Codeigniter の timezone が America/Chicago の件 UTCに設定

サーバーの設定も php.ini の date.timezone も UTC で間違いないのに…
America/Chicagoで表示される…？？？

centosの設定は UTC

# timedatectl
               Local time: 金 2023-06-16 02:30:54 UTC
           Universal time: 金 2023-06-16 02:30:54 UTC
                 RTC time: 金 2023-06-16 02:30:54
                Time zone: UTC (UTC, +0000)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

phpも問題なく

# php -i | grep timezone
Default timezone => UTC
date.timezone => UTC => UTC

なぜかcodeigniterを実行すると

$ php public/index.php tools/test/getTimezone
America/Chicago

codeigniterに設定がありました。。。

    /**
     * --------------------------------------------------------------------------
     * Application Timezone
     * --------------------------------------------------------------------------
     *
     * The default timezone that will be used in your application to display
     * dates with the date helper, and can be retrieved through app_timezone()
     *
     * @var string
     */
    public $appTimezone = 'UTC';
    // public $appTimezone = 'America/Chicago';