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<p>Well, yes. On the first draw it was only a termination for DST
use on Mexico. Later, some amendments where set to move Chihuahua
to the "Zona Centro", as this was the original time zone until
1998.</p>
<p>Unfortunately, we haven't had any official publication, so I
still think it'll be chaos next Sunday as most of the electronic
devices on Chihuahua will go back one hour, when it has been
loudly spoken everywhere by media and politicians that the clock
wont be adjusted anymore there.</p>
<p>I don't see any easy and quick fix for this regarding TZDB.<br>
</p>
<div class="moz-cite-prefix">On 10/28/22 15:56, Tim Parenti via tz
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFpi07zTHPYs1brr_a8qj6fo+RkZAep0g9kU6LWmunVcDfKL-A@mail.gmail.com">
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<div dir="ltr" class="gmail_attr"><br>
On Fri, 28 Oct 2022 at 16:26, Paul Eggert <<a
href="mailto:eggert@cs.ucla.edu" target="_blank"
moz-do-not-send="true" class="moz-txt-link-freetext">eggert@cs.ucla.edu</a>>
wrote:</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">On the other hand it also
says that the much larger Ciudad Juárez (which<br>
will become -06 with US DST rules) will now start to
disagree with the<br>
nearby El Paso (-07 with US DST rules) - that is, starting
Sunday the<br>
two neighboring cities will almost invariably disagree about
the time of<br>
day.</blockquote>
<div><br>
</div>
<div>
<div>For what it's worth, the draft law circulated in July
lists the state of Chihuahua in the "Zona Pacifico",
corresponding to 105°W or UTC-07. See Chapter 1, Article
3(II):<br>
</div>
<div><a
href="http://gaceta.diputados.gob.mx/PDF/65/2022/jul/20220706-III.pdf#page=23"
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">http://gaceta.diputados.gob.mx/PDF/65/2022/jul/20220706-III.pdf#page=23</a></div>
</div>
<div>So the image from the Energy Secretary on Twitter,
putting the entirety of Chihuahua in "Zona Centro" (UTC-06),
is at least a departure from that draft.</div>
<div><a
href="https://twitter.com/rocionahle/status/1585682205417799688"
moz-do-not-send="true" class="moz-txt-link-freetext">https://twitter.com/rocionahle/status/1585682205417799688</a><br>
</div>
<div>(Chapter 2 of the draft from July puts all of Chihuahua's
border area into UTC-06 during US DST; that is, the status
quo.)<br>
</div>
<div><br>
</div>
<div>There does at least seem to be some amount of general
confusion on social media based on a cursory Twitter
search. So without updated legal text in front of us, we're
not really going to be able to verify this much better, as
there's only so much we can likely glean from sparse news
reports.</div>
<div><br>
</div>
<div>One possible scenario: The bulk of Chihuahua would move
into "Zona Centro" (UTC-06) by not changing its clocks this
weekend, while the existing arrangement of -07/-06 with US
DST could continue along Chihuahua's entire border region.
This would have the net effect that Juárez would be behind
the rest of Chihuahua in the winter, rather than ahead of it
in the summer, and would maintain year-round compatibility
between Ciudad Juárez, El Paso County, and Hudspeth County,
while also maintaining the existing year-round one-hour
difference from places like Ojinaga to Presidio and Brewster
Counties.</div>
<div><br>
</div>
<div>Alternatively, supposing -07/-06 is maintained in Juárez
and environs, maybe the eastern portions of Chihuahua's
border region might follow the rest of Chihuahua in
advancing their logical zone into "Zona Centro". Assuming
those border areas continue to observe US DST rules, that
would put them on -06/-05, eliminating nearby cross-border
time differences east of some point, but necessitating a
line to be drawn somewhere to separate the two timekeeping
regimes. Assuming an extension of the Texas' time zone
boundary between Hudspeth and Presidio Counties, that would
put such a dividing line near Lomas de Arena in Chihuahua.<br>
</div>
<div><br>
</div>
<div>All of the above is just speculation on how individual
municipalities and regions might end up aligning their
timekeeping if they're operating on the same (limited)
information we have. Perhaps local officials do know more
about the details, but if so, we haven't yet seen them.</div>
<div><br>
</div>
<div>This may be one of those (thankfully rare) cases where,
knowing there is potential for much confusion and that we
really can't get anything out ahead of the changes anyway,
it may just be best to "wait and see" what folks actually
begin observing before making descriptive updates to the
data. Which is a shame, given how long this has been on our
radar.</div>
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<div>
<div dir="ltr">--<br>
Tim Parenti</div>
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