MST

Mountain Standard Time

GMT -7

12am

3am

6am

9am

12pm

3pm

6pm

9pm

Use this MST Converter page to check current local time, UTC and GMT offset, daylight saving details, related time zones, and popular time converter links.

Mountain Standard Time

Offset: MST is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries using this time zone: Canada, Mexico, United States

Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.446 million people. Other major cities in this time zone include Calgary, Edmonton, El Paso, Denver.

French: HNR - Heure Normale des Rocheuses

Spanish: MT - Zona Pacífico

MST Time Zone Geo Map — MST timezone map

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).

Start: Mountain Standard Time (MST) started on Sunday, November 2, 2025 at 2:00 am local time and clocks were set one hour back to Sunday, November 2, 2025, 1:00 am. Standard time starts annually on the first Sunday of November.

End: Mountain Standard Time (MST) ends on Sunday, March 8, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, March 8, 2026, 3:00 am local daylight time instead. Standard time ends annually on the second Sunday of March.

MST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data

-07 - basic short
-0700 - basic
-07:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers

-0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others

Tango - Military abbreviation for MST
T - short form of 'Tango'

IANA/Olson: Reflects MST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems

America/Boise
America/Cambridge_Bay
America/Ciudad_Juarez
America/Creston
America/Dawson
America/Dawson_Creek
America/Denver
America/Edmonton
America/Fort_Nelson
America/Hermosillo
America/Inuvik
America/Mazatlan
America/Phoenix
America/Shiprock
America/Whitehorse
America/Yellowknife
Canada/Mountain
Canada/Yukon
MST
MST7MDT
Mexico/BajaSur
Navajo
US/Arizona
US/Mountain

Time zones with the GMT -7 offset:

MST - Mountain Standard Time
PDT - Pacific Daylight Time
YST - Yukon Standard Time
T - Tango Time Zone