public function getAllTimezoneFlat()
    {
        $aTimezones = $this->getAllTimezone();
        $aOut       = [];

        foreach ($aTimezones as $sKey => $mValue) {
            if (is_array($mValue)) {
                foreach ($mValue as $subKey => $subValue) {
                    if (is_string($subValue)) {
                        $aOut[$subKey] = $sKey . ' - ' . $subValue;
                    }
                }
            } else {
                $aOut[$sKey] = $mValue;
            }
        }

        return $aOut;
    }