[tz] incorrect timezone info from tar files

[Guy Harris]

On Dec 4, 2019, at 6:07 PM, Benjamin Weiser <Benjamin.Weiser at inrix.com> wrote:

> I still see an issue with Brazil. Are those to be assumed as updated as well? I’m still seeing, for example in America/Sao_Paulo:
> 
>  
> 
> Zone America/Sao_Paulo             -3:06:28   -          LMT       1914
>                                    -3:00      Brazil     -03/-02   1963 Oct 23  0:00
>                                    -3:00      1:00       -02       1964
>                                    -3:00      Brazil     -03/-02
> 
> The last line would indicate that its still following daylight savings, which Brazil scrapped this year.

No, it doesn't.  It says that it's following the "Brazil" rules, which are, in the 2019b and 2019c releases:

	...

Rule	Brazil	2008	2017	-	Oct	Sun>=15	0:00	1:00	-
Rule	Brazil	2008	2011	-	Feb	Sun>=15	0:00	0	-
Rule	Brazil	2012	only	-	Feb	Sun>=22	0:00	0	-
Rule	Brazil	2013	2014	-	Feb	Sun>=15	0:00	0	-
Rule	Brazil	2015	only	-	Feb	Sun>=22	0:00	0	-
Rule	Brazil	2016	2019	-	Feb	Sun>=15	0:00	0	-
Rule	Brazil	2018	only	-	Nov	Sun>=1	0:00	1:00	-

which says that (among other things, but I omitted the earlier rules that go back to 1931):

	on the third Sunday in October 2008-2017, the clocks are set forward to 1 hour ahead of standard time;

	on the third Sunday in February 2008-2011, the clocks are set backward to standard time;

	on the fourth Sunday in February 2012, the clocks are set backward to standard time;

	on the third Sunday in February 2013-2014, the clocks are set backward to standard time;

	on the fourth Sunday in February 2015, the clocks are set to standard time;

	on the third Sunday in February 2016-2019, the clocks are set to standard time;

	on the first Sunday in November 2018, the clocks are set forward to 1 hour ahead of standard time;

so they got set to standard time on 2019-02-17 and have not been set forward since - in particular, they were not set forward in November.