EDT to MST Time Converter
MST is 2 hours behind EDT. EDT is UTC-4:00, and The US Mountain states are currently on MDT (UTC-6:00).
Best Time to Call Between EDT and MST
Both zones are inside normal business hours between 11:00 AM and 5:00 PM EDT — that's 9:00 AM to 3:00 PM MST. That's a 6-hour window.
both at work EDT only MST only neither — hours along the strip are EDT.
Common Times Converted
EDT on the left, MST on the right.
EDT to MST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| EDT | MST | Working hours |
|---|---|---|
| 12:00 AM | 10:00 PM prev day | — |
| 1:00 AM | 11:00 PM prev day | — |
| 2:00 AM | 12:00 AM | — |
| 3:00 AM | 1:00 AM | — |
| 4:00 AM | 2:00 AM | — |
| 5:00 AM | 3:00 AM | — |
| 6:00 AM | 4:00 AM | — |
| 7:00 AM | 5:00 AM | — |
| 8:00 AM | 6:00 AM | — |
| 9:00 AM | 7:00 AM | EDT only |
| 10:00 AM | 8:00 AM | EDT only |
| 11:00 AM | 9:00 AM | Both zones |
| 12:00 PM | 10:00 AM | Both zones |
| 1:00 PM | 11:00 AM | Both zones |
| 2:00 PM | 12:00 PM | Both zones |
| 3:00 PM | 1:00 PM | Both zones |
| 4:00 PM | 2:00 PM | Both zones |
| 5:00 PM | 3:00 PM | MST only |
| 6:00 PM | 4:00 PM | MST only |
| 7:00 PM | 5:00 PM | — |
| 8:00 PM | 6:00 PM | — |
| 9:00 PM | 7:00 PM | — |
| 10:00 PM | 8:00 PM | — |
| 11:00 PM | 9:00 PM | — |
What EDT and MST Actually Are
EDT — Eastern Daylight Time
New York, Toronto, Washington DC, Atlanta, Miami, Boston. Standing at UTC-4:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to EST.
EDT runs from the second Sunday in March to the first Sunday in November — about eight months, making the "daylight" version the majority of the year rather than the exception.
MST — Mountain Standard Time
Denver, Salt Lake City, Calgary — and Phoenix year-round. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST. Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.
Arizona has stayed on MST year-round since 1968 — the Navajo Nation within it does observe daylight saving, making the state a patchwork.
What This Means in Practice
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Close enough to share a working day
At only 2 hours apart, the two working days overlap almost completely. Scheduling is barely constrained by the difference.
Major Cities in Each Zone
Cities on EDT
Cities on MST
Frequently Asked Questions
What is the time difference between EDT and MST?
MST is 2 hours behind EDT. That is the live figure. Taken strictly as written, the gap between EDT and MST is 3 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM EDT in MST?
9:00 AM EDT is 7:00 AM MST.
What are the best hours to schedule a call between EDT and MST?
Between 11:00 AM and 5:00 PM EDT, which is 9:00 AM to 3:00 PM MST. Both sides are inside normal business hours through that window.
Does the difference between EDT and MST change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, November 1, 2026.
Does MST always mean Mountain Standard Time?
Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.