Fix utcTime change issue.

        One branch assumed milliseconds precision, the other removed it, so
        merge caused journalctl to not be able to parse our date.
yeah, I was trying to avoid using it because of the current `timelocale`/`oldlocale` ugliness. Sort of surprisingly, a week or two ago the verison of time of nixpkgs still needed the `oldlocale` package, though maybe that has been fixed.