private function setHolidayForState(&$holidays, $day, $state, $name)
    {
        // Exists?
        if (! array_key_exists($day, $holidays)) {
            // Initialized as State Holiday
            $holidays[$day] = $this->createData($name, []);
        }
        // Is a state holiday?
        if (is_array($holidays[$day]['states'])) {
            // Include Current State
            $holidays[$day]['states'][] = $state;
        }
    }