[tz] Error in America/Ojinaga

Brian Inglis Brian.Inglis at SystematicSw.ab.ca
Sat Dec 10 08:24:01 UTC 2022

On 2022-12-09 15:11, Tim Parenti via tz wrote:
> On Fri, 9 Dec 2022 at 16:46, Nikos (Nikolaos) Papadakos, PhD wrote:
>> Our customer is a major airline in Mexico and they tell me the time
>> should America/Ojinaga should be the same as America/Denver.
> It is our understanding that the recent changes split time zone observances 
> along Chihuahua's northern border.  According to that split, from 2022-11-30, 
> Ojinaga is like America/Chicago, while Ciudad Juárez is like America/Denver.
>> III. Para el Estado de Baja California, así como para los municipios
>> de Janos, Ascensión, Juárez, Praxedis G. Guerrero y Guadalupe, del
>> Estado de Chihuahua, acorde a sus correlativos a su franja fronteriza,
>> se aplica el meridiano 105 grados al oeste de Greenwich."
> While the above describes that the municipio of Juárez (including its municipal 
> seat, Ciudad Juárez) observes a standard time of UTC-7, which is like 
> America/Denver, the section immediately prior reads:
>   II. Para los municipios de Coyame del Sotol, Ojinaga y Manuel Benavides,
>   del Estado de Chihuahua, acorde a sus correlativos a su franja fronteriza,
>   se aplica el meridiano 90 grados al oeste de Greenwich;
> …meaning that the city and municipio of Ojinaga follow UTC-6, which is like 
> America/Chicago.
> A new zone, America/Ciudad_Juarez, was split off from America/Ojinaga in 2022g 
> to allow for these differences in timekeeping. Since this zone did not exist 
> prior to 2022g, those in the western portions of Chihuahua's border region 
> (including Juárez) will need to switch to it, as the time in and around Juárez 
> and Chihuahua's northwest no longer matches the time in Ojinaga and Chihuahua's 
> northeast.
Nor the time in Chihuahua's interior which is on CST like Ojinaga.
The airline can check the IATA SSIM Schedule Time Zones for CUU/MMC Chihuahua 
and CJS/MMCS Ciudad Juarez to confirm the changes (Ojinaga has no airport).

Take care. Thanks, Brian Inglis			Calgary, Alberta, Canada

La perfection est atteinte			Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter	not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer	but when there is no more to cut
			-- Antoine de Saint-Exupéry

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