[tz] Mexico on track to abolish DST

gera tz at gera.me
Fri Oct 28 22:44:17 UTC 2022


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.

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.

I don't see any easy and quick fix for this regarding TZDB.

On 10/28/22 15:56, Tim Parenti via tz wrote:
>
> On Fri, 28 Oct 2022 at 16:26, Paul Eggert <eggert at cs.ucla.edu> wrote:
>
>     On the other hand it also says that the much larger Ciudad Juárez
>     (which
>     will become -06 with US DST rules) will now start to disagree with the
>     nearby El Paso (-07 with US DST rules) - that is, starting Sunday the
>     two neighboring cities will almost invariably disagree about the
>     time of
>     day.
>
>
> 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):
> http://gaceta.diputados.gob.mx/PDF/65/2022/jul/20220706-III.pdf#page=23
> 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.
> https://twitter.com/rocionahle/status/1585682205417799688
> (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.)
>
> 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.
>
> 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.
>
> 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.
>
> 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.
>
> 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.
>
> --
> Tim Parenti
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