[tz] Fwd: Quintana Roo change to EST?

Tim Parenti tim at timtimeonline.com
Mon Jan 19 00:57:19 UTC 2015


Since the anticipated change is now less than two weeks away, I've 
drafted some patches, attached.

(0001 is just a minor fixup to a previous NEWS item for grammatical 
consistency.)

0002 simply shifts America/Cancun, the existing zone representing 
Quintana Roo state, ahead by one hour from CST with daylight saving to 
EST without, effective 2015-02-01 02:00.

As for 0003, which carves out a new zone for Felipe Carrillo Puerto's 
divergent history, it's not clear the extent to which this is actually 
necessary.  What did FCP actually do between 1998 and the present?  
Would someone calling local offices be effective in helping us find 
out?  (In the meantime, I've simply created this patch so we can at 
least get a sense of what it might look like; I don't actually feel that 
it should be applied at this time until these questions are resolved.)

--
Tim Parenti

On 14 Jan 2015 12:35, Carlos Raúl Perasso wrote:
> According to Boletín Nº 4764 from Mexico's Cámada de Diputados, the 
> modification of the Hour System Law in the United States of Mexico 
> (Ley del Sistema de Horario en los Estados Unidos Mexicanos) has been 
> approved, although this modification has not yet been published.
>
> Links:
>
> - Boletin Nº 4764: 
> http://www5.diputados.gob.mx/index.php/esl/Comunicacion/Boletines/2014/Diciembre/04/4764-Diputados-avalan-crear-la-Zona-Horaria-Sureste-para-Quintana-Roo
>
> - Ley del Sistema Horaio en los Estados Unidos Mexicanos: 
> http://www.diputados.gob.mx/LeyesBiblio/ref/lsheum.htm
>
> Saludos,
>
> Carlos
>
> On Wed, Jan 14, 2015 at 1:45 PM, Gwillim Law <gwillim at gmail.com 
> <mailto:gwillim at gmail.com>> wrote:
>
>     My translation of the cited article:
>
>     "... the new time zone will come into effect at two o'clock on the
>     first Sunday of February, when we will have to advance the clock
>     one hour from its current time, ...
>
>     "Federal deputy Lizbeth Gamboa Song stated that a new change for
>     the month of April is not considered as yet, given that only the
>     State will advance to summer time.
>
>     "Nevertheless, the deputy noted that Summer Time has applied in
>     Mexico since 1996, to which all entities of the federation adhere,
>     advancing their clocks one hour. In addition, she noted that it is
>     yet unknown whether Quintana Roo will participate in a further
>     change, but if so, the authorities will officially publish that
>     fact in due time."
>
>     My Spanish is not native level, but I think the article makes it
>     clear that the decision about DST for Quintana Roo has not yet
>     been made.
>
>     Gwillim Law
>
>     On Wed, Jan 14, 2015 at 10:43 AM, Steffen Thorsen
>     <thorsen at timeanddate.com <mailto:thorsen at timeanddate.com>> wrote:
>
>         On 08/12/14 14:18 , Steffen Thorsen wrote:
>
>             The Mexican state of Quintana Roo will likely change to
>             EST in 2015, by not
>             going back from DST in October 2015. Its a bit unclear if
>             they will still observe
>             DST the years after.
>
>         According to this source, Quintana Roo will change to EST as
>         soon as 1 February 2015 at 2am:
>         http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
>
>         Through Google Translate, it says "According to the
>         authorities, the term of the new time zone start at two
>         o'clock on the first Sunday of February, when we brought
>         forward one hour actual[?] hours, so the clock will be three
>         o'clock."
>
>         Also, the new zone will not use DST.
>
>
>         Best regards,
>         Steffen Thorsen - timeanddate.com <http://timeanddate.com>
>
>
>
>

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From 2f7e549fac892a4ac262c84579b375097beb45ff Mon Sep 17 00:00:00 2001
From: Tim Parenti <tim at timtimeonline.com>
Date: Sun, 18 Jan 2015 14:13:47 -0500
Subject: * NEWS: Slight consistency fix.

---
 NEWS | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/NEWS b/NEWS
index 99b8ea2..28623b7 100644
--- a/NEWS
+++ b/NEWS
@@ -4,8 +4,8 @@ Unreleased, experimental changes
 
   Changes affecting future time stamps
 
-    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49
-    (thanks to Tim Parenti).
+    New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
+    (Thanks to Tim Parenti.)
 
   Changes affecting past time stamps
 
-- 
2.1.1
-------------- next part --------------
From d266202619128406b96d400b48ade4e8446b463c Mon Sep 17 00:00:00 2001
From: Tim Parenti <tim at timtimeonline.com>
Date: Sun, 18 Jan 2015 14:14:01 -0500
Subject: America/Cancun switches to EST without DST on 2015-02-01.

* northamerica (America/Cancun): Switch to EST without DST on
2015-02-01 at 02:00.
* zone.tab, zone1970.tab: Update description for America/Cancun.
* NEWS: Document this.
---
 NEWS         |  4 ++++
 northamerica | 21 ++++++++++++++++++++-
 zone.tab     |  2 +-
 zone1970.tab |  2 +-
 4 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index 28623b7..b372dc8 100644
--- a/NEWS
+++ b/NEWS
@@ -7,6 +7,10 @@ Unreleased, experimental changes
     New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
     (Thanks to Tim Parenti.)
 
+    The Mexican state of Quintana Roo, represented by America/Cancun,
+    will shift from Central Time with DST to Eastern Time without DST
+    on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
+
   Changes affecting past time stamps
 
     Iceland observed DST in 1919 and 1921, and its 1939 fallback
diff --git a/northamerica b/northamerica
index de28529..cb94c5e 100644
--- a/northamerica
+++ b/northamerica
@@ -2297,6 +2297,24 @@ Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20
 # efecto desde las dos horas del segundo domingo de marzo y concluirá a
 # las dos horas del primer domingo de noviembre.
 
+# From Steffen Thorsen (2014-12-08), translated by Gwillim Law:
+# The Mexican state of Quintana Roo will likely change to EST in 2015.
+#
+# http://www.unioncancun.mx/articulo/2014/12/04/medio-ambiente/congreso-aprueba-una-hora-mas-de-sol-en-qroo
+# "With this change, the time conflict that has existed between the municipios
+# of Quintana Roo and the municipio of Felipe Carrillo Puerto may come to an
+# end. The latter declared itself in rebellion 15 years ago when a time change
+# was initiated in Mexico, and since then it has refused to change its time
+# zone along with the rest of the country."
+#
+# From Steffen Thorsen (2015-01-14), translated by Gwillim Law:
+# http://sipse.com/novedades/confirman-aplicacion-de-nueva-zona-horaria-para-quintana-roo-132331.html
+# "...the new time zone will come into effect at two o'clock on the first Sunday
+# of February, when we will have to advance the clock one hour from its current
+# time..."
+#
+# Also, the new zone will not use DST.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Mexico	1939	only	-	Feb	5	0:00	1:00	D
 Rule	Mexico	1939	only	-	Jun	25	0:00	0	S
@@ -2317,7 +2335,8 @@ Rule	Mexico	2002	max	-	Oct	lastSun	2:00	0	S
 Zone America/Cancun	-5:47:04 -	LMT	1922 Jan  1  0:12:56
 			-6:00	-	CST	1981 Dec 23
 			-5:00	Mexico	E%sT	1998 Aug  2  2:00
-			-6:00	Mexico	C%sT
+			-6:00	Mexico	C%sT	2015 Feb  1  2:00
+			-5:00	-	EST
 # Campeche, Yucatán; represented by Mérida
 Zone America/Merida	-5:58:28 -	LMT	1922 Jan  1  0:01:32
 			-6:00	-	CST	1981 Dec 23
diff --git a/zone.tab b/zone.tab
index a7373f1..f418e7f 100644
--- a/zone.tab
+++ b/zone.tab
@@ -274,7 +274,7 @@ MU	-2010+05730	Indian/Mauritius
 MV	+0410+07330	Indian/Maldives
 MW	-1547+03500	Africa/Blantyre
 MX	+1924-09909	America/Mexico_City	Central Time - most locations
-MX	+2105-08646	America/Cancun	Central Time - Quintana Roo
+MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
 MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatan
 MX	+2540-10019	America/Monterrey	Mexican Central Time - Coahuila, Durango, Nuevo Leon, Tamaulipas away from US border
 MX	+2550-09730	America/Matamoros	US Central Time - Coahuila, Durango, Nuevo Leon, Tamaulipas near US border
diff --git a/zone1970.tab b/zone1970.tab
index e971bc7..5da0200 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -233,7 +233,7 @@ MT	+3554+01431	Europe/Malta
 MU	-2010+05730	Indian/Mauritius
 MV	+0410+07330	Indian/Maldives
 MX	+1924-09909	America/Mexico_City	Central Time - most locations
-MX	+2105-08646	America/Cancun	Central Time - Quintana Roo
+MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
 MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatán
 MX	+2540-10019	America/Monterrey	Mexican Central Time - Coahuila, Durango, Nuevo León, Tamaulipas away from US border
 MX	+2550-09730	America/Matamoros	US Central Time - Coahuila, Durango, Nuevo León, Tamaulipas near US border
-- 
2.1.1
-------------- next part --------------
From 978109124abff7e8527ab3da5798228c938b8ff1 Mon Sep 17 00:00:00 2001
From: Tim Parenti <tim at timtimeonline.com>
Date: Sun, 18 Jan 2015 14:15:33 -0500
Subject: New zone America/FCP_QRoo.

* northamerica (America/FCP_QRoo): New zone for portions of Quintana Roo
state in Mexico which have observed EST without DST since 1998.
* zone.tab, zone1970.tab: Add entries for it, update description of
America/Cancun to reflect that it no longer represents all of Quintana Roo.
* NEWS: Document this.
---
 NEWS         |  4 ++++
 northamerica | 19 ++++++++++++++++++-
 zone.tab     |  3 ++-
 zone1970.tab |  3 ++-
 4 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/NEWS b/NEWS
index b372dc8..729ebbf 100644
--- a/NEWS
+++ b/NEWS
@@ -17,6 +17,10 @@ Unreleased, experimental changes
     transition was Oct. 29, not Nov. 29.  Remove incorrect data from
     Shanks about time in Iceland between 1837 and 1908.
 
+    A new zone, America/FCP_QRoo, for portions of the Mexican state of
+    Quintana Roo which have observed Eastern Time without DST since 1998.
+    (Thanks to Gwillim Law and Tim Parenti.)
+
     Some more zones have been turned into links, when they differed
     from existing zones only for older time stamps.  As usual,
     these changes affect UTC offsets in pre-1970 time stamps only.
diff --git a/northamerica b/northamerica
index cb94c5e..f80178b 100644
--- a/northamerica
+++ b/northamerica
@@ -2314,6 +2314,18 @@ Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20
 # time..."
 #
 # Also, the new zone will not use DST.
+#
+# From Tim Parenti (2015-01-18):
+# A new zone for Felipe Carrillo Puerto (FCP) is needed which apparently did not
+# switch to Central Time on 1998-08-02 with Cancún and the rest of Quintana Roo state.
+# Assume that the reference to FCP "refus[ing] to change its time zone" since then
+# refers to a refusal to observe DST, putting it out of sync with Cancún during the
+# winter.  Since there are multiple places within Mexico referred to as Felipe
+# Carrillo Puerto or Quintana Roo, use America/FCP_QRoo to refer to the municipio of
+# FCP inside the state of QRoo, abbreviating to stay under 14 characters.
+#
+# Since Cancún is shifting to EST without DST on 2015-02-01, this brings these regions
+# back into synchronicity with each other.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Mexico	1939	only	-	Feb	5	0:00	1:00	D
@@ -2331,12 +2343,17 @@ Rule	Mexico	2001	only	-	Sep	lastSun	2:00	0	S
 Rule	Mexico	2002	max	-	Apr	Sun>=1	2:00	1:00	D
 Rule	Mexico	2002	max	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
-# Quintana Roo; represented by Cancún
+# Most of Quintana Roo state; represented by Cancún
 Zone America/Cancun	-5:47:04 -	LMT	1922 Jan  1  0:12:56
 			-6:00	-	CST	1981 Dec 23
 			-5:00	Mexico	E%sT	1998 Aug  2  2:00
 			-6:00	Mexico	C%sT	2015 Feb  1  2:00
 			-5:00	-	EST
+# Felipe Carrillo Puerto municipio (within Quintana Roo state)
+Zone America/FCP_QRoo	-5:52:11 -	LMT	1922 Jan  1  0:07:49
+			-6:00	-	CST	1981 Dec 23
+			-5:00	Mexico	E%sT	1998 Aug  2  2:00
+			-5:00	-	EST
 # Campeche, Yucatán; represented by Mérida
 Zone America/Merida	-5:58:28 -	LMT	1922 Jan  1  0:01:32
 			-6:00	-	CST	1981 Dec 23
diff --git a/zone.tab b/zone.tab
index f418e7f..584dc85 100644
--- a/zone.tab
+++ b/zone.tab
@@ -274,7 +274,8 @@ MU	-2010+05730	Indian/Mauritius
 MV	+0410+07330	Indian/Maldives
 MW	-1547+03500	Africa/Blantyre
 MX	+1924-09909	America/Mexico_City	Central Time - most locations
-MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
+MX	+2105-08646	America/Cancun	Eastern Standard Time - most of Quintana Roo
+MX	+1935-08803	America/FCP_QRoo	Eastern Standard Time - Felipe Carrillo Puerto in Quintana Roo
 MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatan
 MX	+2540-10019	America/Monterrey	Mexican Central Time - Coahuila, Durango, Nuevo Leon, Tamaulipas away from US border
 MX	+2550-09730	America/Matamoros	US Central Time - Coahuila, Durango, Nuevo Leon, Tamaulipas near US border
diff --git a/zone1970.tab b/zone1970.tab
index 5da0200..09e0748 100644
--- a/zone1970.tab
+++ b/zone1970.tab
@@ -233,7 +233,8 @@ MT	+3554+01431	Europe/Malta
 MU	-2010+05730	Indian/Mauritius
 MV	+0410+07330	Indian/Maldives
 MX	+1924-09909	America/Mexico_City	Central Time - most locations
-MX	+2105-08646	America/Cancun	Eastern Standard Time - Quintana Roo
+MX	+2105-08646	America/Cancun	Eastern Standard Time - most of Quintana Roo
+MX	+1935-08803	America/FCP_QRoo	Eastern Standard Time - Felipe Carrillo Puerto in Quintana Roo
 MX	+2058-08937	America/Merida	Central Time - Campeche, Yucatán
 MX	+2540-10019	America/Monterrey	Mexican Central Time - Coahuila, Durango, Nuevo León, Tamaulipas away from US border
 MX	+2550-09730	America/Matamoros	US Central Time - Coahuila, Durango, Nuevo León, Tamaulipas near US border
-- 
2.1.1


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