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?

MDT is used in the summer in these US states (MST during 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

MDT is used during summer in these Canadian provinces (MST during winter)

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

MDT is used during summer in these Mexican states (MST during winter)

• Baja California Sur
• Chihuahua
• Nayarit
• Sinaloa

Time zone maps are under development and will be available later

Example location in MDT

• Chihuahua - during summer

Other time zones in North America

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

• NST - Newfoundland Standard Time
• NDT - Newfoundland Daylight Time
• AST - Atlantic Standard Time
• ADT - Atlantic Daylight Time
• EST - Eastern Standard Time
• EDT - Eastern Daylight Time
• CST - Central Standard Time
• CDT - Central Daylight Time
• MST - Mountain Standard Time
• PST - Pacific Standard Time
• PDT - Pacific Daylight Time
• AKST - Alaska Standard Time
• AKDT - Alaska Daylight Time
• HAST - Hawaii-Aleutian Standard Time
• HADT - Hawaii-Aleutian Daylight Time

Time zones in other regions

• Australia
• Europe
• Military

More regions will be available later

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
• World Clock - North America - current time in North America