[tz] Anecdotal discrepancy for Navajo nation in Arizona

Deborah Goldsmith goldsmit at apple.com
Wed May 25 05:11:13 UTC 2016

> How do OS X and iOS deal with local time in AZ/Navajo/Hopi/Page,
> and federal parks and facilities  in AZ?

I gave the one data point I have. :-)


> On May 24, 2016, at 8:53 PM, Brian Inglis <Brian.Inglis at systematicsw.ab.ca> wrote:
> On 2016-05-24 16:55, Arthur David Olson wrote:
>> On Tue, May 24, 2016 at 6:43 PM, Deborah Goldsmith
>> <goldsmit at apple.com <mailto:goldsmit at apple.com>> wrote:
>>> A colleague recently visited Page, Arizona, and the Navajo
>>> reservation right next to it.
>>> His phone must have been associated with a cell tower inside the
>>> Navajo nation, because his zone was set by NITZ to America/Denver
>>> (DST in effect). This matches the current TZ database. However, he
>>> observed that the parts of the Navajo nation adjacent to Page were
>>> actually observing the same time zone as Page (America/Phoenix, DST
>>> not in effect).
>>> I wouldn’t make any changes based on this one anecdote, but it might
>>> be worth checking if anyone has any sources inside the Navajo
>>> nation.
>> The source used back in 1987 (using--ahem--snail mail) was the Inter
>> Tribal Council of Arizona: http://itcaonline.com/.
> Nothing has changed in AZ, which has a daylight saving donut:
> http://www.lapahie.com/Pictures/Navajo_Map_Lg.jpg
> http://www.azcentral.com/story/news/local/arizona/2016/03/12/arizona-daylight-saving-time-navajo-hopi-nation-reservation/81597184/
> http://www.cntraveler.com/stories/2012-11-12/daylight-saving-donut-arizona-ken-jennings-maphead
> TL;DR:
> The Navajo nation includes areas in UT, CO, NM, which observe DST,
> so the parts in AZ also observe DST.
> Federal facilities and areas within AZ are subject to federal
> legislation so they too observe DST.
> The Hopi nation, encircled by the Navajo nation, but wholly within
> AZ, stays on MST.
> Page, while within the boundaries of the Navajo nation, was swapped
> for state land, so stays on MST.
> The time observed in any location will depend on the applicable
> legislation, and/or its main commercial links.
> The time you get from any cell tower may depend on its location
> and/or what the company considers its main service area.
> How do OS X and iOS deal with local time in AZ/Navajo/Hopi/Page,
> and federal parks and facilities  in AZ?
> -- 
> Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada

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