[tz] Another change on Brazilian DST time
eggert at cs.ucla.edu
Thu Oct 4 15:37:17 UTC 2018
On 10/4/18 4:49 AM, Fábio Gomes wrote:
> How long does it takes to update tzdata with this new information?
It depends on what you consider an "update". I just now updated the
development version <https://github.com/eggert/tz> with the attached
patch, and you can use that now if you like. I'd like to plan for a new
tzdb release soon after the presidential decree is published (please let
me know when that happens).
> we have a very shourt window to apply this new update.
That's unfortunately true. We have a paragraph about this in
<https://data.iana.org/time-zones/tz-link.html>. Here's how Google
Translate renders it in Portuguese, and perhaps you can improve this
translation and send it to Moreira Franco, the minister of Mines and
Energy, who's supposed to be in charge of DST in Brazil:
Se o seu governo planeja alterar seus limites de fuso horário ou as
regras de horário de verão, informe <tz at iana.org> com bastante
antecedência, pois isso coordenará as atualizações para muitos telefones
celulares, computadores e outros dispositivos em todo o mundo. Com menos
de um ano de antecedência, há uma boa chance de que alguns relógios
baseados em computador operem incorretamente após a alteração, devido a
atrasos na propagação de atualizações de software e dados. Quanto mais
curto for o aviso, mais prováveis serão os problemas do relógio; veja
"Sobre o tempo das mudanças de fuso horário"
-------------- next part --------------
From efda0562d7fc7bc90b6cab76998fab8b4953e056 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Thu, 4 Oct 2018 08:24:15 -0700
Subject: [PROPOSED] Southern Brazil starts DST two weeks later in 2018
* NEWS: Mention this.
* southamerica (Brazil): New rule just for spring 2018.
NEWS | 5 +++++
southamerica | 9 ++++++++-
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/NEWS b/NEWS
index e217a50..395d9a8 100644
@@ -4,6 +4,7 @@ Unreleased, experimental changes
Volgograd moves from +03 to +04 on 2018-10-28.
+ Southern Brazil starts DST 2018-11-18, not 2018-11-04.
Fiji ends DST 2019-01-13, not 2019-01-20.
Most of Chile changes DST dates, effective 2019-04-06.
@@ -12,6 +13,10 @@ Unreleased, experimental changes
Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
(Thanks to Alexander Fetisov and Stepan Golosunov.)
+ Southern Brazil starts DST 2018-11-18 instead of the 2018-11-04
+ previously predicted. (Thanks to Fábio Gomes.) Guess that this
+ is a one-time change.
Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
predicted. (Thanks to Raymond Kumar.) Adjust future predictions
diff --git a/southamerica b/southamerica
index dedfb28..214316e 100644
@@ -927,7 +927,14 @@ Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
# ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
# From Steffen Thorsen (2017-12-20):
-Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 -
+# From Fábio Gomes (2018-10-04):
+# The Brazilian president just announced a new change on this year DST.
+# It was scheduled to start on November 4th and it was changed to November 18th.
+# From Paul Eggert (2018-10-04):
+# This attempts to avoid confusion during the November 4 and 11 national high
+# school exams, which were mis-scheduled. Guess that it's just this year.
+Rule Brazil 2018 only - Nov Sun>=15 0:00 1:00 -
+Rule Brazil 2019 max - Nov Sun>=1 0:00 1:00 -
Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
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