[tz] Re: Phoenix AZ timezone issue

[Paul Gilmartin via tz]

On 11/4/25 12:08, akbar--- via tz wrote:

      🧭 *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.
    ...

Problem solved long ago by the IANA timezone America/Phoenix.

--
gil