The late-October week when London and New York are four hours apart
A worked scheduling example for the gap between the UK and US autumn transitions.
Two transitions, one unusual working week
The UK changes clocks on 25 October 2026; participating US locations change on 1 November. Consequently, the working week of 26–30 October sits between the two transitions. For London and New York, the daytime difference is four hours during that week rather than the familiar five. This is a calculation from the two published schedules, not a separate government announcement or a permanent change to either city’s time zone.
A London-anchored meeting
Consider a meeting that stays at 15:00 in London. On Friday 23 October, it is 10:00 in New York. On Monday 26 October, it is 11:00 in New York. On Monday 2 November, it is 10:00 there again. The London organizer has not moved the meeting, but the New York participant sees two changes. Use the city comparison to check your own date and hour instead of applying this example to every appointment.
The organizer’s time zone is decisive
Now reverse the arrangement: a meeting held at a fixed New York local time moves on the London calendar. This is why telling colleagues simply that “the meeting moves an hour” is insufficient. Say whose clock remains fixed and list both resulting local times. For an existing invitation, inspect its time-zone setting before editing it. A manual correction can create a second shift if the calendar has already applied the seasonal rule.
Communicate the exception once
Send one concise confirmation for the affected occurrence or week, including the full date and both city names. Retain the calendar invitation as the source of truth and update it if the group deliberately chooses a different time. Teams with a third region should check all participants: the four-hour example only describes this city pair. Our meeting-planning guide explains how to compare availability rather than treating matching clock times as matching working hours.
Sources
Related reading
UK clocks go back on 25 October: what to check before Sunday
A practical briefing on the return to GMT, overnight appointments and international calls.
US daylight saving time ends on 1 November 2026
The change applies in participating locations; use the destination city rather than a nationwide assumption.
How to find a fair meeting time across time zones
Start with real availability, compare a specific date and share inconvenient hours fairly.