Also known as: Mountain Time (MT) and Mountain Standard Time (MST)

Time zone map of MDT
Currently observing MDT.
Areas with same time currently (UTC -6).
Currently observing MDT – Mountain Daylight Time.
Currently has same time zone offset as MDT (UTC -6) but different time zone name.

Mountain Daylight Time (MDT) is 6 hours behind Coordinated Universal Time (UTC). This time zone is a Daylight Saving Time time zone and is used in: North America.

See full time zone map

What Is Mountain Daylight Time?

Mountain Daylight Time is the second westernmost time zone in the United States and Canada. It is also used in Mexico.

It covers all or parts of 13 states in the US and five provinces or territories in Canada.

The MST time zone is the least populated time zone in the USA. It spans from northern Canada to Mexico.

In North America, Mountain Daylight Time shares a border with Central Daylight Time (CDT) in the east and with Pacific Daylight Time (PDT) in the west.

MDT or MST?

Mountain Daylight Time (MDT) is a North American time zone in use from the second Sunday in March to the first Sunday in November during Daylight Saving Time (DST). Mountain Standard Time (MST) is used during the remainder of the year.

MDT Is the Mountain Time Zone

In everyday usage, MDT is often referred to as Mountain Time (MT) or the Mountain Time Zone. This can add a bit of confusion as the term Mountain Time does not differentiate between standard time and Daylight Saving Time, so Mountain Time switches between MST and MDT in areas that use DST during part of the year.

Most North American time zones also have generic terms, including Pacific Time (PT), Central Time (CT), Eastern Time (ET), and Atlantic Time (AT).

Converting Mountain Time to Other US Time Zones

  • Mountain Daylight Time (MDT) is 2 hours behind Eastern Daylight Time (EDT).
    To convert MDT to EDT, you have to add two hours.
  • Mountain Daylight Time (MDT) is 1 hour behind Central Daylight Time (CDT).
    To convert MDT to CDT, you have to add one hour.
  • Mountain Daylight Time (MDT) is 1 hour ahead of Pacific Daylight Time (PDT).
    To convert MDT to PDT, you have to subtract one hour.

Time Zone Converter: UTC to MDT

Where and When is MDT Observed?

North America

US states using MDT in the summer and MST in the winter:

  • Arizona - Navajo Nation only
  • Colorado
  • Idaho - most of the state except western counties Show

    Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho

  • Kansas - some western counties only Show

    Greeley, Hamilton, Sherman and Wallace

  • Montana
  • Nebraska - western counties Show

    Arthur, Banner, Box Butte, Chase, Cheyenne, Dawes, Deuel, Dundy, Garden, Grant, Hooker, Keith, Kimball, Morrill, Perkins, Scotts Bluff, Sheridan, and Sioux and the western part of Cherry

  • New Mexico
  • North Dakota - South-Western parts Show

    counties of Adams, Billings, Bowman, Golden Valley, Grant, Hettinger, Mercer, Slope and Stark, and southern parts of Dunn and McKenzie, most of Morton and Sioux counties

  • Oregon - parts of Malheur county only Show

    rest of Oregon is PST/PDT

  • South Dakota - western counties Show

    Bennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Lawrence, Meade, Pennington, Perkins, Shannon, and Ziebach, and the western parts of Stanley

  • Texas - a few counties in west Show

    El Paso and Hudspeth and part of Culberson

  • Utah
  • Wyoming

Canadian provinces/territories using MDT in the summer and MST in the winter:

  • Alberta
  • British Columbia - a few eastern communities Show

    Cranbrook, Golden, Invermere

  • Northwest Territories
  • Nunavut - Kugluktuk, Cambridge Bay only (Other parts use EST/EDT or EST only)
  • Saskatchewan - only Lloydminster

Mexican states using MDT in the summer and MST in the winter:

  • Baja California Sur
  • Chihuahua
  • Nayarit
  • Sinaloa

Other Time Zones in UTC -6

Some time zones exist that have the same offset as MDT, but can be found under a different name:

  • CST – Central Standard Time
  • EAST – Easter Island Standard Time
  • GALT – Galapagos Time
  • S – Sierra Time Zone
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MDT time now

00:00:00

Showing 24 hour format.

UTC – Coordinated

Universal Time is the common time standard across the world.

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