Mountain Daylight Time

Frequently asked questions

Common questions about MDT, daylight saving, and how to handle it in software. Can't find what you need? Email [email protected].

How far apart can it feel when crossing into MDT from a neighboring zone?

Stepping from the Pacific zone into MDT means jumping an hour ahead, while moving east into Central Time adds another hour — a two-hour swing that can turn a short drive into a full schedule shift.

Why do some Canadian and Mexican cities share the same clock as Denver?

Because MDT spans three countries, cities like Edmonton, Cambridge Bay, and Ciudad Juárez align their daylight hours with Denver’s, making cross-border coordination simpler during the summer months.

Does MDT affect flight schedules across the Rockies?

Yes — airlines adjust departure and arrival times to match MDT, so travelers flying between mountain cities and coastal hubs often experience a one-hour time difference in both directions.

What’s unique about MDT in the far north, like Inuvik?

Inuvik uses MDT despite its extreme latitude, meaning summer days can stretch well past midnight — a surreal experience for visitors used to earlier sunsets.

How does MDT impact remote workers in the region?

Teams spread across MDT and neighboring zones often schedule meetings in the late morning to accommodate both mountain and central time colleagues without cutting into evening hours.

Is MDT always one hour ahead of Mountain Standard Time?

Exactly — when clocks spring forward in March, MST becomes MDT, shifting everything from school start times to TV prime time an hour later.

Do all MDT zones change their clocks on the same date?

Most do, following the U.S. and Canadian DST schedule, though Mexico’s Ciudad Juárez has occasionally used different transition dates in the past.

What happens to MDT when daylight saving ends?

In November, clocks fall back to Mountain Standard Time (MST), returning the region to UTC-07:00 and giving everyone an extra hour of sleep — at least for one night.