For a slightly higher-quality conversion, the attribution entries in the map file should have a third field: timezone. IANA zones are acceptable.
This wouldn't change how commit times are stored internally, but the Git tools use it for display in local time. -- <a href="http://www.catb.org/~esr/">Eric S. Raymond</a> My work is funded by the Internet Civil Engineering Institute: https://icei.org Please visit their site and donate: the civilization you save might be your own.