Each year the clocks go forward an hour at the beginning of summer and fall back an hour at the end – this marks the period known as British Summer Time.
In the UK, clocks go one hour forward at 1 a.m. on the last Sunday in March and go back one hour at 2 a.m. on the last Sunday in October.
The switch to UK daylight saving time means there will be more daylight in the evening and less daylight in the morning (sometimes referred to as summer time).
When the clocks go back, the UK is on Greenwich Mean Time (GMT).
And while autumn has already begun – it started on September 22nd (astronomical fall) or September 1st (meteorological fall) – British summer time is not over yet.
The date for the clock change is different every year, as it always falls on a Sunday thanks to an EU regulation.
In 2020, the clocks will go back at 2 a.m. on Sunday, October 25th.
The change means you have an extra hour in bed on Sunday morning.
The UK daylight saving time proposal was first made in 1907 by William Willett to help the country get the most out of daylight work.
The clocks first changed in 1916 – a month after Germany introduced the same measure. It helped increase productivity during World War I.
It also reduced the amount of coal Britain would need during the conflict.
Around a quarter of the countries in the world are changing their clocks – including parts, but not all – of the US.
When the clocks go back in late October, the mornings are brighter.