MDT – Mountain Daylight Time (Daylight Saving Time)
Also known as: MDST – Mountain Daylight Saving Time, NAMDT – North American Mountain Daylight Time
North America: MDT is currently not observed because locations are on standard time and are observing MST.
Please use the search field on the right to find the correct local time in any city.
This time zone is often called Mountain Daylight Time.
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?
U.S. states using MDT in the summer and MST in the winter:
- Arizona - Navajo Nation only
- 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
- 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
- South Dakota - western counties
Bennett, Butte, Corson, Custer, Dewey, Fall River, Haakon, Harding, Jackson, Lawrence, Meade, Pennington, Perkins, Shannon, and Ziebach, and the western parts of Stanley
- Texas - a few counties in west
El Paso and Hudspeth and part of Culberson
Canadian provinces/territories using MDT in the summer and MST in the winter:
- British Columbia - a few eastern communities
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
Other Time Zones in UTC -6
Some time zones exist that have the same offset as MDT, but can be found under a different name:
No locations currently on MDT
Find current time and time zone by city
HAR – Heure Avancée des Rocheuses (French)
Canada – Edmonton (Summer)
Related time zones
MST – Mountain Standard Time (Standard Time)
Time Zone Map with DST
Time zones by continent/region
- Central America
- Indian Ocean
- North America
- South America