Jonathan Leffler <jonathan.leffler@gmail.com> #include <disclaimer.h> Guardian of DBD::Informix - v2018.1031 - http://dbi.perl.org "Blessed are we who can laugh at ourselves, for we shall never cease to be amused." On Tue, Nov 4, 2025 at 12:46 Matt Johnson-Pint via tz <tz@iana.org> wrote:
IMHO, AI slop doesn't warrant much of a response... but just to be pedantic:
- IANA zone America/Phoenix covers the primary concern - Phoenix uses UTC-7, not UTC+7 - IANA doesn't deal with display names - "Phoenix Standard Time (PST)" would be abhorrent for a display name, confused easily with "Pacific Standard Time (PST)" (UTC-8) - In the United States, the English names of time zones are regulated by congress via 49 CFR 71, so one cannot just propose new display names willy-nilly.
Did I miss anything?
Some parts of Arizona do use DST (Navajo nation), and within that, another part (Hopi nation) does not use DST. https://www.timeanddate.com/time/us/arizona-no-dst.html
On Tue, Nov 4, 2025 at 11:39 AM David Braverman via tz <tz@iana.org> wrote:
Sorry, that wasn’t fair.
Akbar, the time zone you’re looking for is America/Phoenix. It’s in the northamerica data file and it goes back to the advent of standard time in 1883.
David Braverman
*From:* David Braverman via tz <tz@iana.org> *Sent:* Tuesday 4 November 2025 13:35 *To:* tz@iana.org *Subject:* [tz] Re: Phoenix AZ timezone issue
Who’s going to tell him?
David Braverman
Inner Drive Technology
*From:* akbar--- via tz <tz@iana.org> *Sent:* Tuesday 4 November 2025 13:08 *To:* tz@iana.org *Subject:* [tz] Phoenix AZ timezone issue
🧭 *Problem Summary*
· Arizona remains one of the few U.S. states that *does not observe Daylight Saving Time (DST)* since 1968.
· However, it identifies its time zone as *Mountain Standard Time (MST)* — which *does* change to MDT when DST applies elsewhere.
· Because of this, every spring and fall, Arizona’s effective time alignment shifts:
o In *summer*, Arizona matches *Pacific Daylight Time (PDT)*.
o In *winter*, it matches *Mountain Standard Time (MST)*.
· This causes *systemic issues* in digital calendars, automated scheduling, flight bookings, and cross-state business coordination, requiring frequent manual adjustments. 💡 *Recommended Solution*
*Create and declare a dedicated time zone: “Phoenix Standard Time.”*
· This would be a fixed, non-DST time zone officially recognized by IANA (the Internet Assigned Numbers Authority) and major platforms (Microsoft, Apple, Google).
· All digital devices could use it as a *unique time zone identifier* that never shifts with DST — eliminating confusion and rescheduling errors.
· It would function similarly to “UTC+7” year-round but would display as “Phoenix Standard Time (PST)” in software systems.
Thank you
Akbar Jaffer
Akbar Jaffer
Office: (415) 335-6950
Mobile: (650) 430-0232 Web: Marketing-QA.com <http://www.marketing-qa.com/>
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