nixpkgs/nixos/modules/config/timezone.nix

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{ config, lib, pkgs, ... }:
with lib;
let
tzdir = "${pkgs.tzdata}/share/zoneinfo";
in
{
options = {
time = {
timeZone = mkOption {
default = "CET";
type = types.str;
example = "America/New_York";
description = "The time zone used when displaying times and dates.";
};
hardwareClockInLocalTime = mkOption {
default = false;
description = "If set, keep the hardware clock in local time instead of UTC.";
};
};
};
config = {
environment.variables.TZDIR = "/etc/zoneinfo";
systemd.globalEnvironment.TZDIR = tzdir;
environment.etc.localtime =
{ source = "${tzdir}/${config.time.timeZone}";
mode = "direct-symlink";
};
environment.etc.zoneinfo.source = "${pkgs.tzdata}/share/zoneinfo";
};
}