[tz] [PROPOSED 2/2] Simplify three Ukraine zones to one

Paul Eggert eggert at cs.ucla.edu
Sat Aug 27 20:36:55 UTC 2022 

* backward: New backward-compatibility links for the moved zones.
* backzone (Europe/Uzhgorod, Europe/Zaporozhye): Move zones here ...
* europe: ... from here.
* zone.tab, zone1970.tab (Europe/Uzhgorod, Europe/Zaporozhye):
Remove.
---
 NEWS         |  6 ++++++
 backward     |  2 ++
 backzone     | 38 ++++++++++++++++++++++++++++++++++++++
 europe       | 42 ------------------------------------------
 zone.tab     |  2 --
 zone1970.tab |  2 --
 6 files changed, 46 insertions(+), 46 deletions(-)

diff --git a/NEWS b/NEWS
index c4abb32..126822e 100644
--- a/NEWS
+++ b/NEWS
@@ -30,6 +30,7 @@ Release 2022b - 2022-08-10 15:38:32 -0700
     Chile's DST is delayed by a week in September 2022.
     Iran no longer observes DST after 2022.
     Rename Europe/Kiev to Europe/Kyiv.
+    Simplify three Ukraine zones into one.
     New zic -R option
     Vanguard form now uses %z.
     Finish moving duplicate-since-1970 zones to 'backzone'.
@@ -46,6 +47,11 @@ Release 2022b - 2022-08-10 15:38:32 -0700
 
   Changes to past timestamps
 
+    Simplify three Ukraine zones to one, since the post-1970
+    differences seem to have been imaginary.  Move Europe/Uzhgorod and
+    Europe/Zaporozhye to 'backzone'; backward-compatibility links
+    still work, albeit with different timestamps before October 1991.
+
     Finish moving to 'backzone' the location-based zones whose
     timestamps since 1970 are duplicates; adjust links accordingly.
     This change ordinarily affects only pre-1970 timestamps, and with
diff --git a/backward b/backward
index e162eeb..14e4b14 100644
--- a/backward
+++ b/backward
@@ -90,6 +90,8 @@ Link	Etc/UTC			Etc/UCT
 Link	Europe/London		Europe/Belfast
 Link	Europe/Kyiv		Europe/Kiev
 Link	Europe/Chisinau		Europe/Tiraspol
+Link	Europe/Kyiv		Europe/Uzhgorod
+Link	Europe/Kyiv		Europe/Zaporozhye
 Link	Europe/London		GB
 Link	Europe/London		GB-Eire
 Link	Etc/GMT			GMT+0
diff --git a/backzone b/backzone
index c2448a8..929031f 100644
--- a/backzone
+++ b/backzone
@@ -1480,6 +1480,26 @@ Zone	Europe/Tiraspol	1:58:32	-	LMT	1880
 			2:00	Russia	EE%sT	1992 Jan 19  2:00
 			3:00	Russia	MSK/MSD
 
+# Ukraine
+#
+# Although Shanks & Pottenger say Transcarpathia used CET 1990/1991,
+# this unreliable source contradicts contemporaneous government resolutions
+# so for now this dubious zone is in 'backzone'.
+# "Uzhhorod" is the transliteration of the Rusyn/Ukrainian pronunciation, but
+# "Uzhgorod" was a common English spelling when this dubious zone was
+# added to TZDB in 1999.
+Zone Europe/Uzhgorod	1:29:12 -	LMT	1890 Oct
+			1:00	-	CET	1940
+			1:00	C-Eur	CE%sT	1944 Oct
+			1:00	1:00	CEST	1944 Oct 26
+			1:00	-	CET	1945 Jun 29
+			3:00	Russia	MSK/MSD	1990
+			3:00	-	MSK	1990 Jul  1  2:00
+			1:00	-	CET	1991 Mar 31  3:00
+			2:00	-	EET	1992 Mar 20
+			2:00	C-Eur	EE%sT	1996 May 13
+			2:00	EU	EE%sT
+
 # Liechtenstein
 
 # From Paul Eggert (2022-07-21):
@@ -1502,6 +1522,24 @@ Zone	Europe/Zagreb	1:03:52	-	LMT	1884
 			1:00	-	CET	1982 Nov 27
 			1:00	EU	CE%sT
 
+# Ukraine
+
+# Although Shanks & Pottenger say Zaporizhzhia and eastern Lugansk
+# observed DST 1990/1991, this unreliable source contradicts contemporaneous
+# government resolutions so for now this dubious zone is in 'backzone'.
+# "Zaporizhzhia" is the transliteration of the Ukrainian name, but
+# "Zaporozhye" was a common English spelling when this dubious zone was
+# added to TZDB in 1999.
+Zone Europe/Zaporozhye	2:20:40 -	LMT	1880
+			2:20	-	+0220	1924 May  2
+			2:00	-	EET	1930 Jun 21
+			3:00	-	MSK	1941 Aug 25
+			1:00	C-Eur	CE%sT	1943 Oct 25
+			3:00	Russia	MSK/MSD	1991 Mar 31  2:00
+			2:00	E-Eur	EE%sT	1992 Mar 20
+			2:00	C-Eur	EE%sT	1996 May 13
+			2:00	EU	EE%sT
+
 # Madagascar
 Zone Indian/Antananarivo 3:10:04 -	LMT	1911 Jul
 			3:00	-	EAT	1954 Feb 27 23:00s
diff --git a/europe b/europe
index 956f670..8db0130 100644
--- a/europe
+++ b/europe
@@ -3826,21 +3826,7 @@ Link	Europe/Istanbul	Asia/Istanbul	# Istanbul is in both continents.
 # * Ukrainian Government's Resolution of 20.03.1992, No. 139.
 # http://www.uazakon.com/documents/date_8u/pg_grcasa.htm
 
-# From Paul Eggert (2022-04-12):
-# As is usual in tzdb, Ukrainian zones use the most common English spellings.
-# In particular, tzdb's name Europe/Kyiv uses the most common spelling in
-# English for Ukraine's capital.  Although tzdb's former name was Europe/Kiev,
-# "Kyiv" is now more common due to widespread reporting of the current conflict.
-# Conversely, tzdb continues to use the names Europe/Uzhgorod and
-# Europe/Zaporozhye; this is similar to tzdb's use of Europe/Prague, which is
-# certainly wrong as a transliteration of the Czech "Praha".
-# English-language spelling of Ukrainian names is in flux, and
-# some day "Uzhhorod" or "Zaporizhzhia" may become substantially more
-# common in English; in the meantime, do not change these
-# English spellings as that means less disruption for our users.
-
 # Zone	NAME		STDOFF	RULES	FORMAT	[UNTIL]
-# This represents most of Ukraine.  See above for the spelling of "Kyiv".
 Zone Europe/Kyiv	2:02:04 -	LMT	1880
 			2:02:04	-	KMT	1924 May  2 # Kyiv Mean Time
 			2:00	-	EET	1930 Jun 21
@@ -3850,34 +3836,6 @@ Zone Europe/Kyiv	2:02:04 -	LMT	1880
 			2:00	1:00	EEST	1991 Sep 29  3:00
 			2:00	C-Eur	EE%sT	1996 May 13
 			2:00	EU	EE%sT
-# Transcarpathia used CET 1990/1991.
-# "Uzhhorod" is the transliteration of the Rusyn/Ukrainian pronunciation, but
-# "Uzhgorod" is more common in English.
-Zone Europe/Uzhgorod	1:29:12 -	LMT	1890 Oct
-			1:00	-	CET	1940
-			1:00	C-Eur	CE%sT	1944 Oct
-			1:00	1:00	CEST	1944 Oct 26
-			1:00	-	CET	1945 Jun 29
-			3:00	Russia	MSK/MSD	1990
-			3:00	-	MSK	1990 Jul  1  2:00
-			1:00	-	CET	1991 Mar 31  3:00
-			2:00	-	EET	1992 Mar 20
-			2:00	C-Eur	EE%sT	1996 May 13
-			2:00	EU	EE%sT
-# Zaporozh'ye and eastern Lugansk oblasts observed DST 1990/1991.
-# "Zaporizhzhia" is the transliteration of the Ukrainian name, but
-# "Zaporozh'ye" is more common in English.  Use the common English
-# spelling, except omit the apostrophe as it is not allowed in
-# portable Posix file names.
-Zone Europe/Zaporozhye	2:20:40 -	LMT	1880
-			2:20	-	+0220	1924 May  2
-			2:00	-	EET	1930 Jun 21
-			3:00	-	MSK	1941 Aug 25
-			1:00	C-Eur	CE%sT	1943 Oct 25
-			3:00	Russia	MSK/MSD	1991 Mar 31  2:00
-			2:00	E-Eur	EE%sT	1992 Mar 20
-			2:00	C-Eur	EE%sT	1996 May 13
-			2:00	EU	EE%sT
 
 # Vatican City
 # See Europe/Rome.
diff --git a/zone.tab b/zone.tab
index 1f73dda..4904028 100644
--- a/zone.tab
+++ b/zone.tab
@@ -401,8 +401,6 @@ TV	-0831+17913	Pacific/Funafuti
 TW	+2503+12130	Asia/Taipei
 TZ	-0648+03917	Africa/Dar_es_Salaam
 UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
-UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
-UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
 UG	+0019+03225	Africa/Kampala
 UM	+2813-17722	Pacific/Midway	Midway Islands
 UM	+1917+16637	Pacific/Wake	Wake Island
diff --git a/zone1970.tab b/zone1970.tab
index 19515f7..cf9cf20 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -312,8 +312,6 @@ TO	-210800-1751200	Pacific/Tongatapu
 TR	+4101+02858	Europe/Istanbul
 TW	+2503+12130	Asia/Taipei
 UA	+5026+03031	Europe/Kyiv	Ukraine (most areas)
-UA	+4837+02218	Europe/Uzhgorod	Transcarpathia
-UA	+4750+03510	Europe/Zaporozhye	Zaporozhye and east Lugansk
 US	+404251-0740023	America/New_York	Eastern (most areas)
 US	+421953-0830245	America/Detroit	Eastern - MI (most areas)
 US	+381515-0854534	America/Kentucky/Louisville	Eastern - KY (Louisville area)
-- 
2.37.2

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