Re: BUG #16123: DST not respected for America/Sao_Paulo in`timestamp` function

Thomas Munro <thomas.munro@gmail.com> writes:
> On Mon, Nov 18, 2019 at 6:38 PM PG Bug reporting form
> <noreply@postgresql.org> wrote:
>> From Nov 3, America/Sao_Paulo should be offset only 2 hours from UTC due to
>> DTS. I would expect the timestamp to be December 1st midnight.

> I was going to reply with some details about how to find out whether
> you're using timezone data files from PostgreSQL or macOS, and how to
> make sure they're up-to-date in both cases, but now I see that my
> computer (which has up-to-date tzdata) agrees with yours, and
> Wikipedia claims that DST was cancelled this year by presidential
> decree.  Why do you think it's wrong?

Indeed, the IANA timezone folks changed their entry in tzdata 2019b,
on the strength of this:

https://mm.icann.org/pipermail/tz/2019-April/027848.html

and other nearby threads in that list archive.  2019b was released
2019-07-02, so any machine with reasonably up-to-date data should
know about this.  In the case of Postgres, we absorbed that change
in the August minor releases.

                        regards, tom lane