I do this in one of my Emacs lisp projects, I set the `TZ` environment variable to `UTC` in my test config.
So when the tests run on Travis, it thinks that it lives in the UTC zone, and all time stamps are created accordingly. That way, you don't need to hardcode the time zone in your Nim code, and all time manipulation code will default to the local time zone (set by TZ).. I believe. I haven't tried this with Nim, so just try it out :)
