[tz] Turkey reintroduces DST next year

[Paul Eggert]

Thanks for the heads-up. I installed the attached patches into the development 
version. The first one is your patch, but with a slightly altered commit 
message. The second adds a NEWS item about the change, and alters the spelling 
of your name to be what I hope is the proper one since the source code allows 
UTF-8 in comments. (If you prefer the Anglicized spelling, please let me know.)
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From 25632eb33943fbb42220f1cc99c3f7cd070a986c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?K=C4=B1van=C3=A7=20Yazan?= <kivancyazan at gmail.com>
Date: Fri, 27 Oct 2017 23:16:14 -0700
Subject: [PATCH 1/2] Turkey reintroduces DST on 2018-10-28

* europe (Europe/Istanbul): Revert to +02/+03 with EU rules
on 2018-10-28 at 01:00 UTC.
---
 europe | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/europe b/europe
index 5b3b4e5..50720bd 100644
--- a/europe
+++ b/europe
@@ -3582,6 +3582,10 @@ Zone	Europe/Zurich	0:34:08 -	LMT	1853 Jul 16 # See above comment.
 # The change is permanent, so this is the new standard time in Turkey.
 # It takes effect today, which is not much notice.
 
+# From Kivanc Yazan (2017-10-28):
+# Turkey will go back to Daylight Saving Time starting 2018/10.
+# http://www.resmigazete.gov.tr/eskiler/2017/10/20171028-5.pdf
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Turkey	1916	only	-	May	 1	0:00	1:00	S
 Rule	Turkey	1916	only	-	Oct	 1	0:00	0	-
@@ -3654,7 +3658,8 @@ Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 			2:00	EU	EE%sT	2015 Oct 25  1:00u
 			2:00	1:00	EEST	2015 Nov  8  1:00u
 			2:00	EU	EE%sT	2016 Sep  7
-			3:00	-	+03
+			3:00	-	+03	2018 Oct  28  1:00u
+			2:00	EU	EE%sT
 Link	Europe/Istanbul	Asia/Istanbul	# Istanbul is in both continents.
 
 # Ukraine
-- 
2.7.4
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From c43758379137576bc58784b28842df28aad1c8b5 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert at cs.ucla.edu>
Date: Sun, 29 Oct 2017 00:16:24 -0700
Subject: [PATCH 2/2] Mention Turkey in NEWS

* NEWS: Mention Turkey change.
* europe: Tweak commentary.
---
 NEWS   | 9 +++++++++
 europe | 6 +++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index 6e19a92..8c1241f 100644
--- a/NEWS
+++ b/NEWS
@@ -2,6 +2,15 @@ News for the tz database
 
 Unreleased, experimental changes
 
+  Briefly:
+  Turkey switches from +03 to +02/+03 with EU DST on 2018-10-28.
+
+  Changes to future time stamps
+
+    Turkey will switch back from +03 to +02/+03 and resume EU rules
+    starting 2018-10-28, thus reinstituting winter time.  (Thanks to
+    Kıvanç Yazan.)
+
   Changes to past time stamps
 
     A discrepancy of 4 s in timestamps before 1931 in South Sudan has
diff --git a/europe b/europe
index 50720bd..cf6d7e4 100644
--- a/europe
+++ b/europe
@@ -3582,8 +3582,8 @@ Zone	Europe/Zurich	0:34:08 -	LMT	1853 Jul 16 # See above comment.
 # The change is permanent, so this is the new standard time in Turkey.
 # It takes effect today, which is not much notice.
 
-# From Kivanc Yazan (2017-10-28):
-# Turkey will go back to Daylight Saving Time starting 2018/10.
+# From Kıvanç Yazan (2017-10-28):
+# Turkey will go back to Daylight Saving Time starting 2018-10.
 # http://www.resmigazete.gov.tr/eskiler/2017/10/20171028-5.pdf
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
@@ -3658,7 +3658,7 @@ Zone	Europe/Istanbul	1:55:52 -	LMT	1880
 			2:00	EU	EE%sT	2015 Oct 25  1:00u
 			2:00	1:00	EEST	2015 Nov  8  1:00u
 			2:00	EU	EE%sT	2016 Sep  7
-			3:00	-	+03	2018 Oct  28  1:00u
+			3:00	-	+03	2018 Oct 28  1:00u
 			2:00	EU	EE%sT
 Link	Europe/Istanbul	Asia/Istanbul	# Istanbul is in both continents.
 
-- 
2.7.4