Home > Time Zones > Abbreviations > MDT – Mountain Daylight Time

MDT – Mountain Daylight Time (Daylight Saving Time)

Also known as: MDST – Mountain Daylight Saving Time, NAMDT – North American Mountain Daylight Time

Mountain Daylight Time Note:

North America: MDT is currently not observed since DST isn't active. Locations are currently observing MST instead.

No locations currently on MDT.
Observes MDT part of the year.
Areas with same time currently (UTC -6:00).
No locations are currently on MDT – Mountain Daylight Time.
Observes MDT – Mountain Daylight Time part of the year, but not currently.
Currently has same time zone offset as MDT (UTC -6:00) but different time zone name.

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

This time zone is often called Mountain Daylight Time.

See full time zone map

Winter Time & DST

This time zone is a daylight saving/summer time zone, in the winter some places will switch to the corresponding standard time zone: MST (Mountain Standard Time).

Email time zone indicator: -0600

An email sent from someone in the Mountain Daylight Time (MDT) time zone will have the time zone listed as "-0600" in the headers of the email. (However, "-0600" does not have to be in Mountain Daylight Time, as other time zones could have the same UTC offset).

Where and when is MDT observed?

North America

U.S. 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, Mellette, Pennington, Perkins, Shannon, Todd, and Ziebach, and the western parts of Jones and Stanley

  • Texas - a few counties in west Show

    El Paso and Hudspeth and part of Culberson

  • Utah
  • Wyoming

Canadian provinces and 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

No locations currently on MDT

  • UTC Offset: UTC -6:00

Find current time and time zone by city


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Other names

HAR – Heure Avancée des Rocheuses (French)

Example cities

Canada – Edmonton (Summer)

Related time zones

MST – Mountain Standard Time (Standard Time)


Time Zone Map with DST

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