public static function getCodeFromTimezone($sTimezone)
    {
        $aAbbreviations = \DateTimeZone::listAbbreviations();
        foreach ($aAbbreviations as $sCode => $aValues) {
            foreach ($aValues as $aValue) {
                if ($aValue['timezone_id'] == $sTimezone) {
                    return strtoupper($sCode);
                }
            }
        }

        return false;
    }