With spring in the air and nights getting noticeably lighter, British Summer Time starts in the UK next month when clocks go forward an hour.

So when exactly do clocks change in 2015?

British Summer Time (BST) traditionally starts in the UK on the final Sunday in March and ends on the last Sunday in October.

So clocks will spring forward an hour at 1am on Sunday, March 29, 2015, when BST starts and the country moves out of Greenwich Mean Time (GMT).

This means losing an hour of sleep in the morning.

As a result of the change, there will be more daylight in the evenings and less in the mornings.

Clocks will go back an hour on Sunday, October 25, 2015 when BST ends and the country reverts to GMT.

And when are clocks due to go forward and back next year? The dates in the UK for 2016 are March 27 and October 30.

Across the Atlantic, most of the United States begins Daylight Saving Time at 2am on the second Sunday in March – this year March 8 – and reverts to standard time on the first Sunday in November.

In North America, each time zone switches at a different time. In March, clocks spring forward from 1.59am to 3am and in fall, clocks fall back from 1.59am to 1am.