You set the clocks back one hour on the last Sunday in October in places that use the usual “spring forward, fall back” daylight saving time pattern, like the UK and most of Europe.

For example, in:

  • The UK, the clocks go back on the last Sunday in October at 2:00 am, returning to standard time.
  • The Netherlands (same EU rule), clocks also go back on the last Sunday in October, one hour at night.

A quick way to remember it is the phrase “spring forward, fall back”:

In spring, you move clocks forward an hour; in fall, you move them back an hour.

If you’re in North America, the exact date can differ slightly (usually early November), so it’s worth checking a local government or city site for the specific year. NYC, for instance, publishes exact daylight saving change dates for each year.

TL;DR: In most places that observe it, you set the clocks back by one hour on the last Sunday of October (or early November in much of North America). Always confirm locally for your country and year.