What the clock change means in practice, including the common traps that cause one-hour errors. daylight saving in London and how to plan safely matters most when a plan spans different places or different dates. London can be on GMT in winter and BST in summer, and that is where most one-hour mistakes come from. If you only need the current time in London , use the home page. If you are planning ahead, include the date and write “London” explicitly so the time stays unambiguous. How to stay accurate without overthinking it Use a simple routine: check the current London status, include the date in your plan, and confirm again if the event is far ahead. Write date + time + London. Add GMT/BST for important timing. Confirm again close to the event. Where one-hour errors come from Most errors happen when someone assumes London is always on GMT, or when two regions change clocks on different weekends and the gap shifts temporarily. If something looks unexpected, check device settings and confirm the date you are working with.

Extra guidance for safer planning When you share a meeting time, include the date, the time, and the location. If the timing is critical, add the label GMT or BST as well. Most one-hour mistakes come from assuming London is always on GMT. London uses GMT in winter and BST in summer, so the date matters. Extra guidance for safer planning If you are planning something important, treat the date as part of the time. A time that is correct today may not be correct for a different week if a clock change happens in between. If you are planning something important, treat the date as part of the time. A time that is correct today may not be correct for a different week if a clock change happens in between. Extra guidance for safer planning If something looks unexpected, check your device time zone settings. A wrong device time zone can make a correct conversion look wrong. For international plans, avoid shorthand. Writing the date and stating “London” removes ambiguity and helps other people convert correctly. Questions and answers Ten quick answers to common questions.