BST to MDT Time Converter
MDT is 7 hours behind BST. BST is UTC+1:00, and MDT is UTC-6:00.
Best Time to Call Between BST and MDT
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 MDT. That's a 1-hour window.
both at work BST only MDT only neither — hours along the strip are BST.
Common Times Converted
BST on the left, MDT on the right.
BST to MDT: Full 24-Hour Conversion Table
Shaded rows are working hours; the darker shade marks the hours when both zones are at work.
| BST | MDT | 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 | MDT only |
| 6:00 PM | 11:00 AM | MDT only |
| 7:00 PM | 12:00 PM | MDT only |
| 8:00 PM | 1:00 PM | MDT only |
| 9:00 PM | 2:00 PM | MDT only |
| 10:00 PM | 3:00 PM | MDT only |
| 11:00 PM | 4:00 PM | MDT only |
What BST and MDT 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.
MDT — Mountain Daylight Time
Denver, Salt Lake City, Calgary, Edmonton. Standing at UTC-6:00 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.
Because Arizona does not follow it, MDT is the half of the year when Phoenix and Denver read the same clock despite being in different zones.
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 MDT
Frequently Asked Questions
What is the time difference between BST and MDT?
MDT is 7 hours behind BST.
What is 9:00 AM BST in MDT?
9:00 AM BST is 2:00 AM MDT.
What are the best hours to schedule a call between BST and MDT?
Between 4:00 PM and 5:00 PM BST, which is 9:00 AM to 10:00 AM MDT. Both sides are inside normal business hours through that window.
Does the difference between BST and MDT 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.