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America/Phoenix

America/Phoenix is the IANA time zone for MST – AZ (except Navajo) in the United States.

UTC−07:00

Mon, Sep 28 UTC−7 MST

Offsets and daylight saving time

Standard offset
UTC−07:00
Rule
No daylight saving time: UTC−7 all year.

No clock changes are scheduled in the next three years.

Names

Generic name
Mountain Standard Time
Abbreviation
MST
Long name
Mountain Standard Time
Aliases
MST and US/Arizona (old ids that resolve to America/Phoenix)

Use it in code

// JavaScript
new Intl.DateTimeFormat('en-US', { timeZone: 'America/Phoenix' })

# Python
from zoneinfo import ZoneInfo
ZoneInfo('America/Phoenix')

-- PostgreSQL
SELECT now() AT TIME ZONE 'America/Phoenix';

Cities in America/Phoenix

Also in this zone: Tucson, Mesa, Chandler, Gilbert, Glendale, Scottsdale, Peoria, Tempe, Tempe Junction, Surprise.

Offset history since 1970

  • 1970–2026: UTC−7

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