Southern Brazil starts DST two weeks later in 2018

* NEWS: Mention this.
* southamerica (Brazil): New rule just for spring 2018.

Author: eggert

NEWS

@@ -4,6 +4,7 @@ Unreleased, experimental changes
 
   Briefly:
   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
     accordingly.

southamerica

@@ -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):
 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
-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	-