London Time FAQ: Your Questions About GMT, BST, and Time in London Answered

Is London on GMT or BST Right Now?

London is on British Summer Time (BST), which is UTC+1. The next change back to Greenwich Mean Time (GMT, UTC+0) happens on Sunday 25 October 2026 at 02:00 local time, when clocks go back 60 minutes to 01:00.

From late October to late March, London uses GMT (UTC+0). From late March to late October, it uses BST (UTC+1). That is the simple rule.

What Is the Current Time in London, UK?

The current local time in London shows the correct offset automatically. London operates on a single IANA time zone, Europe/London, which handles all transitions between GMT and BST. You never need to guess.

Does London Have Daylight Saving Time?

Yes. London observes Daylight Saving Time (DST) every year. The UK calls it British Summer Time (BST).

• Clocks go forward one hour on the last Sunday of March at 01:00 UTC.
• Clocks go back one hour on the last Sunday of October at 01:00 UTC.

This is not the same schedule as North America. The UK changes on different dates from the US and Canada, creating a few weeks each year where the transatlantic time difference is off by one hour from the norm.

London Daylight Saving Time 2026: BST Dates & Rules has the full annual breakdown.

What Is the London Time Zone Called?

The time zone has two names depending on the season:

The IANA database identifier is Europe/London. That single zone covers all historical and current transitions. There is no separate IANA entry for "GMT" or "BST".

How Are GMT and UTC Different?

GMT is a time zone. UTC is a time standard. They share the same offset (UTC+0), but they are not interchangeable.

• GMT is the legal time in the UK during winter. It is a zone with rules, history, and a specific location (the Royal Observatory in Greenwich).
• UTC is the atomic time standard used by the world's computer systems, aviation, and scientific networks.

The UK observes GMT (a zone) during winter. It never "observes UTC". The phrase "London is on UTC" is technically incorrect. London is on GMT (UTC+0) or BST (UTC+1).

Why Does the UK Change Clocks?

The UK introduced Daylight Saving Time with the Summer Time Act 1916. The goal was to shift daylight from morning to evening, saving fuel for the war effort and boosting industrial production. Germany had adopted the same measure weeks earlier.

The practice stuck. The current rules come from the Summer Time Order 2002, which kept the EU directive on summer time after Brexit. The government has stated it has no plans to change the system.

The failed British Standard Time experiment (1968-1971) kept the UK on UTC+1 year-round. It was abandoned after a parliamentary vote, mainly due to complaints from Scotland about dark winter mornings.

London Time Zone History: GMT, BST, and the Experiments covers the full story.

When Do the Clocks Go Forward and Back?

Mnemonic: "spring forward, fall back".

Is Scotland in the Same Time Zone as London?

Yes. Scotland observes the Europe/London zone identically. There is no legal distinction. The IANA database assigns one zone, Europe/London, to the entire United Kingdom.

The debate is political and social. Scotland's northern latitude means winter sunrises arrive late under GMT, which fuels periodic calls for a separate time zone. No such change has ever been enacted.

Does London Use the 24-Hour Clock?

It depends on context.

• Transport timetables and official communications use the 24-hour clock. Rail schedules, airport departures, and the London Stock Exchange all publish times like "17:30", not "5:30 PM".
• Conversation and casual writing use the 12-hour clock with AM/PM. A pub opening time is "8 PM", not "20:00".

Visitors should read timetables in 24-hour format but expect spoken times in 12-hour. The shift is automatic for locals.

What Are the Time Differences Between London and Major Cities?

The gap depends on whether London is on GMT (winter) or BST (summer).

On 15 January 2026 (GMT, UTC+0):

On 15 July 2026 (BST, UTC+1):

The gap to Dubai, Mumbai, Singapore, Tokyo, and Sydney shrinks by one hour when London switches to BST. The gap to the Americas stays the same because both hemispheres change on different schedules.

For detailed overlap and call planning, see London vs New York Time, London vs Tokyo Time, and London vs Sydney Time.

What Are the Daylight Hours in London?

London sits at 51.5° north. Daylight varies dramatically across the year.

Summer evenings stay light past 21:00. Winter afternoons get dark before 16:00. The June solstice is the longest day; the December solstice is the shortest.

When Is the Best Time to Call London?

London's core business hours are 09:00-17:00, Monday to Friday. The financial markets (London Stock Exchange) operate 08:00-16:30 local time.

• From North America: The reliable overlap is 13:00-17:00 London time (08:00-12:00 New York). This is the standard window for transatlantic calls.
• From Asia: The overlap is early morning in London. A 07:00-09:00 London call catches late afternoon in Tokyo and Singapore.
• From Australia: Very little overlap. A London evening call (18:00-20:00) lands at 04:00-06:00 in Sydney. Schedule only for urgent matters.

Business Hours in London has full details for office, shop, and market hours.

Will the UK Stop Changing the Clocks?

There are no active UK government plans to abolish DST. The European Parliament voted in 2019 to end seasonal clock changes, but implementation was stalled, and the UK confirmed it will not participate. Private Member's Bills to move the UK to year-round BST are occasionally proposed but have not gained legislative traction.

Will the UK Stop Changing the Clocks? tracks the latest developments.