timeinusa.net

EST to MST — Eastern to Mountain Time

Mountain Time is 2 hours behind Eastern Time, in every month of the year.

The conversion rule

Subtract 2 hours from Eastern Time to get Mountain Time. 12:00 PM EST is 10:00 AM MST. Denver and New York change to daylight saving on the same two dates, so the gap never moves.

For meetings, aim for 11:00 AM–5:00 PM ET / 9:00 AM–3:00 PM MT — a six-hour stretch inside office hours in both zones. The reverse of an 8:00 AM ET start is a 6:00 AM alarm in Denver; skip it.

One exception to watch: Arizona (Phoenix, Tucson) stays on MST all year, so from March to November it is 3 hours behind the East Coast — its clocks then read the same as Pacific Daylight Time.

EST to MST conversion chart

Eastern (EST/EDT)Mountain (MST/MDT)
12:00 AM (midnight)10:00 PM (prev. day)
1:00 AM11:00 PM (prev. day)
2:00 AM12:00 AM (midnight)
3:00 AM1:00 AM
4:00 AM2:00 AM
5:00 AM3:00 AM
6:00 AM4:00 AM
7:00 AM5:00 AM
8:00 AM6:00 AM
9:00 AM7:00 AM
10:00 AM8:00 AM
11:00 AM9:00 AM
12:00 PM (noon)10:00 AM
1:00 PM11:00 AM
2:00 PM12:00 PM (noon)
3:00 PM1:00 PM
4:00 PM2:00 PM
5:00 PM3:00 PM
6:00 PM4:00 PM
7:00 PM5:00 PM
8:00 PM6:00 PM
9:00 PM7:00 PM
10:00 PM8:00 PM
11:00 PM9:00 PM

Reverse direction: MST to EST (add 2 hours). Related: EST to CST, EST to PST, EST to AKST.

Frequently asked questions

Is Mountain Time always 2 hours behind Eastern?

For Denver, Salt Lake City, and the rest of the DST-observing Mountain zone, yes — both zones shift on the same dates. Arizona is the exception: it skips DST, so Phoenix is 2 hours behind Eastern in winter but 3 hours behind in summer.

What is 5:00 PM EST in MST?

3:00 PM MST. End of business in New York is mid-afternoon in Denver, with two working hours left in the Mountain day.

What time is a 1:00 PM ET kickoff in Mountain Time?

11:00 AM MT. Sunday early-window NFL games kick off before noon in Denver.