North American time zones:

MDT – Mountain Daylight Time

Time zone offset: UTC - 6 hours

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

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).

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

Example location in MDT

• Chihuahua - during summer

Other time zones in North America

• 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

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