About MST to EST Time
MST covers Denver, Salt Lake City, Albuquerque and Calgary. EST covers New York, Toronto, Atlanta, Miami and Boston.
Working days overlap between 09:00 and 16:00 MST, which is 11:00–18:00 in EST. That window is where calls land without anyone working late.
Both regions use daylight saving, so the gap holds for most of the year — except for the week or two each spring and autumn when they switch on different dates.
How it works
Eastern Time (New York) is always 2 hours ahead of Mountain Time (Denver).
- Take the MST time you want to convert.
- Add 2 hours.
- Roll the date forward or back if the result crosses midnight.
Neither side changes its clocks relative to the other, so this gap holds all year.
Zone details: MST is −7 in winter and −6 in summer (UTC), EST is −5 in winter and −4 in summer.
Examples
A working day in MST, seen from EST:
| MST | EST |
|---|---|
| 09:00 MST | 11:00 EST |
| 12:00 MST | 14:00 EST |
| 15:00 MST | 17:00 EST |
| 18:00 MST | 20:00 EST |
| 21:00 MST | 23:00 EST |
Meetings usually work best where the two working days overlap. Drag the timeline above to see the overlap for any hour, or use the full time zone converter for any other pair of cities.
MST to EST Time: frequently asked questions
- What is the time difference between MST and EST?
- EST is 2 hours ahead of MST in standard time (MST is UTC−7, EST is UTC−5). Both zones change clocks on the same US dates, so the 2 hours difference stays the same all year — except in Arizona, which stays on MST year-round.
- What is 9 AM MST in EST?
- 9:00 AM MST is 11:00 AM EST (standard time).
- Where is MST used?
- Mountain Standard Time (UTC−7) is used in the US Mountain (Denver, Phoenix).
- Where is EST used?
- Eastern Standard Time (UTC−5) is used in US East Coast (New York, Miami).