British Summer Time (BST) officially starts at 1am on Sunday, 29 March 2020, when the clocks go forward an hour.
Each year, the clocks go back on the last Sunday of October, and forward on the last Sunday of March.
Why do the clocks go forward?
An American politician and inventor called Benjamin Franklin first came up with the idea while in Paris in 1784.
He suggested that if people got up earlier, when it was lighter, then it would save on candles.
In 1916, Germany became the first country to adopt daylight saving time. The UK did the same a few weeks later, along with many other nations involved in the First World War (1914-1918).