GMT to BST converter
BST is usually 1 h ahead of GMT. It is the same time as GMT 1 Jan–29 Mar and 25 Oct–31 Dec 2026, because of daylight saving time.
GMT to BST table
For 12 July 2026, when BST is 1 h ahead of GMT. Other dates: see the table on the right.
| GMT | BST |
|---|---|
| 12:00 AM | 1:00 AM |
| 1:00 AM | 2:00 AM |
| 2:00 AM | 3:00 AM |
| 3:00 AM | 4:00 AM |
| 4:00 AM | 5:00 AM |
| 5:00 AM | 6:00 AM |
| 6:00 AM | 7:00 AM |
| 7:00 AM | 8:00 AM |
| 8:00 AM | 9:00 AM |
| 9:00 AM | 10:00 AM |
| 10:00 AM | 11:00 AM |
| 11:00 AM | 12:00 PM |
| 12:00 PM | 1:00 PM |
| 1:00 PM | 2:00 PM |
| 2:00 PM | 3:00 PM |
| 3:00 PM | 4:00 PM |
| 4:00 PM | 5:00 PM |
| 5:00 PM | 6:00 PM |
| 6:00 PM | 7:00 PM |
| 7:00 PM | 8:00 PM |
| 8:00 PM | 9:00 PM |
| 9:00 PM | 10:00 PM |
| 10:00 PM | 11:00 PM |
| 11:00 PM | 12:00 AM next day |
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) | BST vs GMT |
|---|---|---|
| 1 January 2026 | 29 March 2026 | the same time as |
| 29 March 2026 | 25 October 2026 | 1 h ahead of |
| 25 October 2026 | 31 December 2026 | the same time as |
| 2027: from (UTC) | until (UTC) | BST vs GMT |
|---|---|---|
| 1 January 2027 | 28 March 2027 | the same time as |
| 28 March 2027 | 31 October 2027 | 1 h ahead of |
| 31 October 2027 | 31 December 2027 | the same time as |
GMT: Greenwich Mean Time · GMT time now
GMT here means the fixed UTC+0 offset. The UK only uses GMT in winter; in summer London is on BST (UTC+1).
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.
Related converters
Questions
What is the time difference between GMT and BST?
BST is usually 1 h ahead of GMT. It is the same time as GMT 1 Jan–29 Mar and 25 Oct–31 Dec 2026, because of daylight saving time.
What is 9 am GMT in BST?
9:00 am GMT is 10:00 AM BST, on dates when the usual difference applies. Use the converter above for any specific date.
Which GMT does this page use?
GMT here means the fixed UTC+0 offset. The UK only uses GMT in winter; in summer London is on BST (UTC+1).
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.