Mexico DST news

Jesper Norgaard Welen jnorgard at
Wed Jan 17 08:27:39 UTC 2007

I have not found any single news item that any political decision has been
taken whether to follow in Mexico the new US DST rule (that is a month
longer than the old one). After the legal fight between former president
Vicente Fox and former Mexico City mayor Manuel Lopez Obrador it was
clarified in supreme court that DST issues remain with the Congress.

On the page of the Energy Saving Trust of Mexico

it says that DST (spanish: horario de verano) will start in 2007 Sunday of April, and end Sunday of October (old US-style DST).

In the following page
there is an explanation of that USA will change their schedule to be from
Second Sunday of March at 2:00 until First Sunday of November at 2:00 while
Mexico will continue with the old DST that is from First Sunday of April at
2:00 to Last Sunday of October at 2:00.

However, I'm willing to bet a dinner on that Mexico will follow US from one
of these two scenarios:
(a) A hasty just-in-time decision puts Mexico on US DST just before
of March 2007.
(b) Next year, a decision is made to put Mexico on the new US style DST,
e.g. starting of March 2008.

Of course at the moment it looks like Mexico is in good company since Cuba,
Haiti and Turks & Caicos Islands will also follow old-style US DST. But that
is also a reason to keep a close eye on these countries, which might
possibly change to keep it simpler to do business with the US (essentially
the argument for Canada to change).

I found the page
which belongs to the Mexican Congrees (Camara de Diputados) that mentions
the different timezone rules in Mexico since 1921. A fair amount of it
corresponds well with the tz database (and therefore with Shanks, I presume)
but there are differences. If everything is taken literally, there are at
least a need to introduce new timezones for the states Campeche, Tamaulipas,
Tabasco+CHS, Baja California Sur, Durango, Veracruz+Oaxaca, and Coahuila.

Before I go too far with deciphering this, I would like to hear the general
opinion about if this is an authoritative source or not - after all the
Congress only recently got authority over timezone issues in Mexico
(formally), and this list might have some goofed up details from extracting
from old documents by "new" people.

It does seem odd that there is no activity between 1948 and 1981. But
perhaps we should just rely on Shanks for that period.

Particularly I would like Paul Eggert's/David Olson's opinion on this.

- Jesper

Jesper Nørgaard Welen
Email: jnorgard at	
Project Leader (Líder de Proyecto) Software
CIMMYT  -  Centro Internacional de Mejoramiento de Maíz y Trigo
Dirección: CIMMYT Int. c/o Jesper Nørgaard
Km. 45, Carretera México-Veracruz
El Batán
Texcoco, Edo. de México
CP 56130   MEXICO
Tel.:	+52 (55) 58-04-20-04  ext. 1374
Fax:	+52 (55) 58-04-75-58
Tel. Casa:   53-10-05-95  ó  53-10-97-78
Download the shareware program World Time Explorer, I made:

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