What time zone is London in?

London uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) from late March to late October.

Is London GMT or UTC?

London observes GMT (UTC+0) in winter. GMT and UTC are numerically identical but UTC is the scientific standard used globally.

Does London observe Daylight Saving Time?

Yes — British Summer Time (BST, UTC+1) runs from the last Sunday in March to the last Sunday in October.

Why is London the reference for world time?

Greenwich, London was chosen at the 1884 International Meridian Conference as the Prime Meridian — 0° longitude — making GMT the world's time baseline.

London Time Zone — GMT/BST UTC+0

🇬🇧

London

--:--:--

Updates every second

GMT OffsetGMT+0 / GMT+1 (BST in summer)

UTC OffsetUTC+0 (GMT) / UTC+1 (BST)

Difference from your clock: …

Time Zone Details

Time Zone

Europe/London

Continent

Europe

Country

United Kingdom

Daylight Saving

Yes — DST observed

British Summer Time (BST, UTC+1) runs late March to late October.

Open London in Time Hub →

Sunrise & Sunset

🌅

Sunrise

4:45 AM – 8:05 AM

🌇

Sunset

3:55 PM – 9:20 PM

Approximate seasonal range. Exact times vary by date.

Seasons & Climate

Mild oceanic climate. Summers warm ~22 °C (72 °F); winters cool ~7 °C (45 °F) with frequent rain.

Best Time to Visit

May–September

City Quick Facts

Population

9 million (city); ~14 million (metro)

Official Language

English

Currency

GBP (£)

Calling Code

+44

Business Hours

Mon–Fri 9 AM – 5:30 PM GMT/BST

Weekend

Saturday & Sunday

Time Zone Facts

London's Greenwich (GMT) is the reference point from which all the world's time zones are measured.
The London Stock Exchange opens at 8:00 AM GMT, overlapping with both New York and Asian markets.
During BST (summer), London is only 1 hour ahead of UTC — but 5 hours ahead of New York EDT.
GMT has been the global time standard since 1884 when the International Meridian Conference voted for it.
The BBC broadcasts time signals ('pips') at GMT precisely, trusted worldwide for calibration.