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BST to MST Converter

Updating current time…
BST
British Summer Time
GMT +1
12am
3am
6am
9am
12pm
3pm
6pm
9pm
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)

Quick answers

Selected conversion

1:00 pm13:00 BST (UTC+1), Oct 4, 2026 = 6:00 am06:00 MDT (UTC-6), Oct 4, 2026

BST is 7 hours ahead of MDT.

BST and MST examples

These examples always use BST (UTC+1) and MST (UTC-7). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

BST is 8 hours ahead of MST.

How the time difference changes

For most of the year, BST is 7 hours ahead of MDT. At other times of the year, GMT is 7 hours ahead of MST or GMT is 6 hours ahead of MDT.

For most of the year, working hours of 9:00 am to 5:00 pm in BST correspond to 2:00 am to 10:00 am in MDT. At other times of the year, working hours of 9:00 am to 5:00 pm in GMT correspond to 2:00 am to 10:00 am in MST or working hours of 9:00 am to 5:00 pm in GMT correspond to 3:00 am to 11:00 am in MDT.For most of the year, working hours of 09:00 to 17:00 in BST correspond to 02:00 to 10:00 in MDT. At other times of the year, working hours of 09:00 to 17:00 in GMT correspond to 02:00 to 10:00 in MST or working hours of 09:00 to 17:00 in GMT correspond to 03:00 to 11:00 in MDT.

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

Time Difference

British Summer Time is 7 hours ahead of Mountain Daylight Time.
1:00 pm13:00 in BST is 6:00 am06:00 in MDT

BST to MDT call time
Best time for a conference call or a meeting is between 4pm-5pm16:00-17:00 in BST which corresponds to 9am-10am09:00-10:00 in MDT

1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
6:00 am06:00 Mountain Daylight Time (MDT). Offset UTC -6:00 hours

1:00 pm13:00 BST / 6:00 am06:00 MDT

BSTMDT
12:00am5:00pm
1:00am6:00pm
2:00am7:00pm
3:00am8:00pm
4:00am9:00pm
5:00am10:00pm
6:00am11:00pm
7:00am12:00am
8:00am1:00am
9:00am2:00am
10:00am3:00am
11:00am4:00am
12:00pm5:00am
1:00pm6:00am
2:00pm7:00am
3:00pm8:00am
4:00pm9:00am
5:00pm10:00am
6:00pm11:00am
7:00pm12:00pm
8:00pm1:00pm
9:00pm2:00pm
10:00pm3:00pm
11:00pm4:00pm
00:0017:00
01:0018:00
02:0019:00
03:0020:00
04:0021:00
05:0022:00
06:0023:00
07:0000:00
08:0001:00
09:0002:00
10:0003:00
11:0004:00
12:0005:00
13:0006:00
14:0007:00
15:0008:00
16:0009:00
17:0010:00
18:0011:00
19:0012:00
20:0013:00
21:0014:00
22:0015:00
23:0016:00

British Summer Time

Offset: BST is 1 hour ahead Greenwich Mean Time (GMT) and is used in Europe

Countries using this time zone: Britain (UK), Guernsey, Isle of Man, Jersey

Principal Cities: The largest city in the BST time zone is London in United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Liverpool, Saint Helier.

BST Time Zone Geo Map
BST timezone map

Daylight Saving: British Summer Time (BST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Greenwich Mean Time (GMT).

Daylight saving time clock moves forward for one hourStart: British Summer Time (BST) started on Sunday, March 29, 2026 at 1:00 am01:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 2:00 am02:00. Daylight saving starts annually on the last Sunday of March.

Daylight saving time clock moves back for one hourEnd: British Summer Time (BST) ends on Sunday, October 25, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.

See upcoming clock changes worldwide.

BST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +01 - basic short
  • +0100 - basic
  • +01:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates an offset of one hour to the east of the zero meridian.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for BST
  • A - short form of 'Alpha'
IANA/Olson: Reflects BST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Europe/Belfast
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
BST Abbreviation: Several time zones share BST abbreviation and it could refer to these time zones
  • British Summer Time - UTC +1
  • Bangladesh Standard Time - UTC +6
  • Bougainville Standard Time - UTC +11
Time zones with the GMT +1 offset:
  • BST - British Summer Time
  • CET - Central European Time
  • IST - Irish Standard Time
  • WEST - Western European Summer Time
  • A - Alpha Time Zone
  • CET - Central European Time
  • MEZ - Mitteleuropäische Zeit
  • WAT - West Africa Time
  • WST - Western Sahara Summer Time
  • BMT - Biel Mean Time

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).

Daylight saving time clock moves forward for one hourEnd: 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.

Daylight saving time clock moves back for one hourStart: 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
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT