Britain's clocks will go forward at 1am on the last Sunday of March, which also happens to be Mothering Sunday this year.
The changing of the clocks on Sunday March 26 means an hour less in bed. It also marks the start of more the daylight in the evenings, but less in the mornings.
The summer months, when the clocks are an hour ahead, are known as British Summer Time or Daylight Saving Time.
When the clocks go back on October 29, the UK will return to Greenwich Mean Time (GMT).
When will the clocks go forward? When will the clocks change this spring?
Druids watch sunrise as they celebrate the spring equinox at Stonehenge
Why do the clocks change in Britain?
The idea of setting the clocks ahead was first suggested in an essay by Benjamin Franklin in 1784.
Over a century later, Englishman William Willett campaigned for the changing of the clocks and published a pamphlet, called the Waste of Daylight, in 1907.
Britain first adopted British Summer Time during World War One in order to save fuel by reducing the need for artificial light.
Spring 2016 in pictures
Fri, June 3, 2016
After the UK’s third warmest winter since 1910, spring has sprung into action earlier then expected.
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Unseasonably cold weather and rain has put most visitors off venturing to the east coast
When does spring start?
Tuesday March 1 2017 is the first day of spring, according to meteorological calendar which is based on the weather.
Under this system, each of the four seasons have three months with spring lasting from the start of March to the end of May.
But the first day of spring is not until March 20, according to the astronomical calendar based on the Earth's orbit of the sun.
On this date, which coincides with the spring equinox, both day and night are the same length.
The equinox is an astronomical event in which the sun crosses the celestial equator – the projection of the Earth's equator into space.