North American time zones:

MDT – Mountain Daylight Time

Time zone offset: UTC - 6 hours

MDT is 6 hours behind of Coordinated Universal Time (UTC)

Note that MDT is a daylight saving time/summer time zone. It is generally only used during the summer in the places listed below, during the winter MST is used instead

Time zone abbreviations: MDT, HAR

Full name is Mountain Daylight Time
HAR – Heure Avancée des Rocheuses (French)

Email time zone indicator: -0600

An email sent from someone in the 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 MDT, as other time zones could have the same UTC offset).

For actual dates DST might be observed, look at the examples below

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Where and when is MDT observed?

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

• Arizona - Navajo Nation only
• Colorado
• Idaho - most of the state except western counties
  Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone and north part of Idaho
• Kansas - some western counties only
  Greeley, Hamilton, Sherman and Wallace
• Montana
• Nebraska - western counties
  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
  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
  rest of Oregon is PST/PDT
• South Dakota - western counties
  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
  El Paso and Hudspeth and part of Culberson
• Utah
• Wyoming

Canadian provinces using MDT in the summer and MST during the winter

• Alberta
• British Columbia - a few eastern communities
  Cranbrook, Golden, Invermere
• Northwest Territories
• Saskatchewan - only Lloydminster

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

• Baja California Sur
• Chihuahua
• Nayarit
• Sinaloa

Time zone maps are under development and will be available later

Example location in MDT

• Edmonton - This time zone offset is used during summer in this location

Other time zones in North America

Go directly through the links below, or see the North America time zone list

• ADT - Atlantic Daylight Time
• AKDT - Alaska Daylight Time
• AKST - Alaska Standard Time
• AST - Atlantic Standard Time
• CDT - Central Daylight Time
• CST - Central Standard Time
• EDT - Eastern Daylight Time
• EGST - Eastern Greenland Summer Time
• EGT - East Greenland Time
• EST - Eastern Standard Time
• HADT - Hawaii-Aleutian Daylight Time
• HAST - Hawaii-Aleutian Standard Time
• MST - Mountain Standard Time
• NDT - Newfoundland Daylight Time
• NST - Newfoundland Standard Time
• PDT - Pacific Daylight Time
• PMDT - Pierre & Miquelon Daylight Time
• PMST - Pierre & Miquelon Standard Time
• PST - Pacific Standard Time
• WGST - Western Greenland Summer Time
• WGT - West Greenland Time

Time zones in other regions

• Africa
• Antarctica
• Asia
• Atlantic
• Australia
• Caribbean
• Central America
• Europe
• Indian Ocean
• Military
• Pacific
• South America

Related links

• Time zone abbreviations world-wide
• The World Clock - Time Zones - current time around the world
• The World Clock - Time Zone Converter - Convert between time zones