MST is 2 hours behind EST all year. So 12:00 PM EDT = 10:00 AM MDT. (Eastern Time is on EDT and Mountain Time is on MDT for daylight saving time right now.)
EST to MST conversion table
| EST / EDT | MST / MDT |
|---|---|
| 12:00 AM | 10:00 PM −1 day |
| 1:00 AM | 11:00 PM −1 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 |
| 10:00 AM | 8:00 AM |
| 11:00 AM | 9:00 AM |
| 12:00 PM | 10:00 AM |
| 1:00 PM | 11:00 AM |
| 2:00 PM | 12:00 PM |
| 3:00 PM | 1:00 PM |
| 4:00 PM | 2:00 PM |
| 5:00 PM | 3:00 PM |
| 6:00 PM | 4:00 PM |
| 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 |
EST and MST difference through 2027
The gap between the two zones on each date range, including daylight saving time changes:
| Dates | Eastern Time | Mountain Time | Difference |
|---|---|---|---|
| Sep 30, 2026 – Oct 31, 2026 | EDT (UTC−4) | MDT (UTC−6) | MST 2 hours behind |
| Nov 1, 2026 – Mar 13, 2027 | EST (UTC−5) | MST (UTC−7) | MST 2 hours behind |
| Mar 14, 2027 – Nov 6, 2027 | EDT (UTC−4) | MDT (UTC−6) | MST 2 hours behind |
| Nov 7, 2027 – Dec 31, 2027 | EST (UTC−5) | MST (UTC−7) | MST 2 hours behind |
Best time to meet or call
- Working hours (9 AM–5 PM) overlap from 11:00 AM–5:00 PM EST (9:00 AM–3:00 PM MST), about 6 hours.
About Eastern Time (EST)
The Eastern time zone uses EST (UTC−5) in winter and EDT (UTC−4) during daylight saving time, from the second Sunday in March to the first Sunday in November. It's used in New York, Washington DC, Boston, Atlanta, Miami, Detroit and Toronto.
About Mountain Time (MST)
Mountain Time uses MST (UTC−7) in winter and MDT (UTC−6) in summer. Most of Arizona stays on MST all year and does not change its clocks. It's used in Denver, Salt Lake City, Albuquerque, Boise, El Paso and Calgary.
Frequently asked questions
What time is 12 PM EST in MST?
12:00 PM EDT is 10:00 AM MDT.
How many hours ahead or behind is MST from EST?
MST is 2 hours behind EST, all year.
Does EST change for daylight saving time?
Yes. The Eastern time zone uses EST (UTC−5) in winter and EDT (UTC−4) during daylight saving time, from the second Sunday in March to the first Sunday in November.
Does MST change for daylight saving time?
Yes. Mountain Time uses MST (UTC−7) in winter and MDT (UTC−6) in summer. Most of Arizona stays on MST all year and does not change its clocks.
What is the best time for a call between EST and MST?
Right now, working hours overlap from 11:00 AM–5:00 PM EST (9:00 AM–3:00 PM MST), about 6 hours.
Is it EST or EDT right now?
Eastern Time uses EST in winter and EDT from the second Sunday in March to the first Sunday in November. The live clock on this page shows which one applies today.
More time zone conversions
- MST to EST (reverse)
- EST to PST
- EST to CST
- PST to MST
- CST to MST
- EST to IST
- EST to GMT
- EST to UTC
- EST to CET
- All time zones
Sources
Reviewed by Gurmej Singh, Founder, Divy Digital Hub · Last reviewed: Wednesday, September 30, 2026. All calculations run in your browser. Editorial policy.