private function getTimeCase()
    {
        $from = $this->from;
        $to = $this->to;

        // Single hour event
        if (!$to || $to->format('Hi') === $from->format('Hi')) {
            if ($to->format('i') == 0) {
                return 'single_round';
            }

            return 'single';
        }

        $fromTime = [
            'hour'   => $from->format('H'),
            'minute' => $from->format('i'),
        ];

        $toTime = [
            'hour'   => $to->format('H'),
            'minute' => $to->format('i'),
        ];

        $case = null;
        $case = $fromTime['hour'] !== $toTime['hour'] ? 'different_time' : $case;
        $case = $fromTime['minute'] == 0 ? 'different_time_round' : $case;
        $case = $fromTime['minute'] != $toTime['minute'] ? 'different_time' : $case;

        return $case;
    }