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* Bug in tzdata 2022g
@ 2023-05-06 08:35 Nacho Caballero <nachocab@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Nacho Caballero @ 2023-05-06 08:35 UTC (permalink / raw)
To: pgsql-bugs@lists.postgresql.org; tgl@sss.pgh.pa.us
There appears to be a bug in the latest postgres release, which uses tzdata
2022g to reflect the recent DST change in Mexico.
When I convert a UTC timestamp to Mexico City time in 13.10 (Debian
13.10-1.pgdg110+1), I get a one hour difference, which is wrong:
select timezone('America/Mexico_City', '2023-05-06T08:00+00:00'),
timezone('America/Bogota', '2023-05-06T08:00+00:00');
timezone | timezone
---------------------+---------------------
2023-05-06 02:00:00 | 2023-05-06 03:00:00
However, when I run it in PostgreSQL 12.10 (Ubuntu 12.10-1.pgdg20.04+1), I
get the right answer (no time difference):
timezone | timezone
---------------------+---------------------
2023-05-06 03:00:00 | 2023-05-06 03:00:00
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Bug in tzdata 2022g
@ 2023-05-06 14:50 Tom Lane <tgl@sss.pgh.pa.us>
parent: Nacho Caballero <nachocab@gmail.com>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2023-05-06 14:50 UTC (permalink / raw)
To: Nacho Caballero <nachocab@gmail.com>; +Cc: pgsql-bugs@lists.postgresql.org
Nacho Caballero <nachocab@gmail.com> writes:
> There appears to be a bug in the latest postgres release, which uses tzdata
> 2022g to reflect the recent DST change in Mexico.
I see no bug here. America/Mexico_City is reported as being -06
all year round, which agrees with what the tzdb commentary says:
# From Paul Eggert (2022-10-28):
# The new Mexican law was published today:
# https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022
# This abolishes DST except where US DST rules are observed,
# and in addition changes all of Chihuahua to -06 with no DST.
Meanwhile, Bogota has been -05 year-round since the nineties.
If you disagree with either of these conclusions, you had better
provide some solid evidence to back it up; and the place to be
complaining to is the tzdata maintainers, not us.
> However, when I run it in PostgreSQL 12.10 (Ubuntu 12.10-1.pgdg20.04+1), I
> get the right answer (no time difference):
Apparently, your PG 12.10 installation is using some pre-2022f
version of tzdata. Mexico didn't abolish DST until late last year.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Bug in tzdata 2022g
@ 2023-05-06 17:10 Nacho Caballero <nachocab@gmail.com>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: Nacho Caballero @ 2023-05-06 17:10 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-bugs@lists.postgresql.org
Thanks to the reply, Tom. My bad, I was being misled by savvytime.com,
startpage.com and search.brave.com.
Other providers like timeanddate.com, google.com and
https://www.cenam.mx/hora_oficial/default2.aspx have the correct time.
On Sat, May 6, 2023 at 4:50 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Nacho Caballero <nachocab@gmail.com> writes:
> > There appears to be a bug in the latest postgres release, which uses
> tzdata
> > 2022g to reflect the recent DST change in Mexico.
>
> I see no bug here. America/Mexico_City is reported as being -06
> all year round, which agrees with what the tzdb commentary says:
>
> # From Paul Eggert (2022-10-28):
> # The new Mexican law was published today:
> # https://www.dof.gob.mx/nota_detalle.php?codigo=5670045&fecha=28/10/2022
> # This abolishes DST except where US DST rules are observed,
> # and in addition changes all of Chihuahua to -06 with no DST.
>
> Meanwhile, Bogota has been -05 year-round since the nineties.
>
> If you disagree with either of these conclusions, you had better
> provide some solid evidence to back it up; and the place to be
> complaining to is the tzdata maintainers, not us.
>
> > However, when I run it in PostgreSQL 12.10 (Ubuntu 12.10-1.pgdg20.04+1),
> I
> > get the right answer (no time difference):
>
> Apparently, your PG 12.10 installation is using some pre-2022f
> version of tzdata. Mexico didn't abolish DST until late last year.
>
> regards, tom lane
>
^ permalink raw reply [nested|flat] 3+ messages in thread
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2023-05-06 08:35 Bug in tzdata 2022g Nacho Caballero <nachocab@gmail.com>
2023-05-06 14:50 ` Tom Lane <tgl@sss.pgh.pa.us>
2023-05-06 17:10 ` Nacho Caballero <nachocab@gmail.com>
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