BST to MST
-8hBST
BSTSOURCEMST
MSTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and MST on the World Map
The map below highlights the BST (British Summer Time) and MST (Mountain Standard Time) timezone regions across the globe.
BST – British Summer Time
UTC+01:00British Summer Time (BST, UTC+01:00) is the daylight saving period in the United Kingdom, running from late March to late October.
- •BST runs from the last Sunday in March to the last Sunday in October.
- •BST is exactly one hour ahead of GMT, the UK's standard time.
- •During BST, London is 4 hours ahead of New York while the US is on Eastern Daylight Time.
- •The Isle of Man and the Channel Islands also observe BST.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
BST to MST Time Difference – Complete Guide
BST runs on British Summer Time (BST) at UTC+01:00. MST runs on Mountain Standard Time (MST) at UTC-07:00. That puts BST 8 hours behind MST — a difference of -8h at the current offsets.
In practice, when it is 9:00 AM in BST it is 1:00 AM in MST. Midnight in BST is 4:00 PM in MST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
BST to MST time conversion table
| BST (BST) | MST (MST) | Day |
|---|---|---|
| 12:00 AM | 4:00 PM | previous day |
| 6:00 AM | 10:00 PM | previous day |
| 7:00 AM | 11:00 PM | previous day |
| 8:00 AM | 12:00 AM | same day |
| 9:00 AM | 1:00 AM | same day |
| 12:00 PM | 4:00 AM | same day |
| 3:00 PM | 7:00 AM | same day |
| 5:00 PM | 9:00 AM | same day |
| 6:00 PM | 10:00 AM | same day |
| 9:00 PM | 1:00 PM | same day |
Why people convert BST to MST time
- Scheduling a call from BST to MST: a 10:00 AM start in BST lands at 2:00 AM in MST, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -8h gap: BST and MST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in MST is 1:00 AM in BST.
- Keeping family and friends in sync: knowing that 8:00 PM in BST is 12:00 PM in MST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a -8h gap is not.
- With a -8h gap there is no shared 9-to-5 window, so alternate the early start: one week BST takes the early slot, the next week MST does.
About BST (British Summer Time)
British Summer Time (BST) is the daylight saving period in the United Kingdom, when clocks move one hour forward from Greenwich Mean Time (GMT, UTC+00:00) to UTC+01:00. It runs from the last Sunday in March to the last Sunday in October. England, Scotland, Wales and Northern Ireland all follow it, along with the Isle of Man and the Channel Islands of Jersey and Guernsey. During BST, London is one hour ahead of UTC, four hours ahead of New York on Eastern Daylight Time, and five hours ahead of New York once the United States returns to Eastern Standard Time in November. BST is also used to abbreviate Bangladesh Standard Time (UTC+06:00), which is listed separately on this site.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
Best time to call between BST and MST
With a -8h offset there is no overlap inside a normal 9 AM – 5 PM day. MST opens at 9:00 AM MST, which is 1:00 AM in BST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
BST and MST have no shared working hours because of the -8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
BST is 8 hours behind MST (BST UTC+01:00 → MST UTC-07:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
BST
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between BST and MST?
BST (BST, UTC+01:00) is 8 hours behind MST (MST, UTC-07:00). The gap is currently -8h.
How do I convert BST time to MST time?
Add -8h to BST local time. For example, 9:00 AM in BST is 1:00 AM in MST.
What time is it in MST right now?
MST uses MST at UTC-07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -8h offset from BST.
What is the best time to call MST from BST?
There is no shared working-hours window because of the -8h gap. The closest option is 1:00 PM in BST, which is 5:00 AM in MST.
Which is behind, BST or MST?
BST is 8 hours behind MST. When it is 12:00 PM in BST it is 4:00 AM in MST.
Does daylight saving time affect the BST–MST difference?
Neither zone observes daylight saving time, so the -8h offset between BST and MST is fixed all year.
Which other cities share BST's time zone?
BST also covers London, Birmingham, Manchester, Glasgow, Edinburgh, Cardiff, Belfast, Liverpool and 2 more.
Which countries use BST, BST's zone?
BST is used in United Kingdom.
Is there a day difference between BST and MST?
Not normally. The -8h gap only pushes the date over the previous day.
What is the time difference between BST and MST?
MST is -8h from BST.
What timezone is BST in?
BST operates on its local timezone.
What timezone is MST in?
MST operates on its local timezone.
Which countries use BST (British Summer Time)?
BST is used in United Kingdom.
Does BST observe daylight saving time?
Yes, BST switches to BST during summer months.
What are some interesting facts about BST?
BST runs from the last Sunday in March to the last Sunday in October. BST is exactly one hour ahead of GMT, the UK's standard time.
Which cities are in the MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
When is it midnight in BST, what time is it in MST?
When it is 12:00 AM (midnight) in BST (BST), it is -8h later in MST (MST).
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