On 11/4/25 12:08, akbar--- via tz wrote:
🧠*Problem Summary*
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Arizona remains one of the few U.S. states that *does not observe Daylight Saving Time (DST)*Â since 1968.
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However, it identifies its time zone as *Mountain Standard Time (MST)* — which /does/ change to MDT when DST applies elsewhere.
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Because of this, every spring and fall, Arizona’s effective time alignment shifts:
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In *summer*, Arizona matches *Pacific Daylight Time (PDT)*.
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In *winter*, it matches *Mountain Standard Time (MST)*.
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This causes *systemic issues*Â in digital calendars, automated scheduling, flight bookings, and cross-state business coordination, requiring frequent manual adjustments.
đź’ˇ *Recommended Solution*
*Create and declare a dedicated time zone: “Phoenix Standard Time.”*
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This would be a fixed, non-DST time zone officially recognized by IANA (the Internet Assigned Numbers Authority) and major platforms (Microsoft, Apple, Google).
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All digital devices could use it as a *unique time zone identifier* that never shifts with DST — eliminating confusion and rescheduling errors.
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It would function similarly to “UTC+7” year-round but would display as “Phoenix Standard Time (PST)” in software systems. ...
Problem solved long ago by the IANA timezone America/Phoenix. -- gil