12am in Eastern Daylight Time is 10pm in Mountain Daylight Time on the previous day.

Frequently asked

Quick answers about converting between Eastern Daylight Time and Mountain Daylight Time. Can't find what you need? Email [email protected].

What is the time difference between Eastern Daylight Time and Mountain Daylight Time?

Eastern Daylight Time is 2 hours ahead of Mountain Daylight Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 12am in Eastern Daylight Time, what time is it in Mountain Daylight Time?

12am in Eastern Daylight Time is 10pm in Mountain Daylight Time on the previous day. It lands deep outside working hours in Mountain Daylight Time — see the best time to meet below for a friendlier slot. Use the hour-by-hour table above to read any other time across.

What's the best time for a call between Eastern Daylight Time and Mountain Daylight Time?

11am–5pm in Eastern Daylight Time lines up with 9am–3pm in Mountain Daylight Time — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — EDT and MDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.