GNU bug report logs - #35746
Evolution calendar gets the timezone wrong

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: bug-guix <at> gnu.org
Subject: Evolution calendar gets the timezone wrong
Date: Wed, 15 May 2019 23:16:37 +1000

[Message part 1 (text/plain, inline)]

Hi Folks,

My Guix System is configured with (timezone "Australia/Melbourne") which
is reflected by the `date` command as well as the Gnome clock.

$ date
Wed May 15 23:03:34 AEST 2019

In Evolution though, all my calendar events show up in UTC time, so I
have appointments showing up at eg. 1am.

When I go to Edit, Preferences, Calendar and Task, General, under
timezone it says:

[x] Use system time (UTC)

The timezone can be overridden manually by unchecking the box and selecting at
timezone, which fixes the problem but shouldn't be necessary.

For what it's worth, the Gnome 3 notifications that show when you click on the
Gnome clock are in the correct timezone.

Regards,
Ben

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Message #8 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 16 May 2019 13:13:46 +0200

Hi Ben,

Ben Sturmfels <ben <at> sturm.com.au> skribis:

> In Evolution though, all my calendar events show up in UTC time, so I
> have appointments showing up at eg. 1am.
>
> When I go to Edit, Preferences, Calendar and Task, General, under
> timezone it says:
>
> [x] Use system time (UTC)

Could you figure out how Evolution determines what the current time zone
is?

Guix provides /etc/localtime, which is what libc functions use, but I’m
guessing Evolution uses a custom framework, possibly involving a
hard-to-believe network of D-Bus services.

Thanks,
Ludo’.

Message #11 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 16 May 2019 22:57:06 +1000

[Message part 1 (text/plain, inline)]

Hi Ludo,

On Thu, 16 May 2019, Ludovic Courtès wrote:
> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>
>> In Evolution though, all my calendar events show up in UTC time, so I
>> have appointments showing up at eg. 1am.
>>
>> When I go to Edit, Preferences, Calendar and Task, General, under
>> timezone it says:
>>
>> [x] Use system time (UTC)
>
> Could you figure out how Evolution determines what the current time zone
> is?
>
> Guix provides /etc/localtime, which is what libc functions use, but I’m
> guessing Evolution uses a custom framework, possibly involving a
> hard-to-believe network of D-Bus services.

One clue is that when I run `evolution` in a terminal it logs the
following error:

(evolution:4359): libecal-CRITICAL **: 17:22:46.073: e_cal_util_get_system_timezone: assertion 'location != NULL' failed

So my C troubleshooting skills are very rusty, but this is a learning
opportunity!

`strace evolution 2>&1 | grep /etc/localtime` indicates /etc/localtime
is being opened at least.

I've downloaded the source with `guix build --source
evolution-data-server`, extracted and found the the function
"e_cal_util_get_system_timezone()" at src/calendar/libecal/e-cal-util.c:1507
which calls down to "system_timezone_find()" in e-cal-system-timezone.c:522
where it looks up the timezone and compares it to a list of valid zones.

So I run `gdb evolution`, but don't seem to have the debugging symbols.
How does one get/build the debugging symbols? Can `guix build` help with
this?

Possibly completely unrelated, but noting that both icecat and chromium
do this - which is wrong:

> new Date().getTimezoneOffset()
0

Where node does this - which is correct:

> new Date().getTimezoneOffset()
-600

Cheers,
Ben

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Message #14 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 16 May 2019 23:18:53 +1000

[Message part 1 (text/plain, inline)]

On Thu, 16 May 2019, Ben Sturmfels wrote:

> So I run `gdb evolution`, but don't seem to have the debugging symbols.
> How does one get/build the debugging symbols? Can `guix build` help with
> this?

I mean, I know from long ago university projects that I need "-g -O0".
Does guix have any secret weapons to help with this?

Ben

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Message #17 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 16 May 2019 23:23:32 +1000

[Message part 1 (text/plain, inline)]

On Thu, 16 May 2019, Ben Sturmfels wrote:

> Possibly completely unrelated, but noting that both icecat and chromium
> do this - which is wrong:
>
>> new Date().getTimezoneOffset()
> 0
>
> Where node does this - which is correct:
>
>> new Date().getTimezoneOffset()
> -600

I also tested epiphany which shows the correct offset of "-600".

Ben

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Message #20 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Danny Milosavljevic <dannym <at> scratchpost.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: Ludovic Courtès <ludo <at> gnu.org>, 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 16 May 2019 19:18:37 +0200

[Message part 1 (text/plain, inline)]

You'd have to add a debug output to the package in question

 (outputs '("out" "debug"))

and possibly pass --enable-debug to configure.

Unfortunately, for space reasons, that's not the default in Guix.

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Message #23 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: 35746 <at> debbugs.gnu.org
Subject: IceCat/Chromium timezone is wrong
Date: Fri, 17 May 2019 11:02:16 +0200

Hi Ben,

Ben Sturmfels <ben <at> sturm.com.au> skribis:

> Possibly completely unrelated, but noting that both icecat and chromium
> do this - which is wrong:
>
>> new Date().getTimezoneOffset()
> 0
>
> Where node does this - which is correct:
>
>> new Date().getTimezoneOffset()
> -600

I noticed it in IceCat and thought it might be a privacy feature.
But maybe it’s a genuine bug?

Ludo’.

Message #26 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Timothy Sample <samplet <at> ngyro.com>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Ben Sturmfels <ben <at> sturm.com.au>, 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Sat, 18 May 2019 13:21:46 -0400

Hello,

Ludovic Courtès <ludo <at> gnu.org> writes:

> Hi Ben,
>
> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>
>> In Evolution though, all my calendar events show up in UTC time, so I
>> have appointments showing up at eg. 1am.
>>
>> When I go to Edit, Preferences, Calendar and Task, General, under
>> timezone it says:
>>
>> [x] Use system time (UTC)
>
> Could you figure out how Evolution determines what the current time zone
> is?
>
> Guix provides /etc/localtime, which is what libc functions use, but I’m
> guessing Evolution uses a custom framework, possibly involving a
> hard-to-believe network of D-Bus services.

I just looked through the source code, and learned that it really,
really wants “/etc/localtime” to be a symlink, because it wants to
resolve which timezone alias the user is using, not just the data.  If
it is not a symlink, it runs through a bunch of system specific checks
(looking up configuration files, etc.) and then tries to compare inodes
and finally file contents.  I get why it wants the name and not just the
data, but I’m not sure why it tries to figure out the absolute canonical
source file for the timezone data instead of just taking the data from
“/etc/localtime”.

It’s easy to patch “evolution-data-server”, but maybe we could do
better?  It seems the “right” way to do what they are doing is to check
the “TZ” environment variable.  However, we don’t set that anymore
because it causes problems with setuid programs
(cf. <https://bugs.gnu.org/29212>).  We have a comment that says that
“TZ” is unnecessary, but it actually has a bit more information than
just having data in “/etc/localtime”, since it could be the name of a
timezone alias.  A small improvement might be to make “/etc/localtime” a
symlink, but that might run into the same issues described the bug.

I’ve noticed a few other problems with timezones in the GNOME ecosystem,
which is why I was curious about this.  Perhaps they all have a common
root cause.

I’m happy to patch this as stop-gap measure, but is there some way we
could “do the right thing” here?


-- Tim

Message #29 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Sat, 18 May 2019 19:51:39 +0200

Hi Ben,

Ben Sturmfels <ben <at> sturm.com.au> skribis:

> I've downloaded the source with `guix build --source
> evolution-data-server`, extracted and found the the function
> "e_cal_util_get_system_timezone()" at src/calendar/libecal/e-cal-util.c:1507
> which calls down to "system_timezone_find()" in e-cal-system-timezone.c:522
> where it looks up the timezone and compares it to a list of valid zones.

Looking more closely, ‘system_timezone_find’ first tries to see if
/etc/localtime is a symlink and if yes reads its target (but it’s never
a symlink, AFAIK), and later on tries to compare /etc/localtime to files
found under ‘SYSTEM_ZONEINFODIR’.

Problem is:

  #define SYSTEM_ZONEINFODIR "/usr/share/zoneinfo"

So probably, if you substitute “/usr/” with the prefix of the ‘tzdata’
package, it’ll work much better.  :-)

Let me know how it goes!

Ludo’.

Message #32 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Timothy Sample <samplet <at> ngyro.com>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Ben Sturmfels <ben <at> sturm.com.au>, 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Sat, 18 May 2019 14:43:58 -0400

Hi again,

Timothy Sample <samplet <at> ngyro.com> writes:

> Hello,
>
> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> Hi Ben,
>>
>> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>>
>>> In Evolution though, all my calendar events show up in UTC time, so I
>>> have appointments showing up at eg. 1am.
>>>
>>> When I go to Edit, Preferences, Calendar and Task, General, under
>>> timezone it says:
>>>
>>> [x] Use system time (UTC)
>>
>> Could you figure out how Evolution determines what the current time zone
>> is?
>>
>> Guix provides /etc/localtime, which is what libc functions use, but I’m
>> guessing Evolution uses a custom framework, possibly involving a
>> hard-to-believe network of D-Bus services.
>
> I just looked through the source code, and learned that it really,
> really wants “/etc/localtime” to be a symlink, because it wants to
> resolve which timezone alias the user is using, not just the data.  If
> it is not a symlink, it runs through a bunch of system specific checks
> (looking up configuration files, etc.) and then tries to compare inodes
> and finally file contents.  I get why it wants the name and not just the
> data, but I’m not sure why it tries to figure out the absolute canonical
> source file for the timezone data instead of just taking the data from
> “/etc/localtime”.
>
> It’s easy to patch “evolution-data-server”, but maybe we could do
> better?  It seems the “right” way to do what they are doing is to check
> the “TZ” environment variable.  However, we don’t set that anymore
> because it causes problems with setuid programs
> (cf. <https://bugs.gnu.org/29212>).  We have a comment that says that
> “TZ” is unnecessary, but it actually has a bit more information than
> just having data in “/etc/localtime”, since it could be the name of a
> timezone alias.  A small improvement might be to make “/etc/localtime” a
> symlink, but that might run into the same issues described the bug.

Okay, so it turns I don’t know what “TZ” is!  :p

It does not contain the timezone name, like “America/New_York”, but
rather its designation, like “EST”.  What “evolution-data-server” wants
is the name.

> I’ve noticed a few other problems with timezones in the GNOME ecosystem,
> which is why I was curious about this.  Perhaps they all have a common
> root cause.
>
> I’m happy to patch this as stop-gap measure, but is there some way we
> could “do the right thing” here?

I guess there is no standard way to get the name of the system timezone,
and that is why “evolution-data-server” goes to such great lengths to
figure it out.

Sorry for the noise!


-- Tim

Message #35 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: sirmacik <sirmacik <at> wioo.waw.pl>
To: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Sun, 19 May 2019 23:17:29 +0200

Timothy Sample dixit (2019-05-18, 14:43):

> Hi again,
>
> Timothy Sample <samplet <at> ngyro.com> writes:
>
> > Hello,
> >
> > Ludovic Courtès <ludo <at> gnu.org> writes:
> >
> >> Hi Ben,
> >>
> >> Ben Sturmfels <ben <at> sturm.com.au> skribis:
> >>
> >>> In Evolution though, all my calendar events show up in UTC time, so I
> >>> have appointments showing up at eg. 1am.
> >>>
> >>> When I go to Edit, Preferences, Calendar and Task, General, under
> >>> timezone it says:
> >>>
> >>> [x] Use system time (UTC)
> >>
> >> Could you figure out how Evolution determines what the current time zone
> >> is?
> >>
> >> Guix provides /etc/localtime, which is what libc functions use, but I’m
> >> guessing Evolution uses a custom framework, possibly involving a
> >> hard-to-believe network of D-Bus services.
> >
> > I just looked through the source code, and learned that it really,
> > really wants “/etc/localtime” to be a symlink, because it wants to
> > resolve which timezone alias the user is using, not just the data.  If
> > it is not a symlink, it runs through a bunch of system specific checks
> > (looking up configuration files, etc.) and then tries to compare inodes
> > and finally file contents.  I get why it wants the name and not just the
> > data, but I’m not sure why it tries to figure out the absolute canonical
> > source file for the timezone data instead of just taking the data from
> > “/etc/localtime”.
> >
> > It’s easy to patch “evolution-data-server”, but maybe we could do
> > better?  It seems the “right” way to do what they are doing is to check
> > the “TZ” environment variable.  However, we don’t set that anymore
> > because it causes problems with setuid programs
> > (cf. <https://bugs.gnu.org/29212>).  We have a comment that says that
> > “TZ” is unnecessary, but it actually has a bit more information than
> > just having data in “/etc/localtime”, since it could be the name of a
> > timezone alias.  A small improvement might be to make “/etc/localtime” a
> > symlink, but that might run into the same issues described the bug.
>
> Okay, so it turns I don’t know what “TZ” is!  :p
>
> It does not contain the timezone name, like “America/New_York”, but
> rather its designation, like “EST”.  What “evolution-data-server” wants
> is the name.
>
> > I’ve noticed a few other problems with timezones in the GNOME ecosystem,
> > which is why I was curious about this.  Perhaps they all have a common
> > root cause.
> >
> > I’m happy to patch this as stop-gap measure, but is there some way we
> > could “do the right thing” here?
>
> I guess there is no standard way to get the name of the system timezone,
> and that is why “evolution-data-server” goes to such great lengths to
> figure it out.
>
> Sorry for the noise!
>
>
> -- Tim
>

Hey Guix,

This problem seems to be also present also for other programs such as
GNU IceCat which reads UTC timezone every time, despite Europe/Warsaw
being set in my config.scm.


--
sirmacik
PGP: 0xE0DC81D523891771

Message #38 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 12 Sep 2019 12:00:49 +0200

Hello Ben,

Ludovic Courtès <ludo <at> gnu.org> skribis:

> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>
>> I've downloaded the source with `guix build --source
>> evolution-data-server`, extracted and found the the function
>> "e_cal_util_get_system_timezone()" at src/calendar/libecal/e-cal-util.c:1507
>> which calls down to "system_timezone_find()" in e-cal-system-timezone.c:522
>> where it looks up the timezone and compares it to a list of valid zones.
>
> Looking more closely, ‘system_timezone_find’ first tries to see if
> /etc/localtime is a symlink and if yes reads its target (but it’s never
> a symlink, AFAIK), and later on tries to compare /etc/localtime to files
> found under ‘SYSTEM_ZONEINFODIR’.
>
> Problem is:
>
>   #define SYSTEM_ZONEINFODIR "/usr/share/zoneinfo"
>
> So probably, if you substitute “/usr/” with the prefix of the ‘tzdata’
> package, it’ll work much better.  :-)

Did you have a chance to look into it?

Thanks,
Ludo’.

Message #41 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: sirmacik <sirmacik <at> wioo.waw.pl>
Cc: Timothy Sample <samplet <at> ngyro.com>, 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 12 Sep 2019 12:05:27 +0200

Hello,

sirmacik <sirmacik <at> wioo.waw.pl> skribis:

> This problem seems to be also present also for other programs such as
> GNU IceCat which reads UTC timezone every time, despite Europe/Warsaw
> being set in my config.scm.

I can confirm this (it’s not clear that it relates to the
evolution-data-server issue.)

I vaguely remember that we once had an explanation to the IceCat
timezone issue but I can no longer find it…  Does it ring a bell to
anyone reading this?

Thanks,
Ludo’.

Message #44 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 12 Sep 2019 23:45:07 +1000

[Message part 1 (text/plain, inline)]

On Thu, 12 Sep 2019, Ludovic Courtès wrote:

> Ludovic Courtès <ludo <at> gnu.org> skribis:
>
>> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>>
>>> I've downloaded the source with `guix build --source
>>> evolution-data-server`, extracted and found the the function
>>> "e_cal_util_get_system_timezone()" at src/calendar/libecal/e-cal-util.c:1507
>>> which calls down to "system_timezone_find()" in e-cal-system-timezone.c:522
>>> where it looks up the timezone and compares it to a list of valid zones.
>>
>> Looking more closely, ‘system_timezone_find’ first tries to see if
>> /etc/localtime is a symlink and if yes reads its target (but it’s never
>> a symlink, AFAIK), and later on tries to compare /etc/localtime to files
>> found under ‘SYSTEM_ZONEINFODIR’.
>>
>> Problem is:
>>
>>   #define SYSTEM_ZONEINFODIR "/usr/share/zoneinfo"
>>
>> So probably, if you substitute “/usr/” with the prefix of the ‘tzdata’
>> package, it’ll work much better.  :-)
>
> Did you have a chance to look into it?

Sorry Ludo, no, not yet. It's still on my list to take a look at some
time though.

Regards,
Ben

[signature.asc (application/pgp-signature, inline)]

Message #49 received at 35746-done <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: Timothy Sample <samplet <at> ngyro.com>, sirmacik <sirmacik <at> wioo.waw.pl>,
 35746-done <at> debbugs.gnu.org
Subject: Re: bug#35746: Evolution calendar gets the timezone wrong
Date: Thu, 06 Feb 2020 22:27:02 +1100

[Message part 1 (text/plain, inline)]

Marius B. advised that the Evolution timezone issue was addressed in
2a80d9e55299214a3f0b4f585767b4c81c9d5c7d. I hadn't noticed, but can
confirm that my times are now showing up perfectly in Evolution and
Gnome Calendar, yay thanks! Epiphany is also showing the correct
timezone now for me with `new Date().getTimezoneOffset()`.

On Thu, 12 Sep 2019, Ludovic Courtès wrote:
> sirmacik <sirmacik <at> wioo.waw.pl> skribis:
>
>> This problem seems to be also present also for other programs such as
>> GNU IceCat which reads UTC timezone every time, despite Europe/Warsaw
>> being set in my config.scm.
>
> I can confirm this (it’s not clear that it relates to the
> evolution-data-server issue.)
>
> I vaguely remember that we once had an explanation to the IceCat
> timezone issue but I can no longer find it…  Does it ring a bell to
> anyone reading this?

IceCat and Chromium are still showing UTC for me, so that issue is
clearly not directly related to the now fixed Evolution issue. Will
close this bug report since it's about Evolution.

Regards,
Ben

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Message #60 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: IceCat/Chromium timezone is wrong
Date: Wed, 22 Apr 2020 23:43:58 +1000

On Fri, 17 May 2019, Ludovic Courtès wrote:

> Hi Ben,
>
> Ben Sturmfels <ben <at> sturm.com.au> skribis:
>
>> Possibly completely unrelated, but noting that both icecat and chromium
>> do this - which is wrong:
>>
>>> new Date().getTimezoneOffset()
>> 0
>>
>> Where node does this - which is correct:
>>
>>> new Date().getTimezoneOffset()
>> -600
>
> I noticed it in IceCat and thought it might be a privacy feature.
> But maybe it’s a genuine bug?
>
> Ludo’.

This does appear to be a privacy feature. To report the correct timezone offset, go to  "about:config" and disable "privacy.resistFingerprinting" then restart IceCat.

Note that toggling "privacy.resistFingerprinting" immediately changed the result of `new Date().toString()` on all tabs, but `new Date().getTimezoneOffset()` was changed
only on the about:config tab. After a restart all tabs showed the correct offset.

See this IceCat bug report discussion:
https://lists.gnu.org/archive/html/bug-gnuzilla/2019-06/msg00010.html

Regards,
Ben

Message #63 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels <ben <at> sturm.com.au>
To: Ludovic Courtès <ludo <at> gnu.org>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: IceCat/Chromium timezone is wrong
Date: Wed, 22 Apr 2020 23:02:04 +1000

On Fri, May 17, 2019 at 11:02, Ludovic Courtès <ludo <at> gnu.org> wrote:
> Hi Ben,
> 
> Ben Sturmfels <ben <at> sturm.com.au> skribis:
> 
>>  Possibly completely unrelated, but noting that both icecat and 
>> chromium
>>  do this - which is wrong:
>> 
>>>  new Date().getTimezoneOffset()
>>  0
>> 
>>  Where node does this - which is correct:
>> 
>>>  new Date().getTimezoneOffset()
>>  -600
> 
> I noticed it in IceCat and thought it might be a privacy feature.
> But maybe it’s a genuine bug?
> 
> Ludo’.

This does appear to be a privacy feature. To report the correct 
timezone offset, go to  "about:config" and disable 
"privacy.resistFingerprinting" then restart IceCat.

Note that toggling "privacy.resistFingerprinting" immediately changed 
the result of `new Date().toString()` on all tabs, but `new 
Date().getTimezoneOffset()` was changed
only on the about:config tab. After a restart all tabs showed the 
correct offset.

See this IceCat bug report discussion:
https://lists.gnu.org/archive/html/bug-gnuzilla/2019-06/msg00010.html

Regards,
Ben

Message #66 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: Ben Sturmfels <ben <at> sturm.com.au>
Cc: 35746 <at> debbugs.gnu.org
Subject: Re: bug#35746: IceCat/Chromium timezone is wrong
Date: Wed, 22 Apr 2020 17:13:03 +0200

Hi Ben,

Ben Sturmfels <ben <at> sturm.com.au> skribis:

> This does appear to be a privacy feature. To report the correct timezone offset, go to  "about:config" and disable "privacy.resistFingerprinting" then restart IceCat.

Indeed.  It would be nice if there was a setting specifically for the
timezone rather than the catch-all ‘resistFingerprinting’.

Ludo’.

Message #69 received at 35746 <at> debbugs.gnu.org (full text, mbox):

From: Ben Sturmfels via web <issues.guix.gnu.org <at> elephly.net>
To: 35746 <at> debbugs.gnu.org
Date: Tue,  5 May 2020 07:01:49 +0200

This does appear to be a privacy feature in IceCat. To report the correct timezone offset, go to about:config" and disable "privacy.resistFingerprinting" then restart IceCat.

Note that toggling "privacy.resistFingerprinting" immediately changed the result of `new ate().toString()` on all tabs, but `new Date().getTimezoneOffset()` was changed only on the about:config tab. After a restart all tabs showed the correct offset.

See this IceCat bug report discussion:
https://lists.gnu.org/archive/html/bug-gnuzilla/2019-06/msg00010.html

Regards,
Ben

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