MDT time now |
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16:31:35 Sun, 6 Jul 2025
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| UTC Offset: UTC -6 |
Mountain Daylight Time (MDT) operates at UTC−6 and is the daylight saving counterpart to Mountain Standard Time (MST, UTC−7). Often simply referred to as "Mountain Time" during the summer months, MDT shifts clocks one hour forward to extend evening daylight. It is observed across parts of the western United States, western Canada, and a portion of northern Mexico, helping residents and businesses make better use of summer daylight hours.
Importance and Global Use of MDT
MDT supports economic and social activities by extending daylight into the evening during summer, benefiting industries such as tourism, agriculture, energy, and outdoor recreation across the Rocky Mountain region. This adjustment makes it easier for communities to plan events, travel, and services that rely on consistent and longer daylight after typical working hours.
Internationally, MDT helps synchronize schedules across North America, providing a predictable daylight saving shift between the Pacific and Central Time Zones. This consistency supports cross-border trade, transportation logistics, and digital services, ensuring smoother coordination between international partners working across multiple time zones.
Where and When MDT is used worldwide
North America
US states using MDT during summer and MST during winter:
- Arizona - Navajo Nation only InfoRest of the state follow MST all year.
- Colorado
- Idaho - all except northern counties InfoAll except Benewah, Bonner, Boundary, Clearwater, Kootenai, Latah, Lewis, Nez Perce, Shoshone, and north part of Idaho observe PST/PDT time zones.
- Kansas - few western counties onlyInfoGreeley, Hamilton, Sherman and Wallace
- Montana
- Nebraska - western counties InfoCounties are: Arthur, Banner, Box Butte, Chase, Cherry (west part), Cheyenne, Dawes, Deuel, Dundy, Garden, Grant, Hooker, Keith, Kimball, Morrill, Perkins, Scotts Bluff, Sheridan, and Sioux counties of Nebraska.
- New Mexico
- North Dakota - southwest counties only InfoThese southwest counties are: Adams, Billings, Bowman, Dunn (most), Golden Valley, Grant, Hettinger, McKenzie (south part), Mercer, Morton (most), Sioux (most), Slope, and Stark.
- Oregon - most of Malheur County only InfoRest of the state observe PST/PDT time zones.
- South Dakota - western counties only InfoWestern counties are: Bennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Jones (west part), Lawrence, Meade, Mellette, Pennington, Perkins, Shannon, Stanley (west part), Todd, and Ziebach.
- Texas - few western counties only InfoEl Paso, Hudspeth, and most part of Culberson counties
- Utah
- Wyoming
Canadian provinces and territories using MDT during summer and MST during winter:
- Alberta
- British Columbia - some southeastern communities Info Some southeastern communities near the Alberta border (including Cranbrook and Fernie).
- Northwest Territories - all except the community of Tungsten InfoThe community of Tungsten observe PST/PDT time zones.
- Nunavut - west of 102° West and all communities in the Kitikmeot Region
- Saskatchewan - Lloydminster and surrounding area only
Mexican states using MDT during summer and MST during winter:
Other Time Zones in UTC -6
Other time zones share the same offset as Mountain Daylight Time (MDT), but are known by different names. While their clocks align, they may represent different regions or countries based on local time zone definitions.