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{ config, lib, pkgs, ... }:
with lib;
let
tzdir = "${pkgs.tzdata}/share/zoneinfo";
nospace = str: filter (c: c == " ") (stringToCharacters str) == [];
timezone = types.nullOr (types.addCheck types.str nospace)
// { description = "null or string without spaces"; };
in
{
options = {
time = {
timeZone = mkOption {
default = null;
type = timezone;
example = "America/New_York";
description = ''
The time zone used when displaying times and dates. See <link
xlink:href="https://en.wikipedia.org/wiki/List_of_tz_database_time_zones"/>
for a comprehensive list of possible values for this setting.
If null, the timezone will default to UTC and can be set imperatively
using timedatectl.
'';
};
hardwareClockInLocalTime = mkOption {
default = false;
type = types.bool;
description = "If set, keep the hardware clock in local time instead of UTC.";
};
};
};
config = {
environment.sessionVariables.TZDIR = "/etc/zoneinfo";
# This way services are restarted when tzdata changes.
systemd.globalEnvironment.TZDIR = tzdir;
systemd.services.systemd-timedated.environment = lib.optionalAttrs (config.time.timeZone != null) { NIXOS_STATIC_TIMEZONE = "1"; };
environment.etc = {
zoneinfo.source = tzdir;
} // lib.optionalAttrs (config.time.timeZone != null) {
localtime.source = "/etc/zoneinfo/${config.time.timeZone}";
localtime.mode = "direct-symlink";
};
};
}
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