Johannes Schindelin <johannes.schinde...@gmx.de> writes:
> Date: Fri, 04 Oct 2019 08:09:25 -0700 (PDT)
> [...]
> X-Google-Original-Date: Fri, 04 Oct 2019 15:09:10 GMT
> [...]
>
> I am fairly certain that the latter is the actual `Date:` line sent to
> GMail, and GMail just decides that it will not respect it.
If the submitting program said "Fri, 04 Oct 2019 15:09:10 +0000
(GMT)" instead of "Fri, 04 Oct 2019 15:09:10 GMT", that would match
the format the MTA produced itself, I guess. I am kind-of surprised
if the problem is the use of the obs-zone format (RFC 2822 page 31),
but anything is possible with GMail X-<.
How does send-email write that date header? Matching that would be
probably the most appropriate, if possible, given that GGG was
written for send-email refugees, I guess ;-)
Here is what its format_2822_time sub does, so +0000 without any
textual zone name, it is.
return sprintf("%s, %2d %s %d %02d:%02d:%02d %s%02d%02d",
qw(Sun Mon Tue Wed Thu Fri Sat)[$localtm[6]],
$localtm[3],
qw(Jan Feb Mar Apr May Jun
Jul Aug Sep Oct Nov Dec)[$localtm[4]],
$localtm[5]+1900,
$localtm[2],
$localtm[1],
$localtm[0],
($offset >= 0) ? '+' : '-',
abs($offhour),
$offmin,
);
