I was able to reproduce the problem by setting my system to a timezone, and my `TZ` to a different one. Since it'll default to `UTC`, and to avoid having to pass it around from the system to the client (since we don't really care about the timezone), we simply force the timezone to UTC in the formatting as well, because, again, we don't store timezones or care about them for expenses.
Fixes#88
eabd888df2