Complete 24-Hour Schedule Reference

MST to EST Time Chart: Every Hour

Quickly look up any hour from Mountain Time (MST/MDT) to Eastern Time (EST/EDT) with our live Mountain to Eastern converter. Features 12h and 24h formats, date rollover alerts, and business hour overlap highlighting.

⚠️ Critical Date Rollover Rule (Next Day in EST)

10:00 PM – 11:59 PM MST Rolls Over to the Next Day in EST

Because Eastern Time is 2 hours ahead, any time in Mountain Time from 10:00 PM (22:00) through 11:59 PM (23:59) crosses the midnight threshold into the next calendar day in Eastern Time. For example, Monday 10:00 PM MST is Tuesday 12:00 AM Midnight EST, and Monday 11:00 PM MST is Tuesday 1:00 AM EST.

24-Hour Conversion Table

Complete hourly mapping between Mountain Time (MST/MDT) and Eastern Time (EST/EDT).

View:

Mountain Time (MST/MDT)	Difference	Eastern Time (EST/EDT)	Status
12:00 AMMST/MDT	+2 Hours →	2:00 AMEST/EDT	Night
1:00 AMMST/MDT	+2 Hours →	3:00 AMEST/EDT	Night
2:00 AMMST/MDT	+2 Hours →	4:00 AMEST/EDT	Night
3:00 AMMST/MDT	+2 Hours →	5:00 AMEST/EDT	Night
4:00 AMMST/MDT	+2 Hours →	6:00 AMEST/EDT	Night
5:00 AMMST/MDT	+2 Hours →	7:00 AMEST/EDT	Morning
6:00 AMMST/MDT	+2 Hours →	8:00 AMEST/EDT	Morning
7:00 AMMST/MDT	+2 Hours →	9:00 AMEST/EDT	Partial Working
8:00 AMMST/MDT	+2 Hours →	10:00 AMEST/EDT	Partial Working
9:00 AMMST/MDT	+2 Hours →	11:00 AMEST/EDT	Business Overlap
10:00 AMMST/MDT	+2 Hours →	12:00 PMEST/EDT	Business Overlap
11:00 AMMST/MDT	+2 Hours →	1:00 PMEST/EDT	Business Overlap
12:00 PMMST/MDT	+2 Hours →	2:00 PMEST/EDT	Business Overlap
1:00 PMMST/MDT	+2 Hours →	3:00 PMEST/EDT	Business Overlap
2:00 PMMST/MDT	+2 Hours →	4:00 PMEST/EDT	Business Overlap
3:00 PMMST/MDT	+2 Hours →	5:00 PMEST/EDT	Partial Working
4:00 PMMST/MDT	+2 Hours →	6:00 PMEST/EDT	Partial Working
5:00 PMMST/MDT	+2 Hours →	7:00 PMEST/EDT	Evening
6:00 PMMST/MDT	+2 Hours →	8:00 PMEST/EDT	Evening
7:00 PMMST/MDT	+2 Hours →	9:00 PMEST/EDT	Evening
8:00 PMMST/MDT	+2 Hours →	10:00 PMEST/EDT	Evening
9:00 PMMST/MDT	+2 Hours →	11:00 PMEST/EDT	Night
10:00 PMMST/MDT	+2 Hours →	12:00 AMEST/EDTNext day	Night
11:00 PMMST/MDT	+2 Hours →	1:00 AMEST/EDTNext day	Night

This table applies to Mountain locations like Denver and Salt Lake City; see Phoenix time in summer for non-DST exceptions.

Need to convert in the opposite direction? View the reverse chart from EST to MST.

How to Convert Any Mountain Time to Eastern Time

To convert from Mountain Time to Eastern Time in your head:

Identify your Mountain hour: For instance, 10:00 AM.
Add 2 hours: 10:00 + 2 hours = 12:00 PM.
Check for AM/PM flips: 11:00 AM MST flips to 1:00 PM EST. 10:00 PM MST flips to 12:00 AM (midnight next day) EST.

How to Read the 24-Hour Conversion Table

Because Eastern Time is 2 hours ahead of Mountain Time, standard daytime hours convert seamlessly within the same calendar day. However, late-night conversions cross the midnight threshold into the next calendar day:

10:00 PM MST (22:00) converts to 12:00 AM (00:00) EST Next Day.
11:00 PM MST (23:00) converts to 1:00 AM (01:00) EST Next Day.

If you are scheduling overnight batch jobs, international flights, or late-night tech releases, always double-check the shift window on clock change Sundays and the date shift indicator displayed on the table.

Core Business Overlap Windows

For remote workers and corporate teams collaborating across North America, explore the best overlap hours for meetings where both time zones fall within 9:00 AM to 5:00 PM:

Mountain Workday Perspective

9:00 AM – 3:00 PM MST

Coincides with 11:00 AM – 5:00 PM EST. Best for cross-time-zone calls and meetings.

Eastern Workday Perspective

11:00 AM – 5:00 PM EST

Coincides with 9:00 AM – 3:00 PM MST. Ideal window to catch Mountain teams before end of day.

Frequently Asked Questions About the 24-Hour Table

Does the 2-hour difference apply across the entire 24-hour table?

Yes. For regions observing standard Daylight Saving Time (such as Denver, Salt Lake City, New York, and Miami), Eastern Time is always exactly 2 hours ahead of Mountain Time across every hour of the day. Learn why the gap is exactly 2 hours.

What happens when converting late night hours (10 PM or 11 PM MST)?

When converting 10:00 PM MST, it becomes 12:00 AM (midnight) the next day in EST. Similarly, 11:00 PM MST converts to 1:00 AM the next day EST.

What about Arizona time?

Arizona remains on MST (UTC-7) all year. During winter (EST), Arizona is 2 hours behind New York. During summer (EDT), Arizona is 3 hours behind New York. For Arizona-specific tables, view our Arizona Time to EST guide.

What is 8am mst to est?

8:00 AM MST is exactly 10:00 AM EST. Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time.

What is 9am mst to est?

9:00 AM MST is exactly 11:00 AM EST. Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time.

What is 10am mst to est?

10:00 AM MST is exactly 12:00 PM EST (Noon). Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time.

What is 11am mst to est?

11:00 AM MST is exactly 1:00 PM EST. Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time.

What is 12pm mst to est (Noon)?

12:00 PM MST (Noon) is exactly 2:00 PM EST. Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time.

What is 1pm mst to est?

1:00 PM MST is exactly 3:00 PM EST. Because Eastern is 2 hours ahead of Mountain, you simply add 2 hours to your Mountain Time. Find more answers in our common MST and EST questions.