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MST/MDT

Mountain Standard Time

UTC−7

12am

3am

6am

9am

12pm

3pm

6pm

9pm

Mountain Time is on standard time: MST (UTC−7) until Sun, Mar 14, 2027.

Keep MDT (UTC−6)

EST/EDT

Eastern Standard Time

UTC−5

2h ahead

12am

3am

6am

9am

12pm

3pm

6pm

9pm

Eastern Time is on standard time: EST (UTC−5) until Sun, Mar 14, 2027.

Keep EDT (UTC−4)

Quick answers

Selected conversion

9:00 am09:00 MST (UTC-7), Nov 1, 2026 = 11:00 am11:00 EST (UTC-5), Nov 1, 2026

MST is 2 hours behind EST.

MDT and EDT examples

These examples always use MDT (UTC-6) and EDT (UTC-4). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

MDT is 2 hours behind EDT.

How the time difference changes

For most of the year, MDT is 2 hours behind EDT. From Nov 1, 2026 to Mar 14, 2027, MST is 2 hours behind EST. Briefly around clock changes, MDT is 1 hour behind EST or MST is 3 hours behind EDT.

For most of the year, working hours of 9:00 am to 6:00 pm in MDT correspond to 11:00 am to 8:00 pm in EDT. At other times of the year, working hours of 9:00 am to 6:00 pm in MST correspond to 11:00 am to 8:00 pm in EST.For most of the year, working hours of 09:00 to 18:00 in MDT correspond to 11:00 to 20:00 in EDT. At other times of the year, working hours of 09:00 to 18:00 in MST correspond to 11:00 to 20:00 in EST.

Compare MDT time with EDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Mountain Standard Time is 2 hours behind Eastern Standard Time.
9:00 am09:00 in MST is 11:00 am11:00 in EST

MST to EST call time
Best time for a conference call or a meeting is between 9am-4pm09:00-16:00 in MST which corresponds to 11am-6pm11:00-18:00 in EST

9:00 am09:00 Mountain Standard Time (MST). Offset UTC -7:00 hours
11:00 am11:00 Eastern Standard Time (EST). Offset UTC -5:00 hours

9:00 am09:00 MST / 11:00 am11:00 EST

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
MST	EST
	1:00am
	2:00am
	4:00am
	5:00am
	6:00am
	7:00am
	8:00am
	9:00am
	10:00am
	11:00am
	12:00pm
	1:00pm
	2:00pm
	3:00pm
	4:00pm
	5:00pm
	6:00pm
	7:00pm
	8:00pm
	9:00pm
	10:00pm
	11:00pm
	12:00am next day
	1:00am next day
	01:00
	02:00
	04:00
	05:00
	06:00
	07:00
	08:00
	09:00
	10:00
	11:00
	12:00
	13:00
	14:00
	15:00
	16:00
	17:00
	18:00
	19:00
	20:00
	21:00
	22:00
	23:00
	00:00 next day
	01:00 next day

Mountain Daylight Time

Offset: MDT is 6 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: Canada, Mexico, United States

Principal Cities: The largest city in the MDT time zone is Ciudad Juárez in Mexico, with about 1.512 million people. Other major cities in this time zone include Denver, El Paso, Albuquerque, Colorado Springs.

French: HAR - Heure Avancée des Rocheuses

Spanish: MT - Zona Pacífico

Map of the areas on Mountain Daylight Time (MDT) — MDT part of the year
Today the shaded areas are on UTC−7 (MST).
Open the world time zone map © OpenStreetMap

Daylight Saving: Mountain Daylight Time (MDT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Mountain Standard Time (MST).

End: Mountain Daylight Time (MDT) ended on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.

Start: Mountain Daylight Time (MDT) starts on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.

See USA daylight saving time and upcoming clock changes worldwide.

MDT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data

-06 - basic short
-0600 - basic
-06:00 - extended

Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers

-0600 - sign character (-) followed by a four digit time providing hours (06) and minutes (00) of the offset. Indicates an offset of six hours to the west of the zero meridian.

Military/NATO: Used by the U.S. military, Chinese military and others

Sierra - Military abbreviation for MDT
S - short form of 'Sierra'

IANA/Olson: Reflects MDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems

America/Boise
America/Cambridge_Bay
America/Ciudad_Juarez
America/Denver
America/Edmonton
America/Inuvik
America/Shiprock
America/Yellowknife
Canada/Mountain
MST7MDT
Navajo
US/Mountain

Time zones with the GMT -6 offset:

CST - Central Standard Time
CT - Central Time
MDT - Mountain Daylight Time
EAST - Easter Island Standard Time
GALT - Galapagos Time
S - Sierra Time Zone

Eastern Daylight Time

Offset: EDT is 4 hours behind Greenwich Mean Time (GMT).

Countries using this time zone: Bahamas, Canada, Haiti, Turks and Caicos Islands, United States

Principal Cities: The largest city in the EDT time zone is New York City in the United States, with about 8.804 million people. Other major cities in this time zone include Toronto, Montréal, Philadelphia, Port-au-Prince.

French: HAE - Heure Avancée de l'Est

Spanish: EDT - Tiempo de verano del Este, ET - Zona Sureste

Map of the areas on Eastern Daylight Time (EDT) — EDT part of the year
Today the shaded areas are on UTC−5 (EST).
Open the world time zone map © OpenStreetMap

Daylight Saving: Eastern Daylight Time (EDT) is a daylight saving/summer time zone, but some places set clocks back one hour during winter and observe Eastern Standard Time (EST).

End: Eastern Daylight Time (EDT) ended on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks were set one hour back to Sunday, November 1, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the first Sunday of November.

Start: Eastern Daylight Time (EDT) starts on Sunday, March 14, 2027 at 2:00 am02:00 local time and clocks are set one hour forward to Sunday, March 14, 2027, 3:00 am03:00. Daylight saving starts annually on the second Sunday of March.

See USA daylight saving time and upcoming clock changes worldwide.

EDT representations, usage and related time zones