Apparently both IATA and Brazil's own airline industry (ABEAR) are pushing back on the government, citing at least three million passengers on 42 thousand flights will be affected. Also stated by ABEAR's representative (translated via Google Translate): "Short-term changes bring risks to the entire operation of airlines". It's good to see others have realized the risk. I worry about the back and forth though. https://www.panrotas.com.br/aviacao/aeroportos/2018/10/iata-ve-troca-no-hora... https://www.panrotas.com.br/aviacao/empresas/2018/10/abear-se-posiciona-cont... http://www.abear.com.br/imprensa/notas-e-releases/mostrar/posicionamento-abe... -Matt ________________________________ From: tz <tz-bounces@iana.org> on behalf of Paul Eggert <eggert@cs.ucla.edu> Sent: Thursday, October 4, 2018 8:37 AM To: Fábio Gomes Cc: Time Zone Mailing List Subject: Re: [tz] Another change on Brazilian DST time 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@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" <https://codeofmatt.com/2016/04/23/on-the-timing-of-time-zone-changes/> para exemplos.