EST to MST converter

Enter an Eastern time and see it in Mountain for that exact date, with the Arizona exception explained.

⇆ MST to EST

Converted time

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Original—
Difference—
UTC—

Every hour of the day, EST to MST

Two hours for Denver; Phoenix needs its own conversion because it never changes. Change the date above and this table follows it.

Need a different pair?

This page is fixed to Eastern Time and Mountain Time. For any other two places, or to see every US zone and world city at once, use the full time zone converter — it covers 97 cities, flags daylight-saving gaps, and includes a meeting planner.

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Subtract two hours — for most of the Mountain zone

Eastern to Mountain takes off two hours for Denver, Salt Lake City, Albuquerque, Boise and Cheyenne. Those cities change their clocks on the same Sundays as the East Coast, so the two-hour gap is stable all year.

Eastern time − 2 hours = Mountain time (Denver, not Phoenix)

Phoenix needs its own arithmetic

Arizona keeps UTC−7 permanently. Since Eastern moves between UTC−5 and UTC−4, the difference from New York to Phoenix is two hours in winter and three in summer. Anyone scheduling with Arizona from the East Coast should convert by city, not by zone name. From roughly March to November, Phoenix is on the same clock as Los Angeles.

A workable but back-loaded overlap

An East Coast morning is a Mountain early morning: 8:00 AM in New York is 6:00 AM in Denver. The comfortable window opens around 11:00 AM Eastern, which is 9:00 AM Mountain, and runs to about 5:00 PM Eastern. National deadlines quoted in Eastern land two hours earlier in local terms, so a midnight Eastern cut-off is 10:00 PM in Denver, still the same evening.

Where the Mountain zone reaches

It covers Colorado, Utah, Wyoming, Montana, New Mexico, most of Idaho and Arizona, plus slices of Texas, Kansas, Nebraska, North Dakota and South Dakota. El Paso runs on Mountain despite the rest of Texas being Central.

Frequently asked questions

What time is 2 PM EST in MST?
Noon in Denver. In Phoenix it is noon in winter but 11:00 AM during daylight saving, because Arizona does not shift.
Why is Arizona different?
Arizona opted out of daylight saving, so it stays at UTC−7 all year while the rest of the country moves around it.
Is Denver always two hours behind New York?
Yes. Both observe daylight saving on the same dates, so the two-hour difference holds throughout the year.
What is midnight Eastern in Mountain time?
10:00 PM on the same evening in Denver, which is why Eastern-quoted deadlines expire earlier than they read.

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Guides & articles

conversionUS Time Zones Explained: EST, CST, MST, PST and UTC6 min read