s', '2018-12-10 10:00:00');
        $leftAt = Carbon::createFromFormat('Y-m-d H:i:s', '2018-12-10 12:00:00');

        $nightStarts = Carbon::createFromFormat('Y-m-d H:i:s', $registeredAt->format('Y-m-d') . ' 18:00:00');
        $nightEnds = Carbon::createFromFormat('Y-m-d H:i:s', $leftAt->format('Y-m-d') . ' 08:00:00');

        $dayStarts = Carbon::createFromFormat('Y-m-d H:i:s', $registeredAt->format('Y-m-d') . ' 08:00:00');
        $dayEnds = Carbon::createFromFormat('Y-m-d H:i:s', $leftAt->format('Y-m-d') . ' 18:00:00');

        $parkedPeriod = new CarbonPeriod($registeredAt->toDateTimeString(), '1 hour', $leftAt->toDateTimeString()/*, CarbonPeriod::EXCLUDE_START_DATE */);

        $dayHours = $parkedPeriod->calculateParkingDayHours();
        $nightHours = $parkedPeriod->calculateParkingNightHours();

        $this->data['dayHours'] = $dayHours;
        $this->data['nightHours'] = $nightHours;

        return response()->json($this->data);
    }