8 AM MST to EST
8 AM MST is 10 AM EST. The East Coast has been at work for an hour.
Add 2 hours to any Mountain time to get Eastern time. Check another time with the MST to EST converter.
If your shift is 8 AM to 4 PM MT that is 10 AM to 6 PM ET.
8 AM Mountain Time in Eastern Time
| Season & Location | Equivalent Time |
|---|---|
| Winter, Denver (MST to EST) | 10:00 AM EST |
| Summer, Denver (MDT to EDT) | 10:00 AM EDT |
| Phoenix in summer (MST to EDT) | 11:00 AM EDT |
| UTC in winter | 15:00 |
| UTC in summer | 14:00 |
Denver and New York always change clocks on the same day.
Working backwards? 10 AM EST is 8 AM MST. The EST to MST tool covers every other Eastern hour.
Nearby times
| Mountain Time (MST) | Eastern Time (EST) |
|---|---|
| 8:00 AM MST | 10:00 AM EST |
| 8:15 AM MST | 10:15 AM EST |
| 8:30 AM MST | 10:30 AM EST |
| 8:45 AM MST | 10:45 AM EST |
What 10 AM Eastern means
The East Coast workday started an hour ago. US stock markets opened at 9:30 AM Eastern. That is 7:30 AM Mountain so the first half hour of trading is already done. 8 AM Mountain is one of the easiest times for a call because both sides are fresh and New York lunch is still two hours away. Plan a longer slot with the Denver and New York meeting planner.
Arizona
Phoenix keeps MST all year. In winter 8 AM in Phoenix is 10 AM in New York. In summer it is 11 AM because only New York moves its clocks. Read more about Arizona time and EST.
Daylight saving time
Daylight saving time does not change this answer for Denver. MDT and EDT start and end on the same Sundays so 8 AM Mountain is 10 AM Eastern all year. See when daylight saving starts and ends.
8 AM MST to EST FAQ
When does the stock market open in Mountain Time?
The NYSE and Nasdaq open at 9:30 AM Eastern. That is 7:30 AM Mountain in winter and in summer.
What is 8 AM Phoenix time in Eastern Time?
It is 10 AM Eastern in winter. It is 11 AM Eastern in summer because Phoenix stays on MST while New York moves to EDT.
What is 10 AM EST in Mountain Time?
10 AM EST is 8 AM MST. Take 2 hours off the Eastern time.
Is 8 AM MDT also 10 AM in New York?
Yes. In summer Denver is on MDT and New York is on EDT. The gap stays 2 hours so 8 AM MDT is 10 AM EDT.
Later: 10 AM MST to EST. For every hour see the MST to EST time chart.
Related Tools & Time Zone Guides
Explore specialized converters and scheduling calculators for Mountain and Eastern Time.
Full Conversion Table
Browse all 24 hours side-by-side with 12h/24h toggle and day-shift markers.
Daylight Saving Time (DST) Rules
Check transition dates for 2024-2027 and MDT vs EDT rules.