nixpkgs/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.";
};
};
config = {
environment.shellInit =
''
export TZ=${config.time.timeZone}
export TZDIR=${pkgs.glibc}/share/zoneinfo
'';
environment.etc = singleton
{ source = "${pkgs.glibc}/share/zoneinfo/${config.time.timeZone}";
target = "localtime";
};
};
}