groff will add a timestamps to documentation it produces.

Known affected packages

Detection

Example debbindiff output

Solution

Colin Watson said he would look into it. Tracked as 762854. Discussions with upstream

Most of the problems should be fixed as of groff 1.22.3-3, but some output devices (notably HTML) produce different output depending on the locale's character encoding, and this is difficult to fix. Colin recommends running groff in LC_ALL=C.UTF-8 TZ=UTC at least for the moment.