Git to svn: Adding commit date to log messages

How should I do to have the author (or committer) name/date added to the log message when "dcommitting" to svn?

For example, if the log message in Git is:
  This is a nice modif

I'd like to have the message in svn be something like:
  This is a nice modif
  -----
  Author: John Doo <John.Doo@company.com>  2010-06-10 12:38:22
  Committer: Nice Guy <nguy@acme.org>  2010-06-10 14:05:42

Any simple way? Hook needed? Other suggestion?

Thank you in advance.

Yours faithfully,