{lib, ...}: {
  # https://en.wikipedia.org/wiki/List_of_tz_database_time_zones
  # `timedatectl list-timezones`
  time.timeZone = "Asia/Taipei";

  i18n = {
    defaultLocale = "en_US.UTF-8";
    extraLocales = [
      "en_US.UTF-8/UTF-8"
      "fr_FR.UTF-8/UTF-8"
      "zh_TW.UTF-8/UTF-8"
    ];
    extraLocaleSettings =
      # A list of env variables you might want to set
      #
      # "LC_CTYPE"
      # "LC_NUMERIC"
      # "LC_TIME"
      # "LC_COLLATE"
      # "LC_MONETARY"
      # "LC_MESSAGES"
      # "LC_PAPER"
      # "LC_NAME"
      # "LC_ADDRESS"
      # "LC_TELEPHONE"
      # "LC_MEASUREMENT"
      # "LC_IDENTIFICATION"
      let
        genLocale = locale: lib.flip lib.genAttrs (_: locale);
      in
        genLocale "zh_TW.UTF-8" [
          "LC_TIME"
          "LC_MONETARY"
          "LC_ADDRESS"
        ];
  };

  # Wireless Regulatory Domain, uses ISO / IEC 3166 country code
  #
  # links:
  # https://community.frame.work/t/framework-nixos-linux-users-self-help/31426/77
  # https://wireless.docs.kernel.org/en/latest/en/developers/regulatory.html#the-ieee80211-regdom-module-parameter
  hardware.wirelessRegulatoryDatabase = true;
  boot.extraModprobeConfig = ''
    options cfg80211 ieee80211_regdom="TW"
  '';
}