Gmail munges dates?

[Denton Liu <liu.denton@gmail.com>]

Hi all,

It seems like Gmail is munging the dates on patches sent. Before today,
I've been sending patches out with mutt but I decided to switch to
git-send-email today since I was forwarding a patch that wasn't mine and
I wanted to preserve the date as part of the authorship information.

Unfortunately, it seems like mutt wasn't the culprit, it was Gmail
that's been munging the dates. For example, in this patch[1], the date
shows as

	Date: Thu, 12 Dec 2019 16:44:50 -0800

even though locally, the output of the format-patch shows as

	Date: Mon, 9 Dec 2019 19:25:34 +0100

So two questions related to this:

1. Is this something that we care about or is it okay to have fudged
dates? (I know all of my patches in each patchset only differ by a few
seconds and it seems like no one has noticed or cared so far)

2. Do we want to introduce a --in-body-date option or something to
format-patch which would include an in-body Date:, similar to the
in-body From:? (Also, while we're at it, maybe we could include an
--in-body-from to force that to happen since that's been a feature that
was requested in the past[2])

Thanks,

Denton

[1]: https://lore.kernel.org/git/8691ed2b84f7ee6b7c12d04d57a541bf22660333.1576197846.git.liu.denton@gmail.com/
[2]: https://lore.kernel.org/git/20191010225405.GA19475@sigill.intra.peff.net/