[tz] Another change on Brazilian DST time

Deborah Goldsmith goldsmit at apple.com
Mon Oct 15 15:45:21 UTC 2018

iOS currently has the start of DST in Brazil on November 4, per the latest released IANA data.

If you read the article, you’ll see the problem affects customers of the TIM mobile network, and is affecting Asus phones on that network as well. Customers of other mobile networks are not affected. Also, the article says that the user’s time zone changed from “Sao Paulo” to “Etc/GMT+2”. All this would tend to indicate that one network changed the customers’ time zone via the NITZ protocol.

I expect more details will be forthcoming.

I’m sincerely hoping Brazil releases the final decree on the change to November 14 very soon (or an announcement the decree has been retracted).


> On Oct 15, 2018, at 4:49 AM, Rodrigo Brüning Wessler <madigo at gmail.com> wrote:
> Many IPhone users woke up one hour earlier in Brazil today
> Apparently, the IOS changed the phone time to DST, in last year (2017) the date to start DST in Brazil was october 15 (coincidence, no?).
> Maybe this problem already occurred because the first change in DST rule, that changed the start date to november 4, because of the elections dates on Brazil.
> If this assumption is correct, we had problems even with 10 months to update the DST rules. 
> It's a little sample of what can happen if the DST is changed again with only a few weeks to update all affected devices.
> sources:
> https://tecnoblog.net/263674/iphone-acertar-relogio-alarme-horario-verao-errado/
> https://www.correiobraziliense.com.br/app/noticia/brasil/2018/10/15/interna-brasil,712674/iphone-muda-de-horario-e-usuarios-acordam-uma-hora-mais-cedo.shtml
> Em qua, 10 de out de 2018 às 15:39, Stepan Golosunov <stepan at golosunov.pp.ru> escreveu:
> 11.10.2018 в 00:53:17 +0800 Phake Nick написал(а):
> > In fact railroad in countries like Kazakhstan, Russia, China do follow time
> > of their capital and thus you need to use Moscow time even if you're taking
> > a train at Vladivostok, which it doesn't appears to be convenient.
> That's no longer true for Russia:
> http://eng.rzd.ru/newse/public/en?STRUCTURE_ID=15&layer_id=4839&id=107332
> > 在 2018年10月10日週三 02:44,Paul Eggert <eggert at cs.ucla.edu> 寫道:
> > 
> > > Lester Caine wrote:
> > > > That IATA is now complaining about the very short notice
> > >
> > > If *I* were running an airline, I'd issue tickets with times in UTC only.
> > > That
> > > would solve *that* problem.
> > >
> > > And perhaps that's why I'm not running any airlines....
> > >

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