Current Time in London

London Time Zone: GMT and BST Explained

London is the home of Greenwich Mean Time (GMT), the world's original time standard established at the Royal Observatory in Greenwich in 1884. GMT is UTC+0 — it serves as the zero point from which all other time zones on Earth are measured. During British Summer Time (BST), the UK moves to UTC+1, shifting clocks forward by one hour to extend evening daylight.

The transition to BST happens at 1:00 AM on the last Sunday of March each year, and clocks return to GMT at 2:00 AM on the last Sunday of October. This means London's UTC offset changes twice a year, which is important to account for when scheduling international calls or meetings that span the clock-change dates.

London Business Hours and Financial Markets

Standard business hours in London are Monday to Friday, 9:00 AM to 5:30 PM GMT/BST. The City of London — London's financial district — often starts earlier, with many traders and bankers at their desks by 7:00 or 8:00 AM.

The London Stock Exchange (LSE) opens at 8:00 AM and closes at 4:30 PM GMT. This makes London's morning session the critical overlap period where European, Middle Eastern, and early American markets are all active simultaneously. London's afternoon session (2:00–4:30 PM GMT) coincides with the New York market open (9:30 AM EST), creating the world's highest-volume trading window.

Time Differences: London to Major World Cities

Best Times to Schedule Calls with London

• London ↔ New York: 2:00–5:00 PM London time = 9:00 AM–12:00 PM New York (EST). This is the prime transatlantic window used by most financial and tech firms.
• London ↔ Dubai: 9:00 AM–1:00 PM London = 1:00–5:00 PM Dubai. Morning London sessions align well with Dubai afternoons.
• London ↔ Singapore: 8:00–10:00 AM London = 4:00–6:00 PM Singapore. The window is narrow but usable at the start of the London day.
• London ↔ Los Angeles: 4:00–6:00 PM London = 8:00–10:00 AM Los Angeles (PST). Late afternoon London aligns with early morning Pacific Time.

About London

London is the capital and largest city of England and the United Kingdom. With a population of over 9 million in the city proper and around 14 million in the greater metropolitan area, it is one of the world's most populous cities. London is a global centre of finance, culture, media, education, and government.

As the home of Greenwich and the prime meridian, London has a unique historical claim as the anchor of world timekeeping. The concept of time zones itself was formalised at the International Meridian Conference held in Washington D.C. in 1884, where Greenwich was chosen as the prime meridian — making London's local time the global reference point still used today.