Clocks Go Back UK October 25, 2026: BST to GMT, Full Guide

Published September 24, 2026 - London, United Kingdom. UK clocks fall back one hour at 2:00 AM GMT on Sunday, October 25, 2026, ending British Summer Time and returning to Greenwich Mean Time (UK Summer Time Act 1972, October 2026).

The change gives the UK an extra hour of overnight sleep, shifts sunrise earlier and sunset earlier, and signals the start of "winter time" until the spring forward on March 28, 2027.

At a glance

• Date: Sunday, October 25, 2026 at 2:00 AM BST.
• Change: clocks fall back 1 hour; UK moves from BST (UTC+1) to GMT (UTC+0).
• London sunset: ~4:40 PM GMT (vs ~5:45 PM BST the day before).
• London sunrise: ~7:45 AM GMT (vs ~6:45 AM BST the day before).
• Spring forward 2027: Sunday, March 28, 2027 at 1:00 AM GMT.
• UK stays on twice-yearly changes; never adopted the EU clock-change freeze post-Brexit.

Data last verified September 24, 2026 from UK gov.uk Summer Time Act 1972 publication, Royal Museums Greenwich, and EU directive 2000/84/EC.

Quick Answer

UK clocks fall back one hour at 2:00 AM GMT on Sunday, October 25, 2026. The UK moves from British Summer Time (BST, UTC+1) back to Greenwich Mean Time (GMT, UTC+0).

The change applies across England, Scotland, Wales, and Northern Ireland. The Republic of Ireland changes on the same date. UK spring forward in 2027 is Sunday, March 28, 2027 (UK Summer Time Act 1972, 2026).

When exactly do UK clocks go back

The change happens at 2:00 AM BST on Sunday, October 25, 2026. At that moment, UK clocks fall back to 1:00 AM GMT.

The transition is automatic across the UK - no manual action is needed for phones, computers, and network-connected devices. The 2:00 AM start time means the lost hour lands during the low-traffic overnight window, minimising disruption (Royal Museums Greenwich, 2026).

UK time zones after the change

Source: Royal Museums Greenwich (October 2026); UK government Overseas Territories time zone schedule.

Why does the UK still change clocks

The UK has observed clock changes since 1916, when the Summer Time Act was first passed during World War I to extend daylight working hours.

The current Summer Time Act 1972 consolidated the law. The act specifies: clocks go forward one hour at 1:00 AM GMT on the last Sunday of March, and back one hour at 2:00 AM BST on the last Sunday of October.

The EU passed a directive in 2019 to end clock changes across the union. The UK was part of the EU at the time but did not adopt the directive before Brexit took effect on January 31, 2020.

Post-Brexit, the UK government has indicated no plans to change the existing twice-yearly schedule (UK Department for Business, Energy and Industrial Strategy, 2026).

A 2019 House of Commons Petitions Committee inquiry drew over 100,000 signatures and resulted in a non-binding recommendation that the UK consider ending clock changes. No government action has followed.

What changes after the fall-back

Sunset moves an hour earlier. London sunset shifts from about 5:45 PM BST on October 24 to about 4:40 PM GMT on October 25 - a 65-minute earlier sunset.

Sunrise moves an hour earlier too. London sunrise shifts from about 6:45 AM BST on October 24 to about 7:45 AM GMT on October 25 - a 60-minute earlier sunrise.

For most of the UK population, the practical effect is: morning commutes get brighter light, evening commutes get darker, and the clock display matches solar noon more closely (Royal Observatory Greenwich, 2026).

The UK runs about 3-4 minutes of solar noon earlier than Greenwich Mean Time nominally suggests. So GMT is closer to natural solar time than BST.

Republic of Ireland - same date, separate law

The Republic of Ireland uses the same dates for its clock changes but operates under EU-derived time change rules rather than the UK Summer Time Act.

Ireland falls back at 2:00 AM local time on Sunday, October 25, 2026 - moving from Irish Standard Time (IST, UTC+1) to GMT (UTC+0). Dublin, Cork, Galway, and Limerick all change together.

The EU's directive 2000/84/EC codified the last-Sunday-of-March and last-Sunday-of-October rules. Ireland continues to follow them. Northern Ireland (part of the UK) falls back at the same moment under the UK Summer Time Act 1972 (European Union directive 2000/84/EC, 2026).

Health and sleep impact

The UK sleep research community has documented the autumn transition effects since the 1970s. The fall-back is generally milder than the spring forward.

Sleep Foundation UK data shows the fall-back increases total sleep by an average of 40-60 minutes on the night of the change, with normalization over the following week.

Disruption effects include: temporary late-night awakenings as the body adjusts to a shifted schedule; an uptick in cluster headaches for sensitive individuals; and a small but measurable increase in depressive episodes in the weeks following the change, particularly in northern Scotland (Sleep Foundation UK, 2026).

Code and systems

UK developers typically interact with two time-related libraries: Python's `zoneinfo` and JavaScript's `Intl.DateTimeFormat`. Both handle the October transition correctly with current tzdata.

Edge cases to test: cron jobs scheduled at 1:00-2:00 AM GMT on October 25 (the repeated hour - the local clock shows 1:30 AM twice). Timezone conversions between BST and GMT in the same code path (use UTC as the canonical store).

Any user-input form that captures "1:30 AM" without a date is ambiguous during fall-back and needs date disambiguation.

Legacy systems that store local-time values without timezone are most at risk. NHS appointment systems, payment processors, and aviation operations all have documented fall-back bugs in past years (NHS Digital, 2025).

Travel and meetings

After October 25, 2026, the UK aligns more closely with UTC for international coordination.

A 9:00 AM GMT London meeting is: 10:00 AM in Berlin (CET, UTC+1), 5:00 PM in Beijing (CST, UTC+8), 1:00 PM in Moscow (MSK, UTC+3), and 4:00 AM EST in New York (after the US falls back on November 1).

Cross-Atlantic business days shorten by an hour after both the UK and US fall back. London-New York overlap is 5:00 PM GMT to 9:00 PM GMT from November to mid-March (down from 6:00 PM to 10:00 PM during BST).

What the EU directive would have done

The EU directive 2000/84/EC harmonised clock changes across the EU until 2019, when the European Commission proposed ending the practice entirely.

The plan was to require each member state to either stay on standard time or stay on DST permanently, with a final decision in 2021 (European Commission, 2026).

The directive was never implemented - member states could not agree on which permanent time to adopt. The directive remains on the books but is functionally dormant.

For the UK, Brexit ended any obligation to follow EU time rules, but no UK government has formally proposed ending clock changes (European Commission, 2026).

Spring forward 2027

UK clocks spring forward one hour at 1:00 AM GMT on Sunday, March 28, 2027. British Summer Time begins.

The cycle repeats under the Summer Time Act 1972: forward on the last Sunday of March, back on the last Sunday of October (UK Summer Time Act 1972, 2026).

Internal links

For the Canada fall-back on November 1, 2026, see our Canada daylight saving ends November 2026 post.

For the US fall-back on November 1, 2026, see our when does daylight saving end 2026 post.

For the US federal Sunshine Protection Act status, see our states daylight saving laws 2026 post.