Yes, I'm having the same problem, same apparent cause.

Here's my workaround. Whenever the GIT_AUTHOR_DATE seems stuck, I clear it 
by hand:

  C-u M-x setenv GIT_AUTHOR_DATE

Cheers,
Tom

On Saturday, April 14, 2012 5:40:48 PM UTC-4, Nathan Yergler wrote:
>
> Good afternoon,
>
> I've been having a problem intermittently over the past month or so
> that I finally took the time to track down yesterday. The symptom is
> that I'd commit something to the git repository at work using magit,
> and when I looked at the commit log, the date was in the past. This
> was first pointed out to me by a co-worker who asked if I'd managed to
> invent a time machine: fixing a bug we discovered yesterday a week ago
> is a pretty neat party trick. Once I confirmed that I truly was not
> Dr. Sam Beckett [1], I decided to track down the problem.
>
> Yesterday I noticed that a commit made through Magit had the incorrect
> date, while a commit made from the command line (outside of Emacs) had
> the correct date. When I started looking at magit.el, I found the
> setting of GIT_AUTHOR_DATE in magit-log-edit-setup-author-env. My
> hypothesis, which I was able to confirm, is that when you rewrite a
> commit, GIT_AUTHOR_DATE is set. However, despite the fact
> process-environment is set up as a local variable, the setting
> persists -- running (get-env "GIT_AUTHOR_DATE") in *scratch* after
> rewriting a commit returns the rewritten commit's date. Future commits
> will all have the same date as the last rewritten commit.
>
> I started to go down the path of clearing the GIT_AUTHOR_* variables
> from the process-environment when no author is present, but that would
> preclude setting them outside of Emacs. I wonder if instead magit
> should specify --author and/or --date to the command line if the
> author information is present.
>
> Does that seem reasonable? Has anyone else run into this issue?
>
> Thanks,
>
> NRY
>
> [1] http://en.wikipedia.org/wiki/Quantum_Leap
>
>

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