Royal Observatory Greenwich blog
Clocks change Sunday 27 March

It’s that time of year again when residents of the UK lose an hour’s sleep in exchange for lighter evenings.

At 1.00 am GMT (2.00 am BST) on Sunday 27 March 2011 clocks go forward one hour as civil time changes from Coordinated Universal Time (almost the same as Greenwich Mean Time) to British Summer Time (BST).

The Ninth European Parliament and Council Directive on Summer Time
Arrangements states that summer (or daylight saving) time will be kept
between the last Sunday in March to the last Sunday in October, and the
changes will take place at 01.00 GMT.

Find out more about British Summer Time.

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