Time zone · Americas
MST
Mexican Pacific Standard Time
Mexican Pacific Standard Time (MST) keeps things simple—seven hours behind UTC year-round with no daylight-saving surprises. If you are coordinating with Hermosillo or Mazatlan, you can count on a constant offset that stays put, making planning reliable whether you are scheduling cross-border calls or weekend beach trips along the Sea of Cortez.
Wednesday, October 14, 2026
Current offset
UTC-07:00
Standard · MST
Daylight saving
Not observed
Year-round standard time
IANA zones
2
None observe daylight saving
DST offset
—
No summer variant
About MST
A fixed, year-round offset.
Mexican Pacific Standard Time (MST) keeps things simple—seven hours behind UTC year-round with no daylight-saving surprises. If you are coordinating with Hermosillo or Mazatlan, you can count on a constant offset that stays put, making planning reliable whether you are scheduling cross-border calls or weekend beach trips along the Sea of Cortez.
IANA zones · the technical identifiers
The 2 zones that resolve to MST.
For software, always store the IANA identifier — never the abbreviation alone. The database keeps these zones distinct because their rules can, and historically did, diverge.
Cities across MST
Local time, city by city.
2 cities
Where MST is used
One country.
Same offset · UTC-07:00
Other zones at UTC-07:00 right now.
These named zones share MST's offset today. When daylight saving rules differ, they drift apart for part of the year.
Convert
MST to the world's clocks.
Frequently asked questions
Common questions about MST, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].
- Does Mexican Pacific Daylight Saving Time ever exist?
- Not any more. Sonora (Hermosillo) has stayed on UTC−07:00 all year since October 1998, and Sinaloa (Mazatlan) and the other states on this time stopped daylight saving time when Mexico abolished it in October 2022.
- Which cities fall under this timezone?
- Sonora, Sinaloa, Baja California Sur and most of Nayarit, including Hermosillo (Sonora's capital) and the tourist hub of Mazatlan.
- Why don't they observe daylight saving time?
- Sonora stopped changing clocks in 1998 to align more closely with neighboring Arizona, which also opts out of DST—simplifying trade and daily life across the border.
- Does this affect business hours compared to other Mexican regions?
- Not locally: both zones share the same fixed offset. But when interacting with Central Mexican Time (UTC−06:00), expect an hour difference without seasonal shifts.
- Is there any chance Mexico will reintroduce DST here?
- Unlikely. Sonora’s permanent MST aligns it with Arizona, and Mexico abolished nationwide DST in 2022, reinforcing stability for the region.
Source: IANA tzdb2026d · Reviewed
Free · Developer API
This time zone, as JSON.
Its defining offset, DST status and member counts, from one endpoint.
Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.
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