EST to MST Converter – Convert Eastern Time to Mountain Time

MST is 2 hours behind EST, so to convert mentally, subtract 2 hours to your EST time. For example: 9:00 AM EST = 7:00 AM MST. Our converter automatically adjusts for Daylight Saving Time so you always get the right result.

MST (Mountain Standard Time, UTC-7) is 2 hours behind EST (Eastern Standard Time, UTC-5) during standard time. For example, 9:00 AM EST = 7:00 AM MST. During DST periods, this difference changes by 1 hour when one or both zones observe Daylight Saving Time — our converter automatically applies the correct offset for any date you select.

The best overlap for standard business hours (9 AM–5 PM) in both zones is 11:00–17:00 EST = 09:00–15:00 MST. Schedule recurring calls in this window to keep both sides within normal working hours. Remember to re-check the window in March and November (or March/October for European zones) when DST transitions can shift the overlap by 1 hour.

Yes. EST (Eastern Standard Time) observes Daylight Saving Time. Clocks spring forward to EDT (UTC-4) on the second Sunday in March, and fall back to EST on the first Sunday in November. During the DST period, the difference with MST changes by 1 hour. Our converter always uses the current offset for the date you select.

Major cities in the EST (Eastern Standard Time, UTC-5) timezone include: New York, Boston, Miami, Atlanta, Washington DC, Philadelphia, Toronto. These cities switch to EDT (UTC-4) from the second Sunday in March to the first Sunday in November.

Major cities in the MST (Mountain Standard Time, UTC-7) timezone include: Denver, Salt Lake City, Calgary, Albuquerque, Boise. These cities switch to MDT (UTC-6) from the second Sunday in March to the first Sunday in November.

MST is 2 hours behind EST. The best overlap for business hours is 11:00–17:00 EST = 09:00–15:00 MST. Always include both local times in calendar invites (for example, "2:00 PM EST / 12:00 PM MST MST"). Double-check around March and November (or March/October for European zones) when DST transitions can shift the offset by 1 hour. For full scheduling guidance, see our international meeting times guide.