nixpkgs/nixos/modules/config/timezone.nix

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{ config, pkgs, ... }:
with pkgs.lib;
{
options = {
time = {
timeZone = mkOption {
default = "CET";
type = with types; uniq string;
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";
environment.variables.TZ = config.time.timeZone;
environment.etc.localtime.source = "${pkgs.tzdata}/share/zoneinfo/${config.time.timeZone}";
environment.etc.zoneinfo.source = "${pkgs.tzdata}/share/zoneinfo";
};
}