London

United Kingdom • Greenwich Mean Time

Time Zone

London uses Greenwich Mean Time (GMT / BST), currently running at UTC+0 (winter) / UTC+1 (summer). Clocks advance to British Summer Time (BST) in late March and return to Greenwich Mean Time in late October.

Business & Commerce

London is home to the Greenwich Meridian — the historical zero line of the world's time-zone system — and operates on Greenwich Mean Time (GMT, UTC+0) in winter, advancing to British Summer Time (BST, UTC+1) in spring and summer. As one of the two dominant global financial centers (alongside New York), London hosts the London Stock Exchange and the global foreign exchange market, which is the largest and most liquid financial market in the world, averaging over six trillion dollars in daily trades. London's session is uniquely placed in the trading day: the LSE opens as Tokyo and Singapore are winding down and overlaps with the New York session for several hours each afternoon. This overlap — roughly 8 AM to noon ET — is when global FX and equities volume is typically highest. London is five hours ahead of New York (EST) and one hour behind Paris (CET) during winter.