Between late October and late March, London runs on Greenwich Mean Time (GMT).
Between late March and late October, London runs on British Summer Time (BST), which is GMT +1 hour.
The following table shows the time difference between London (GMT) and most of the world’s major cities.
Please note: from late March to late October, London is one hour ahead of the GMT zone – so you will have to adjust the times accordingly.
| City | ± hours | City | ± hours |
|---|---|---|---|
| Amsterdam | + 1 | Kuala Lumpur | + 8 |
| Athens | + 2 | Lisbon | ± 0 |
| Atlanta | − 5 | Los Angeles | − 8 |
| Auckland | + 12 | Madrid | + 1 |
| Bangkok | + 7 | Manila | + 8 |
| Barcelona | + 1 | Melbourne | + 10 |
| Beijing | + 8 | Mexico City | − 6 |
| Belfast | ± 0 | Montréal | − 5 |
| Berlin | + 1 | Moscow | + 3 |
| Bombay | + 5½ | New York | − 5 |
| Brussels | + 1 | Oslo | + 1 |
| Budapest | + 1 | Ottawa | − 5 |
| Buenos Aires | − 3 | Paris | + 1 |
| Cairo | + 2 | Perth | + 8 |
| Calcutta | + 5½ | Prague | + 1 |
| Calgary | − 7 | Reykjavik | ± 0 |
| Chicago | − 6 | Rio de Janeiro | − 3 |
| Copenhagen | + 1 | Rome | + 1 |
| Damascus | + 2 | San Francisco | − 8 |
| Denver | − 7 | Santiago | − 4 |
| Dublin | ± 0 | Seoul | + 9 |
| Edinburgh | ± 0 | Shanghai | + 8 |
| Frankfurt | + 1 | Singapore | + 8 |
| Geneva | + 1 | St. Louis | − 6 |
| Glasgow | ± 0 | St. Petersburg | + 3 |
| Havana | − 5 | Stockholm | + 1 |
| Helsinki | + 2 | Sydney | + 10 |
| Hong Kong | + 8 | Tokyo | + 9 |
| Honolulu | − 10 | Toronto | − 5 |
| Houston | − 6 | Vancouver | − 8 |
| Istanbul | + 2 | Vienna | + 1 |
| Jakarta | + 7 | Warsaw | + 1 |
| Jerusalem | + 2 | Zurich | + 1 |
| Johannesburg | + 2 | ||