D369: util: add `hgdatetopython` to convert hg-style dates to datetimes

[lothiraldan (Boris Feld)]

lothiraldan added a comment.


  Forget about my comment on the commit message, I was fooled by phabricator

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D369

To: phillco, #hg-reviewers
Cc: lothiraldan, mercurial-devel