Also known as: MDST – Mountain Daylight Saving Time, NAMDT – North American Mountain Daylight Time
Mountain Daylight Time (MDT) is 6 hours behind Coordinated Universal Time (UTC). This time zone is a Daylight Saving Time time zone and is used in: North America.
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).
Where and When is MDT Observed?
North America
U.S. states using MDT in the summer and MST in the winter:
- Arizona - Navajo Nation only
- Colorado
- Idaho - most of the state except western counties
- Kansas - some western counties only
- Montana
- Nebraska - western counties
- New Mexico
- North Dakota - South-Western parts
- Oregon - parts of Malheur county only
- South Dakota - western counties
- Texas - a few counties in west
- Utah
- Wyoming
Canadian provinces/territories using MDT in the summer and MST in the winter:
- Alberta
- British Columbia - a few eastern communities
- 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:
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: