BST to MST converter
MST is usually 7 h behind BST. It is 6 h behind BST 8 Mar–29 Mar and 25 Oct–1 Nov 2026, because of daylight saving time.
BST to MST table
For 12 July 2026, when MST is 7 h behind BST. Other dates: see the table on the right.
| BST | MST |
|---|---|
| 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 |
| 10:00 AM | 3:00 AM |
| 11:00 AM | 4:00 AM |
| 12:00 PM | 5:00 AM |
| 1:00 PM | 6:00 AM |
| 2:00 PM | 7:00 AM |
| 3:00 PM | 8:00 AM |
| 4:00 PM | 9:00 AM |
| 5:00 PM | 10:00 AM |
| 6:00 PM | 11:00 AM |
| 7:00 PM | 12:00 PM |
| 8:00 PM | 1:00 PM |
| 9:00 PM | 2:00 PM |
| 10:00 PM | 3:00 PM |
| 11:00 PM | 4:00 PM |
When the difference changes
Computed from the IANA tz database (release 2026c). Governments can change these rules; the live converter uses your browser’s own copy of the database.
| 2026: from (UTC) | until (UTC) | MST vs BST |
|---|---|---|
| 1 January 2026 | 8 March 2026 | 7 h behind |
| 8 March 2026 | 29 March 2026 | 6 h behind |
| 29 March 2026 | 25 October 2026 | 7 h behind |
| 25 October 2026 | 1 November 2026 | 6 h behind |
| 1 November 2026 | 31 December 2026 | 7 h behind |
| 2027: from (UTC) | until (UTC) | MST vs BST |
|---|---|---|
| 1 January 2027 | 14 March 2027 | 7 h behind |
| 14 March 2027 | 28 March 2027 | 6 h behind |
| 28 March 2027 | 31 October 2027 | 7 h behind |
| 31 October 2027 | 7 November 2027 | 6 h behind |
| 7 November 2027 | 31 December 2027 | 7 h behind |
BST: British Summer Time · BST time now
BST only exists from late March to late October. The rest of the year the UK is on GMT. This page follows the London clock either way.
MST: Mountain Time · MST time now
Arizona (America/Phoenix) stays on MST all year, so for part of the year it matches Pacific Time instead of Denver.
Related converters
Questions
What is the time difference between BST and MST?
MST is usually 7 h behind BST. It is 6 h behind BST 8 Mar–29 Mar and 25 Oct–1 Nov 2026, because of daylight saving time.
What is 9 am BST in MST?
9:00 am BST is 2:00 AM MST, on dates when the usual difference applies. Use the converter above for any specific date.
Which BST does this page use?
BST only exists from late March to late October. The rest of the year the UK is on GMT. This page follows the London clock either way.
Which MST does this page use?
Arizona (America/Phoenix) stays on MST all year, so for part of the year it matches Pacific Time instead of Denver.