When does MDT begin and end each year?

MDT begins on the second Sunday in March when clocks spring forward one hour from MST, and concludes on the first Sunday in November when clocks return to standard time.

What major metropolitan areas observe MDT?

Cities observing MDT during summer include Denver, Salt Lake City, Boise, Albuquerque, Calgary, and Edmonton.

Is MDT the same time as Central Standard Time (CST)?

Yes. Both MDT and CST share the identical UTC-6 offset. MDT applies during summer in the Mountain zone, while CST applies during winter in the Central zone.

When does MDT begin and end each year?

MDT begins on the second Sunday in March when clocks spring forward one hour from MST, and concludes on the first Sunday in November when clocks return to standard time.

What major metropolitan areas observe MDT?

Cities observing MDT during summer include Denver, Salt Lake City, Boise, Albuquerque, Calgary, and Edmonton.

Is MDT the same time as Central Standard Time (CST)?

Yes. Both MDT and CST share the identical UTC-6 offset. MDT applies during summer in the Mountain zone, while CST applies during winter in the Central zone.

UTC -6MDTDST Active (Summer Time)

Mountain Daylight Time (MDT) Clock

What time is it in MDT right now? Live Mountain Daylight Time clock with seconds, UTC-6 offset, Denver and Salt Lake City tech hours, and DST dates.

10:23:31 AMMDT

Saturday, October 10, 2026

Day 283 of 2026 • Week 41

Your location vs this zone: 6 hours behind.

Convert time

Major Cities in this Zone

Live synchronized clocks

Dedicated Timezone Analysis

Live Mountain Daylight Time (UTC-6) Reference

Mountain Daylight Time (MDT, UTC-6) governs the Rocky Mountain corridor of the United States and Canada from March through November. Home to Silicon Slopes in Utah, aerospace hubs in Colorado, and energy headquarters in Alberta, MDT provides a key bridge between the Midwest and Pacific tech centers.

Our live clock synchronizes with atomic time servers to show running seconds without lag, making cross-country call scheduling and travel logistics effortless.

NIST Atomic Time Standards in Boulder, Colorado

Observances, offset conventions, and international coordination for Mountain Daylight Time (MDT).

Intermountain Tech Hubs and Regional Collaboration

Observances, offset conventions, and international coordination for Mountain Daylight Time (MDT).

Timezone Specifications & Offset Anchors

Civil OffsetUTC -6

Primary IANA IDAmerica/Denver

Daylight SavingObserves Seasonal DST

Interactive MapView on World Map →

Frequently Asked Questions: Mountain Daylight Time (MDT) Clock

Common queries, time calculations, and scientific explanations

Google SERP Verified

Mountain Daylight Time (MDT) is the summer daylight saving schedule for the Rocky Mountain region, anchored to UTC-6 (6 hours behind Coordinated Universal Time).