{...}: {
  # Set your time zone.
  time.timeZone = "Europe/Paris";

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";

  i18n.extraLocaleSettings = {
    LC_ADDRESS = "fr_CH.UTF-8";
    LC_IDENTIFICATION = "fr_CH.UTF-8";
    LC_MEASUREMENT = "fr_CH.UTF-8";
    LC_MONETARY = "fr_CH.UTF-8";
    LC_NAME = "fr_CH.UTF-8";
    LC_NUMERIC = "fr_CH.UTF-8";
    LC_PAPER = "fr_CH.UTF-8";
    LC_TELEPHONE = "fr_CH.UTF-8";
    LC_TIME = "fr_CH.UTF-8";
  };
}