Trying to use AUTHOR_DATE

I'm using cogito-0.8 (036bb73c6dd1871101ca19557298684ab9832f81) and trying
to set AUTHOR_DATE based on the "Date:" from the patch e-mail.  But, it
appears that commit-tree is munging this based on my timezone.

Here's what I set in the environment before invoking cg-commit:

  AUTHOR_DATE="29 Apr 2005 02:02:00 -0700"

and here's what cg-log reports on the "author" line:

  Fri, 29 Apr 2005 10:02:00 -0700

My /etc/localtime is set for "US/Pacific" ... which is where the 8 hours
comes from (I think).  If I set "TZ=GMT0BST" as well in the environment of
cg-commit to override /etc/localtime, then the author time comes out ok,
but then the "committer" time gets messed up.

-Tony