BST to MST Time Converter
MST is 7 hours behind BST. BST is UTC+1:00, and The US Mountain states are currently on MDT (UTC-6:00).
Best Time to Call Between BST and MST
Both zones are inside normal business hours between 4:00 PM and 5:00 PM BST — that's 9:00 AM to 10:00 AM MST. That's a 1-hour window.
both at work BST only MST only neither — hours along the strip are BST.
Common Times Converted
BST on the left, MST on the right.
BST to MST: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | MST | Working hours |
|---|---|---|
| 12:00 AM | 5:00 PM prev day | — |
| 1:00 AM | 6:00 PM prev day | — |
| 2:00 AM | 7:00 PM prev day | — |
| 3:00 AM | 8:00 PM prev day | — |
| 4:00 AM | 9:00 PM prev day | — |
| 5:00 AM | 10:00 PM prev day | — |
| 6:00 AM | 11:00 PM prev day | — |
| 7:00 AM | 12:00 AM | — |
| 8:00 AM | 1:00 AM | — |
| 9:00 AM | 2:00 AM | BST only |
| 10:00 AM | 3:00 AM | BST only |
| 11:00 AM | 4:00 AM | BST only |
| 12:00 PM | 5:00 AM | BST only |
| 1:00 PM | 6:00 AM | BST only |
| 2:00 PM | 7:00 AM | BST only |
| 3:00 PM | 8:00 AM | BST only |
| 4:00 PM | 9:00 AM | Both zones |
| 5:00 PM | 10:00 AM | MST only |
| 6:00 PM | 11:00 AM | MST only |
| 7:00 PM | 12:00 PM | MST only |
| 8:00 PM | 1:00 PM | MST only |
| 9:00 PM | 2:00 PM | MST only |
| 10:00 PM | 3:00 PM | MST only |
| 11:00 PM | 4:00 PM | MST only |
What BST and MST Actually Are
BST — British Summer Time
London, Manchester, Birmingham, Glasgow, and the rest of the UK from late March to late October. Standing at UTC+1:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, October 25, 2026, to GMT. BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
British Summer Time began in 1916 as a wartime fuel-saving measure and has run every year since, making it one of the oldest continuous daylight saving schemes in the world.
MST — Mountain Standard Time
Denver, Salt Lake City, Calgary — and Phoenix year-round. Standing at UTC-7:00 as written, and the region does change its clocks, so its live offset moves by an hour twice a year. The next change is on Sunday, November 1, 2026, to MST. Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.
Arizona has stayed on MST year-round since 1968 — the Navajo Nation within it does observe daylight saving, making the state a patchwork.
What This Means in Practice
Both sides change clocks, on different dates
Both regions observe daylight saving but do not switch on the same day, so for a week or two each spring and fall the gap between them is an hour different from the rest of the year. Those short windows are where recurring invitations quietly break.
Major Cities in Each Zone
Cities on BST
Cities on MST
Frequently Asked Questions
What is the time difference between BST and MST?
MST is 7 hours behind BST. That is the live figure. Taken strictly as written, the gap between BST and MST is 8 hours — the two differ because at least one of these regions is currently on daylight saving.
What is 9:00 AM BST in MST?
9:00 AM BST is 2:00 AM MST.
What are the best hours to schedule a call between BST and MST?
Between 4:00 PM and 5:00 PM BST, which is 9:00 AM to 10:00 AM MST. Both sides are inside normal business hours through that window.
Does the difference between BST and MST change during the year?
Yes. Both regions observe daylight saving, and they do not switch on the same dates, so the gap shifts by an hour at least twice a year. The next clock change is on Sunday, October 25, 2026.
Does BST always mean British Summer Time?
BST also stands for Bangladesh Standard Time (UTC+6). BDT is the clearer label for that one.
Does MST always mean Mountain Standard Time?
Arizona stays on MST all year, so Phoenix and Denver are an hour apart for eight months and identical for four.