[tz] Brazil moves DST start to November

[Paul Eggert]

On 12/18/2017 02:22 AM, Steffen Thorsen wrote:
> According to many media sources, next year's DST start in Brazil will 
> move to the first Sunday of November, and it will stay like that for 
> the years after. 
Thanks very much for the heads-up. I installed the attached proposed 
patch into tzdb's development version.

In September, RTTNews reported that Operador Nacional do Sistema 
Elétrico (ONS) had done a preliminary study saying that the effect of 
DST on Brazil's energy usage was trivial and decreasing; see 
<http://markets.businessinsider.com/news/interestrates/BRAZIL-Government-Looks-Into-Giving-Up-On-Daylight-Saving-Time-1002405655>. 
Although I assume this was part of a push to cancel DST entirely in 
Brazil, it looks like the government decided to cancel just two or three 
weeks' worth.
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