Mountain Daylight Time (MDT)
MDT is UTC-6. Current Mountain Time (US & Canada) and when MDT applies.
Mountain Time (US & Canada) now
--:--:--
Tuesday, November 3, 2026
MSTUTC-7
Mountain Time is on MST right now, not MDT
Exact MDT (UTC-6) time now: --:--:--
About MDT
- Full Name
- Mountain Daylight Time
- Abbreviation
- MDT
- UTC Offset
- UTC-6
- Mountain Time is on
- Standard Time (MST)
- Daylight Saving Time
- Mountain Time: Starts Mar 14, 2027 · switches between MST and MDT
Mountain Daylight Time (MDT) is UTC-6. It is used on Mountain Time from the second Sunday in March to the first Sunday in November. Arizona (except the Navajo Nation), Yukon, Sonora and several other Mexican states do not use MDT and stay on UTC-7 all year.
Where MDT is used
Switches between MST and MDT
- Denver, Salt Lake City, Albuquerque, Boise and most of the Mountain West, United States
- Alberta, the Northwest Territories and southeastern British Columbia, Canada (Calgary, Edmonton, Yellowknife)Lloydminster, which straddles the Alberta–Saskatchewan border, also follows this time.
- Ciudad Juárez, Chihuahua, MexicoFollows US daylight saving dates.
Major Cities in Mountain Time
Denver--:--MSTEdmonton--:--MDTAlbuquerque--:--MSTAurora--:--MSTBoise--:--MSTColorado Springs--:--MSTEl Paso--:--MSTSalt Lake City--:--MSTEach city shows its own current abbreviation, so places on daylight saving time are labelled accordingly.
MDT vs Other Time Zones
| Comparison | By definition | Right now (local clocks) |
|---|---|---|
| MDT to MST | -1 hour | Same region |
| MDT to PDT | -1 hour | -1 hour |
| MDT to CDT | +1 hour | +1 hour |
| MDT to EDT | +2 hours | +2 hours |
| MDT to UTC | +6 hours | +7 hours |
“By definition” compares the fixed offsets of the abbreviations. “Right now” compares the actual local time in each region today, including daylight saving time.
MDT FAQs
What is MDT?
Mountain Daylight Time (MDT) is UTC-6. It is used on Mountain Time from the second Sunday in March to the first Sunday in November. Arizona (except the Navajo Nation), Yukon, Sonora and several other Mexican states do not use MDT and stay on UTC-7 all year.
What is the UTC offset of MDT?
MDT is always UTC-6. When Mountain Time is not on daylight saving time, it uses MST (UTC-7) instead.
Is it MDT or MST right now?
Mountain Time is on MST right now, not MDT. MST is UTC-7, 1 hour behind MDT (UTC-6). Mountain Time switches to MDT on Sunday, March 14, 2027 at 2:00 AM.
When does Mountain Time switch between MST and MDT?
In 2026, Mountain Time switches to MDT on Sunday, March 8, 2026 at 2:00 AM (clocks go forward 1 hour) and back on Sunday, November 1, 2026 at 2:00 AM (clocks go back 1 hour).
Is MDT used all year anywhere?
No major region uses MDT all year. It is only in effect during daylight saving time; the rest of the year the same places use MST.