First, your email program really need to understand time zones if you want sorting to work properly.

That said, I haven't seen this, can you please provide a bug mail which shows the problem?

(In reply to comment #1)

> First, your email program really need to understand time zones if you want sorting to work properly.

I guess Thunderbird does.


> That said, I haven't seen this, can you please provide a bug mail which shows the problem?

Good question. Will collect some examples over the time.
(Vaguely I've the idea that it is in the situation where some else (from different time zone?) just commented before me ... but you may forget this until I have some examples).

Created attachment 56896 [details]
mbox with example

Here is an example. The "Date" header is set with the *wrong* timezone, leading my mutt (which understands timezones alright, thank you very much) to sort comment 8 before comments 5,6,7.

Example:

Recieved notification of
  https://bugs.freedesktop.org/show_bug.cgi?id=39026#c12
time stamped 07:28 (in my mail box)

the same applies for the notification mail reg. this issue for the container bug
  https://bugs.freedesktop.org/show_bug.cgi?id=37361

notifications for 
  https://bugs.freedesktop.org/show_bug.cgi?id=39026#c13
and
  https://bugs.freedesktop.org/show_bug.cgi?id=39026#c14

are time stamped 15:49 and 16:17 (in my mail box)

ANother example:

I posted this one
  https://bugs.freedesktop.org/show_bug.cgi?id=37593#c9
on 16:54 CET
and in my Thunderbird it is time stamped 7:54 (as it is marked in BugZilla)

HTH.
pls let me know if you need more data.

*** Bug 50485 has been marked as a duplicate of this bug. ***

@Cor, @all
Where exactly do you see these problems? I very often see that with Bugzilla mails (Bug 50485), where the bug is very obvious. The UTC time stamp I see in the Bug report is definitively wrong. 
Concerning mailing lists I am not sure (a quick sample I did was ok), but I think I remember that I also saw that problem in the mailing lists.

No response, so I limit Bug to Bugzilla problem.

Today I submitted "Bug 50755 - Version Picker Changes test bug" at approximately 04:00 UTC. 
 - Submission in bug correctly shown "2012-06-06 04:06:57 UTC"
  -- In my Mail client I did not receive a mail, may be because contents or
     report was empty?
 - Test modification (add myself to cc) shown correctly in Mail Client
  (Local time 06:22 = 04:22 UTC) but in Bug History I 
   read "2012-06-05 21:22:00 UTC"                                      ?!?
 - Dummy entry shown correctly in Comment heading "2012-06-06 05:50:09 UTC"
   But in My Mail Client "00:50 (Local time)                           ?!?

Today 06:00 UTC I submitted within few minutes
"Bug 51744 - TDF Site down"
  shown submission time 2012-07-04 23:04:44 UTC 
"Bug 51743 - Wiki: Seems to be down"
  shown submission time 2012-07-05 06:00:23 UTC 

Crazy!

I have the impression (not tested many times) that:
when I submit a bug, time is correct,
then the screen changes, so that there is a message on top (changes submitted to) and a link to the issue a bit lower and then the issue itself.
Now if you fill in a comment in that situation, that seems a good recipe for hitting this issue.
Well, that is what I thought. But testing with 48869 doesn't show the bug ... Hmm

test in this issue ..

(In reply to comment #10)
> I have the impression (not tested many times) that:
> [...]
> Hmm

No, that impression proved wrong. It is ad random, as far as I can notice ...

> [...] It is ad random, as far as I can notice ...

That's my impression, too!

*** Bug 52237 has been marked as a duplicate of this bug. ***

*** Bug 52056 has been marked as a duplicate of this bug. ***

Created attachment 64830 [details]
Screenshot

Attached pdf shows view of a bug I reported 2012-07-29 app 05:30 UTC; Report Time in Bugzilla;
"Reported: 2012-07-29 00:38 UTC" is wrong, also Comment 1 time (what indeed has been reported 2 minute after report)

(In reply to comment #15)
> *** Bug 52056 has been marked as a duplicate of this bug. ***

I should reopen as this bug is not about e-mail timestamps, but initial bug creation date saved in the bugs database. For instance this bug report wasn't created at 2012-07-14 00:34:49 CEST as we can see at https://bugs.freedesktop.org/show_activity.cgi?id=52056. Such time skip on a bugzilla server is a major problem.

Please see if this problem has now gone away.  The bugzilla server has moved to UTC so there should hopefully not be any more disreprancies.

I haven't see any misdates recently.

Seems to be ok now, closig this for now