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Timezone Prime

EST to MST converter

Convert Eastern Time (EST/EDT) to Mountain Time (MST/MDT), with daylight saving applied for the exact date you pick.

From

Tue, Oct 27

To

Tue, Oct 27 Same day

EDT 9 to 5 MDT 9 to 5

From zone
Eastern Daylight Time
Offset and clock
UTC−4 Daylight saving time
IANA name
America/New_York
To zone
Mountain Daylight Time
Offset and clock
UTC−6 Daylight saving time
IANA name
America/Denver

MDT is 2 hours behind EDT.

Time difference
MDT is 2 hours behind EDT for most of the year (238 days in 2026). The gap is 3 hours for 0 days in 2026. The gap is 1 hour for 0 days in 2026.
Meeting window
Working days of 9 AM to 5 PM overlap from 11:00 AM to 5:00 PM EDT, which is 9:00 AM to 3:00 PM MDT while EDT and MDT apply.
Daylight saving
Both zones change their clocks, on the dates listed below, so the gap can shift during the year.

The same conversion works for every city on these clocks, such as New York to Denver, New York to Arizona and Toronto to Denver.

Where EST and MST apply

Shaded areas follow the official zone boundaries, so a country split across zones is split here too. Hover or tap a region for its local time.

  • Eastern Time
  • Mountain Time
  • Same UTC offset right now, different zone rules

Drag to pan. Ctrl and scroll, or pinch, to zoom. Boundaries: timezone-boundary-builder, © OpenStreetMap contributors

Hour by hour

Every hour of Tuesday, October 27, 2026, side by side. Days with a clock change show 23 or 25 rows.

Shaded rows fall inside working hours in both places.

Hourly comparison of the two time zones. Choose a time to load it in the converter.
New York (EDT) Denver (MDT) Working hours
12:00 AM 10:00 PM previous day
1:00 AM 11:00 PM previous 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 Both working
12:00 PM 10:00 AM Both working
1:00 PM 11:00 AM Both working
2:00 PM 12:00 PM Both working
3:00 PM 1:00 PM Both working
4:00 PM 2:00 PM Both working
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 to MST conversion table

Every hour of the Eastern Time day, plus the common half hours, and their MST equivalents. The second column covers the part of the year when the clocks are on a different gap.

EST to MST conversion table
Eastern Time MDT or MST 2 h behind, all year MST 3 h behind, 0 days in 2026
12:00 AM 10:00 PM (previous day)9:00 PM (previous day)
1:00 AM 11:00 PM (previous day)10:00 PM (previous day)
2:00 AM 12:00 AM11:00 PM (previous day)
3:00 AM 1:00 AM12:00 AM
4:00 AM 2:00 AM1:00 AM
5:00 AM 3:00 AM2:00 AM
6:00 AM 4:00 AM3:00 AM
7:00 AM 5:00 AM4:00 AM
8:00 AM 6:00 AM5:00 AM
9:00 AM 7:00 AM6:00 AM
9:30 AM 7:30 AM6:30 AM
10:00 AM 8:00 AM7:00 AM
10:30 AM 8:30 AM7:30 AM
11:00 AM 9:00 AM8:00 AM
11:30 AM 9:30 AM8:30 AM
12:00 PM 10:00 AM9:00 AM
12:30 PM 10:30 AM9:30 AM
1:00 PM 11:00 AM10:00 AM
1:30 PM 11:30 AM10:30 AM
2:00 PM 12:00 PM11:00 AM
2:30 PM 12:30 PM11:30 AM
3:00 PM 1:00 PM12:00 PM
3:30 PM 1:30 PM12:30 PM
4:00 PM 2:00 PM1:00 PM
4:30 PM 2:30 PM1:30 PM
5:00 PM 3:00 PM2:00 PM
5:30 PM 3:30 PM2:30 PM
6:00 PM 4:00 PM3:00 PM
7:00 PM 5:00 PM4:00 PM
8:00 PM 6:00 PM5:00 PM
9:00 PM 7:00 PM6:00 PM
10:00 PM 8:00 PM7:00 PM
11:00 PM 9:00 PM8:00 PM

How the gap changes in 2026 and 2027

Each row is a stretch of days with one constant difference, split at every clock change.

Time difference periods between EST and MST
Dates EST MST Difference
Thu, Jan 1, 2026 until Sun, Mar 8, 2026 EST MST MST 2 h behind
Sun, Mar 8, 2026 until Sun, Mar 8, 2026 EDT MST MST 3 h behind
Sun, Mar 8, 2026 until Sun, Nov 1, 2026 EDT MDT MDT 2 h behind
Sun, Nov 1, 2026 until Sun, Nov 1, 2026 EST MDT MDT 1 h behind
Sun, Nov 1, 2026 until Sun, Mar 14, 2027 EST MST MST 2 h behind
Sun, Mar 14, 2027 until Sun, Mar 14, 2027 EDT MST MST 3 h behind
Sun, Mar 14, 2027 until Sun, Nov 7, 2027 EDT MDT MDT 2 h behind
Sun, Nov 7, 2027 until Sun, Nov 7, 2027 EST MDT MDT 1 h behind
Sun, Nov 7, 2027 until Sat, Jan 1, 2028 EST MST MST 2 h behind

Upcoming clock changes

  1. Eastern Time Sunday, November 1, 2026: at 2:00 AM clocks go back 1 hour to 1:00 AM
  2. Mountain Time Sunday, November 1, 2026: at 2:00 AM clocks go back 1 hour to 1:00 AM
  3. Eastern Time Sunday, March 14, 2027: at 2:00 AM clocks go forward 1 hour to 3:00 AM
  4. Mountain Time Sunday, March 14, 2027: at 2:00 AM clocks go forward 1 hour to 3:00 AM
  5. Eastern Time Sunday, November 7, 2027: at 2:00 AM clocks go back 1 hour to 1:00 AM
  6. Mountain Time Sunday, November 7, 2027: at 2:00 AM clocks go back 1 hour to 1:00 AM
  7. Eastern Time Sunday, March 12, 2028: at 2:00 AM clocks go forward 1 hour to 3:00 AM
  8. Mountain Time Sunday, March 12, 2028: at 2:00 AM clocks go forward 1 hour to 3:00 AM

About the two zones

Eastern Time (EST / EDT)

Eastern Time follows the clock in New York. It is Eastern Standard Time (EST, UTC−5) in winter and Eastern Daylight Time (EDT, UTC−4) from the second Sunday in March to the first Sunday in November.

IANA zone
America/New_York
Offset
UTC−5 standard, UTC−4 daylight saving
Used in
the eastern United States and Canada
Major cities
New York, Toronto, Washington, D.C., Atlanta, Miami, Boston

People often write EST all year round. Strictly, EST is only the winter offset; in summer the eastern US is on EDT. The converter follows the real New York clock for the date you pick.

Mountain Time (MST / MDT)

Mountain Time follows the clock in Denver: Mountain Standard Time (MST, UTC−7) in winter and Mountain Daylight Time (MDT, UTC−6) during US daylight saving time.

IANA zone
America/Denver
Offset
UTC−7 standard, UTC−6 daylight saving
Used in
the mountain states of the US and parts of Canada
Major cities
Denver, Salt Lake City, Albuquerque, Calgary, Edmonton, Boise

Most of Arizona stays on MST all year and does not switch to MDT. For Phoenix, pick America/Phoenix in the converter.

EST and MST, answered

What is the time difference between EST and MST?

MDT is 2 hours behind EDT for most of the year (238 days in 2026). The gap is 3 hours for 0 days in 2026. The gap is 1 hour for 0 days in 2026.

How do I work out the time in Denver from EST?

Denver uses Mountain Time. MDT is 2 hours behind EDT for most of the year (238 days in 2026). The gap is 3 hours for 0 days in 2026. The gap is 1 hour for 0 days in 2026. Type any EST time into the EST to MST converter to see the Denver time for any date.

What is 9:00 AM EST in MST?

9:00 AM EDT or EST is 7:00 AM MDT or MST for all year. 9:00 AM EDT is 6:00 AM MST for 0 days in 2026.

What is 12:00 PM EST in MST?

12:00 PM EDT or EST is 10:00 AM MDT or MST for all year. 12:00 PM EDT is 9:00 AM MST for 0 days in 2026.

What is 10:00 AM EST in MST?

10:00 AM EDT or EST is 8:00 AM MDT or MST for all year. 10:00 AM EDT is 7:00 AM MST for 0 days in 2026.

What is 5:00 PM EST in MST?

5:00 PM EDT or EST is 3:00 PM MDT or MST for all year. 5:00 PM EDT is 2:00 PM MST for 0 days in 2026.

Is MST ahead of EST, and by how many hours?

No, MST is behind EST. MDT is 2 hours behind EDT for most of the year (238 days in 2026). The gap is 3 hours for 0 days in 2026. The gap is 1 hour for 0 days in 2026.

What is a good meeting time for EST and MST?

Working days of 9 AM to 5 PM overlap from 11:00 AM to 5:00 PM EDT, which is 9:00 AM to 3:00 PM MDT while EDT and MDT apply.

Does daylight saving time affect EST to MST?

Both zones change their clocks, on their own dates, so the gap can shift during the year. The next change is on Sunday, November 1, 2026 in Eastern Time.

Which EST does the EST to MST converter use?

People often write EST all year round. Strictly, EST is only the winter offset; in summer the eastern US is on EDT. The converter follows the real New York clock for the date you pick.

Which MST does the EST to MST converter use?

Most of Arizona stays on MST all year and does not switch to MDT. For Phoenix, pick America/Phoenix in the converter.

Related conversions

From Eastern Time

To Mountain Time