[tz] [PROPOSED PATCH] Guess Cayman Is will observe DST starting 2016

[Paul Eggert]

* NEWS: Document this.
* backzone (America/Cayman): Move from here ...
* northamerica: ... back to here, and assume US-style DST starting 2016.
* zone1970.tab (KY): Now a separate row, since KY and PA disagree
starting 2016.
---
 NEWS         |  5 +++++
 backzone     |  5 -----
 northamerica | 13 +++++++++++--
 zone1970.tab |  3 ++-
 4 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/NEWS b/NEWS
index 392f09b..d69a98c 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,11 @@ News for the tz database
 
 Unreleased, experimental changes
 
+  Changes affecting future time stamps
+
+    Assume Cayman Islands will observe DST starting next year, using US rules.
+    Although it isn't guaranteed, it is the most likely.
+
   Changes affecting data format
 
     The file 'iso3166.tab' now uses UTF-8, so that its entries can better
diff --git a/backzone b/backzone
index 6b392bd..0316708 100644
--- a/backzone
+++ b/backzone
@@ -279,11 +279,6 @@ Zone	America/Aruba	-4:40:24 -	LMT	1912 Feb 12 # Oranjestad
 			-4:30	-	ANT	1965 # Netherlands Antilles Time
 			-4:00	-	AST
 
-# Cayman Is
-Zone	America/Cayman	-5:25:32 -	LMT	1890     # Georgetown
-			-5:07:11 -	KMT	1912 Feb # Kingston Mean Time
-			-5:00	-	EST
-
 # Canada
 Zone America/Coral_Harbour -5:32:40 -	LMT	1884
 			-5:00	NT_YK	E%sT	1946
diff --git a/northamerica b/northamerica
index c3af9eb..88423e6 100644
--- a/northamerica
+++ b/northamerica
@@ -2661,7 +2661,17 @@ Zone Atlantic/Bermuda	-4:19:18 -	LMT	1930 Jan  1  2:00 # Hamilton
 			-4:00	US	A%sT
 
 # Cayman Is
-# See America/Panama.
+
+# From Paul Eggert (2015-05-15):
+# The Cayman government has decided to introduce DST in 2016, the idea being
+# to keep in sync with New York.  The legislation hasn't passed but the change
+# seems quite likely.  See: Meade B. Cayman 27.
+# http://www.cayman27.com.ky/2015/05/15/clock-ticks-toward-daylight-saving-time-in-cayman
+
+Zone	America/Cayman	-5:25:32 -	LMT	1890     # Georgetown
+			-5:07:11 -	KMT	1912 Feb # Kingston Mean Time
+			-5:00	-	EST	2016
+			-5:00	US	E%sT
 
 # Costa Rica
 
@@ -3184,7 +3194,6 @@ Zone	America/Managua	-5:45:08 -	LMT	1890
 Zone	America/Panama	-5:18:08 -	LMT	1890
 			-5:19:36 -	CMT	1908 Apr 22 # Colón Mean Time
 			-5:00	-	EST
-Link America/Panama America/Cayman
 
 # Puerto Rico
 # There are too many San Juans elsewhere, so we'll use 'Puerto_Rico'.
diff --git a/zone1970.tab b/zone1970.tab
index 5da0200..2689c00 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -206,6 +206,7 @@ KI	-0308-17105	Pacific/Enderbury	Phoenix Islands
 KI	+0152-15720	Pacific/Kiritimati	Line Islands
 KP	+3901+12545	Asia/Pyongyang
 KR	+3733+12658	Asia/Seoul
+KY	+1918-08123	America/Cayman
 KZ	+4315+07657	Asia/Almaty	most locations
 KZ	+4448+06528	Asia/Qyzylorda	Qyzylorda (Kyzylorda, Kzyl-Orda)
 KZ	+5017+05710	Asia/Aqtobe	Aqtobe (Aktobe)
@@ -259,7 +260,7 @@ NR	-0031+16655	Pacific/Nauru
 NU	-1901-16955	Pacific/Niue
 NZ,AQ	-3652+17446	Pacific/Auckland	New Zealand time
 NZ	-4357-17633	Pacific/Chatham	Chatham Islands
-PA,KY	+0858-07932	America/Panama
+PA	+0858-07932	America/Panama
 PE	-1203-07703	America/Lima
 PF	-1732-14934	Pacific/Tahiti	Society Islands
 PF	-0900-13930	Pacific/Marquesas	Marquesas Islands
-- 
2.1.0