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BlogHow it works

MST to EST Converter

Choose a Mountain Time hour to read the Eastern Time in New York, Atlanta or Miami. The converter tracks Denver, which shares the US daylight saving dates with the East Coast.

Mountain Time

MSTMountain Time

ESTEastern Time

––:––

Add 2 hours to a Denver time to get New York time. For Phoenix in summer, add 3.

Mountain to Eastern hour table

MST timeEST/EDT time
12:00 AM2:00 AM
1:00 AM3:00 AM
2:00 AM4:00 AM
3:00 AM5:00 AM
4:00 AM6:00 AM
5:00 AM7:00 AM
6:00 AM8:00 AM
7:00 AM9:00 AM
8:00 AM10:00 AM
9:00 AM11:00 AM
10:00 AM12:00 PM
11:00 AM1:00 PM
12:00 PM2:00 PM
1:00 PM3:00 PM
2:00 PM4:00 PM
3:00 PM5:00 PM
4:00 PM6:00 PM
5:00 PM7:00 PM
6:00 PM8:00 PM
7:00 PM9:00 PM
8:00 PM10:00 PM
9:00 PM11:00 PM
10:00 PM12:00 AM+1 next day
11:00 PM1:00 AM+1 next day
Each Mountain Time hour with the Eastern Time beside it. Late-evening rows in Denver are already the next day in New York (+1).

Two zones with the same rules

Mountain Time is UTC−7 in winter and UTC−6 in summer; Eastern Time is UTC−5 and UTC−4. Both follow the federal daylight saving schedule set by the Energy Policy Act of 2005 and overseen by the US Department of Transportation: forward on the second Sunday of March, back on the first Sunday of November, at 2:00 AM local time.

Because the East Coast changes two hours earlier in real time, the gap is briefly 3 hours on the March change night and 1 hour on the November one, for two hours in the small hours. For any normal meeting, the answer is 2 hours.

The Arizona exception

Most of Arizona keeps Mountain Standard Time all year and skips daylight saving. In winter, Phoenix and Denver read the same and both are 2 hours behind New York. From March to November, Phoenix stays on UTC−7 while New York moves to UTC−4, so the gap grows to 3 hours.

The Navajo Nation in northeastern Arizona does observe daylight saving, so it follows Denver. When a contact gives Arizona as the location, ask which town.

Easy parts

  • The Denver and New York workdays overlap for six hours.
  • Both zones change on the same dates, so recurring meetings stay put.
  • Early Mountain mornings catch the East Coast at mid-morning.

Things to watch

  • New York closes at 5:00 PM, which is only 3:00 PM in Denver.
  • Arizona contacts shift by an hour every spring and fall.
  • TV and live events listed in ET air 2 hours earlier on the Mountain clock.

The Denver and Washington, DC clocks show both zones now. Going the other way, use EST to MST; for the Central zone in between, see MST to CST.

MST to EST questions

How many hours is Eastern Time ahead of Mountain Time?

Eastern Time is 2 hours ahead of Mountain Time. Noon in Denver is 2:00 PM in New York.

Is Phoenix 2 or 3 hours behind New York?

2 hours in winter and 3 hours from March to November, because most of Arizona does not use daylight saving.

What is 7:00 AM MST in EST?

7:00 AM Mountain Time is 9:00 AM Eastern Time.

When should a Denver team call New York?

Before 3:00 PM in Denver, which is 5:00 PM in New York. After that the East Coast office is closing.

Do MST and EST switch to daylight time together?

Yes. Both move at 2:00 AM local time on the same Sundays in March and November, so the 2-hour gap holds.