MST Time Now
See fixed MST beside Phoenix and Denver, then choose the rule your source means before converting.
MST vs Mountain Time
Fixed MST and Denver now
Checking Denver…
Phoenix uses MST at UTC−7 year-round and matches the fixed clock above.
MST is fixed at UTC−7, but Mountain Time can change
Mountain Standard Time (MST) is seven hours behind UTC. Regional Mountain Time is a civil-time rule: Denver uses MST in winter and Mountain Daylight Time (MDT) at UTC−6 during daylight saving time. This is why a search for “MST time” can show a dynamic Mountain Time clock instead of a fixed UTC−7 clock.
Denver and Phoenix can differ by one hour
Denver follows the America/Denver IANA rule and changes between MST and MDT. Phoenix follows America/Phoenix and remains on MST. In winter their clocks normally match; in summer Denver is one hour ahead. Phoenix represents most of Arizona, but the Navajo Nation observes daylight saving time.
Choose the meaning before converting
Select fixed MST when the source explicitly promises UTC−7, Denver Mountain Time when the sender means a date-aware Mountain-region clock, or Phoenix time when the location is Phoenix. The result keeps the source label, destination time, UTC equivalent, and Denver’s actual MST or MDT status together.
Daylight-saving gaps and repeated times are validated
A Denver time skipped during the spring clock change is rejected. During the fall overlap, an unlabeled Denver time uses the earlier MDT occurrence and shows a warning; an explicit MST suffix identifies the later standard-time occurrence. Fixed MST and Phoenix have no seasonal clock gap.
This page does not replace the batch or city planners
This checker handles one ambiguous MST or Mountain Time value and converts it to any listed destination. For many Mountain-to-Eastern rows, use the MST to EST converter. For a Colorado or Phoenix workday and shared-hours plan, use the dedicated city pages.
Scope and privacy
The checker uses browser IANA time-zone data for dates from 2000 through 2100. Your selected meaning, date, time, and destination zone stay in your browser and are not sent to ToolNeko.
Frequently asked questions
Where is the MST time zone?
Mountain Standard Time is fixed at UTC−7. Phoenix and most of Arizona use MST year-round, while Denver and many Mountain regions use MST in winter and MDT at UTC−6 during daylight saving time.
Is Mountain Time MST or MDT?
It depends on the place and date. Denver Mountain Time is MST in winter and MDT in summer. Phoenix remains on MST year-round. Select the intended rule above before converting a dated time.
Is MST two or three hours behind Eastern Time?
Fixed MST is two hours behind fixed EST and three hours behind EDT. Denver regional Mountain Time is normally two hours behind New York regional Eastern Time, but transition dates can create short exceptions.
Does Arizona use MST all year?
Phoenix and most of Arizona use MST at UTC−7 all year. The Navajo Nation observes daylight saving time, so do not apply the Phoenix rule to every location in Arizona.
What is MST time in the Philippines?
The Philippines is 15 hours ahead of fixed MST. When Denver is on MDT, Manila is 14 hours ahead of Denver. Because the calendar date can roll over, use the dated converter rather than adding hours mentally.
Is Alberta on MST or MDT?
Alberta is at UTC−6 in September 2026. Beginning November 2026, it no longer moves back to MST and remains on permanent Alberta Time at UTC−6. This checker models Denver and Phoenix, not Alberta.
Why can 1:30 AM happen twice in Denver?
When Denver clocks move back, the 1:00 AM hour repeats once in MDT and once in MST. An unlabeled Denver Mountain Time uses the earlier MDT occurrence and displays a warning; an explicit MST suffix selects the later occurrence.