Every year, the clocks go back on the last Sunday of October. We’ll get an extra hour in bed this year on 27 October when the clocks go back an hour at 2am, reverting to Greenwich Mean Time (GMT).

https://www.scotsman.com/lifestyle/homes-gardens/when-do-the-clocks-go-back-in-2019-why-we-change-the-clocks-and-where-daylight-saving-time-comes-from-1-4996957