KEEP THE
EVENING LIGHT

State guide / America/Phoenix

Evening light
in Arizona.

Phoenix stays on Mountain Standard Time throughout the year. Our scenario retains that exception. Navajo Nation observes DST; the Hopi reservation does not. Phoenix is not a proxy for every Arizona community. Tucson uses the same Mountain Standard Time exception in this model.

January 15, 2026 · a reference winter day

Phoenix

Standard: sunrise 7:32 AM, sunset 5:42 PM.
Scenario: sunrise 7:32 AM, sunset 5:42 PM.

Existing standard-time exception retained; no added hour. Approximate times; same amount of daylight.

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Tucson

Standard: sunrise 7:24 AM, sunset 5:40 PM.
Scenario: sunrise 7:24 AM, sunset 5:40 PM.

Existing standard-time exception retained; no added hour. Approximate times; same amount of daylight.

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What this guide establishes

This explains geography and clock policy, not the status of any state bill. BTS describes federal authority and exceptions. NIST describes observance. Consult the federal tracker for verification limits.

Reviewed 2026-11-02. Census coordinates; NOAA algorithm; IANA time zones. Sources and caveats.