nixpkgs/modules/system/boot/shutdown.nix

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{ config, pkgs, ... }:
with pkgs.lib;
{
# This unit saves the value of the system clock to the hardware
# clock on shutdown.
boot.systemd.units."save-hwclock.service" =
{ wantedBy = [ "shutdown.target" ];
text =
''
[Unit]
Description=Save Hardware Clock
DefaultDependencies=no
Before=shutdown.target
[Service]
Type=oneshot
ExecStart=${pkgs.utillinux}/sbin/hwclock --systohc ${if config.time.hardwareClockInLocalTime then "--localtime" else "--utc"}
'';
};
}