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MDT/MST

Mountain Daylight Time

GMT -6

12am

3am

6am

9am

12pm

3pm

6pm

9pm

Mountain Time is on daylight saving time: MDT (UTC−6) until Sun, Nov 1.

Arizona stays on MST (UTC−7).

Denver · MDT (UTC−6)Arizona · MST all year (UTC−7)

CDT/CST

Central Daylight Time

GMT -5

12am

3am

6am

9am

12pm

3pm

6pm

9pm

Central Time is on daylight saving time: CDT (UTC−5) until Sun, Nov 1.

Mexico City and Saskatchewan stay on CST (UTC−6).

Chicago · CDT (UTC−5)Mexico City, Saskatchewan · CST all year (UTC−6)

Quick answers

Selected conversion

6:00 am06:00 MDT (UTC-6), Oct 5, 2026 = 7:00 am07:00 CDT (UTC-5), Oct 5, 2026

MDT is 1 hour behind CDT.

MST and CST examples

These examples always use MST (UTC-7) and CST (UTC-6). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

MST is 1 hour behind CST.

How the time difference changes

For most of the year, MDT is 1 hour behind CDT. At other times of the year, MST is 1 hour behind CST. Briefly around clock changes, MDT and CST have the same time or MST is 2 hours behind CDT.

For most of the year, working hours of 9:00 am to 5:00 pm in MDT correspond to 10:00 am to 6:00 pm in CDT. At other times of the year, working hours of 9:00 am to 5:00 pm in MST correspond to 10:00 am to 6:00 pm in CST.For most of the year, working hours of 09:00 to 17:00 in MDT correspond to 10:00 to 18:00 in CDT. At other times of the year, working hours of 09:00 to 17:00 in MST correspond to 10:00 to 18:00 in CST.

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

Time Difference

Mountain Daylight Time is 1 hour behind Central Daylight Time.
6:00 am06:00 in MDT is 7:00 am07:00 in CDT

MDT to CDT call time
Best time for a conference call or a meeting is between 9am-4pm09:00-16:00 in MDT which corresponds to 10am-5pm10:00-17:00 in CDT

6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours
7:00 am07:00 Central Daylight Time (CDT). Offset UTC -5:00 hours

6:00 am06:00 MDT / 7:00 am07:00 CDT

MDT	CDT
12:00am	1:00am
1:00am	2:00am
2:00am	3:00am
3:00am	4:00am
4:00am	5:00am
5:00am	6:00am
6:00am	7:00am
7:00am	8:00am
8:00am	9:00am
9:00am	10:00am
10:00am	11:00am
11:00am	12:00pm
12:00pm	1:00pm
1:00pm	2:00pm
2:00pm	3:00pm
3:00pm	4:00pm
4:00pm	5:00pm
5:00pm	6:00pm
6:00pm	7:00pm
7:00pm	8:00pm
8:00pm	9:00pm
9:00pm	10:00pm
10:00pm	11:00pm
11:00pm	12:00am
00:00	01:00
01:00	02:00
02:00	03:00
03:00	04:00
04:00	05:00
05:00	06:00
06:00	07:00
07:00	08:00
08:00	09:00
09:00	10:00
10:00	11:00
11:00	12:00
12:00	13:00
13:00	14:00
14:00	15:00
15:00	16:00
16:00	17:00
17:00	18:00
18:00	19:00
19:00	20:00
20:00	21:00
21:00	22:00
22:00	23:00
23:00	00:00

Mountain Standard Time

Offset: MST is 7 hours behind Greenwich Mean Time (GMT) and is used in North America

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

Principal Cities: The largest city in the MST time zone is Phoenix in the United States, with about 1.65 million people. Other major cities in this time zone include Calgary, Edmonton, Hermosillo, Culiacan.

French: HNR - Heure Normale des Rocheuses

Spanish: MT - Zona Pacífico

MST Time Zone Geo Map — MST timezone map

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Mountain Daylight Time (MDT).

End: Mountain Standard Time (MST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.

Start: Mountain Standard Time (MST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.

See upcoming clock changes worldwide.

MST representations, usage and related time zones

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

-07 - basic short
-0700 - basic
-07:00 - extended

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

-0700 - sign character (-) followed by a four digit time providing hours (07) and minutes (00) of the offset. Indicates an offset of seven hours to the west of the zero meridian.

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

Tango - Military abbreviation for MST
T - short form of 'Tango'

IANA/Olson: Reflects MST 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/Creston
America/Dawson
America/Dawson_Creek
America/Denver
America/Edmonton
America/Fort_Nelson
America/Hermosillo
America/Inuvik
America/Mazatlan
America/Phoenix
America/Shiprock
America/Whitehorse
America/Yellowknife
Canada/Mountain
Canada/Yukon
MST
MST7MDT
Mexico/BajaSur
Navajo
US/Arizona
US/Mountain

Time zones with the GMT -7 offset:

MST - Mountain Standard Time
PDT - Pacific Daylight Time
YST - Yukon Standard Time
T - Tango Time Zone

Central Standard Time

Offset: CST is 6 hours behind Greenwich Mean Time (GMT) and is used in North America

Countries using this time zone: Belize, Canada, Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, El Salvador, United States

Principal Cities: The largest city in the CST time zone is Mexico City in Mexico, with about 12.294 million people. Other major cities in this time zone include Chicago, Houston, Iztapalapa, Ecatepec.

French: HNC - Heure Normale du Centre

Spanish: CT - Tiempo Central Estándar, CT - Zona Centro

CST Time Zone Geo Map — CST timezone map

Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Central Daylight Time (CDT).

End: Central Standard Time (CST) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.

Start: Central Standard Time (CST) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.