London operates on Greenwich Mean Time (GMT, UTC+0) during winter and British Summer Time (BST, UTC+1) from late March to late October. As the origin of the Prime Meridian, London's timezone serves as the global reference point for all other time zones.
The London Stock Exchange opens at 8:00 AM and closes at 4:30 PM GMT/BST. London's position between Asian and American markets makes it a critical hub for global finance, with significant overlap in trading hours across both regions.
When scheduling across the Atlantic, note that the UK and US don't always switch to daylight saving time on the same dates. For a few weeks in March and November, the time difference between London and New York shifts from 5 hours to 4 hours or vice versa.
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