Am 23.06.2017 um 18:21 schrieb alvinpenner:
one final comment and then I promise we will never speak of this again. It is
possible that this is a Windows-specific issue. On Windows the format '%H
%ci' is not acceptable while the format "%H %ci" works correctly, [...]

You might try to ask / file an issue at https://github.com/git-for-windows/git/issues (maybe they know the answer, maybe it's an actual bug).

That being said there are alternatives to using git from cmd.exe that will make your life easier:

Regards,
Eduard

[1] https://www.sourcetreeapp.com/