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Specific time, zone to zone

12:00 pm EST to MST — 10:00 am MST

12:00 pm Eastern Time (EST) is 10:00 am Mountain Time (MST) while both regions are on standard time. Neither zone changes this result during the year, so the same answer holds in January and in July.

Standard time

10:00 am

Applies while neither zone is on daylight saving — broadly November to March in the northern hemisphere.

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How the two zones line up

Eastern Time runs at UTC−5 in winter and UTC−4 in summer. Mountain Time runs at UTC−7 and UTC−6 respectively. Take the difference between the two, add it to 12:00 pm, and you get the local time on the other side.

Daylight saving

Neither zone changes its offset relative to the other during the year, so this conversion is stable in every month.

Where this conversion gets used

  • Coast-to-coast conference calls
  • all-hands scheduling
  • market open times
  • customer support shifts
  • flight connections

EST to MST — every hour

Both columns are computed from the IANA database, so they follow the real transition dates.

ESTMST — standard
12:00 am10:00 pm (previous day)
1:00 am11:00 pm (previous day)
2:00 am12:00 am
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 pm10:00 am
1:00 pm11:00 am
2:00 pm12:00 pm
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

Questions people ask

10:00 am MST. The gap between the two zones does not change during the year, so this holds all year.

Related conversions

10:00 am EST to MST11:00 am EST to MST1:00 pm EST to MST2:00 pm EST to MST

All conversions →

Booking something recurring?

A fixed clock time drifts when either side changes its clocks. Our guides explain how to stop that happening.

Read the DST guidePlan a meeting