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.
Friday, June 5, 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 currently on MST
The same hour, city by city.
2 cities · all UTC-07:00
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.
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?
- No. Since late 1998, this region has stayed on permanent standard time (UTC−07:00). There are no future clock changes expected.
- Which cities fall under this timezone?
- Primarily coastal Sonora and Sinaloa in Mexico, 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.
- What’s unique about living on Mexican Pacific Standard Time?
- Residents enjoy predictable sunrise and sunset times—ideal for outdoor activities in places like the beaches of Mazatlan or the deserts of Sonora, where life follows the steady rhythm of the sun.
Free · Developer API
Time, as JSON.
Every IANA time zone with live offsets, DST status, and the countries and cities that use them — clean, dependable JSON. Sign up free and get an API key in seconds.
countries, cities, convert, DST transitions coming next.
Get your free API key →