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European Summer Time is the daylight saving time practiced in Europe, the period during which clocks are advanced by one hour in relation to the official time observed during the rest of the year.
This is done in all of the countries of Europe except Iceland (which observes UTC all year round), and has also been prescribed by a directive of the European Union.
This period extends from 01.00 UTC on the last Sunday in March until 01.00 UTC on the last Sunday in October each year.
Exact timing in the next several years
European Summer Time ends (clocks go back) at 01.00 UTC on
Equation used to calculate the end of European Summer Time:
Sunday October (31 - (5*y/4 + 1) mod 7) at 1h UTC
(valid through 2099, courtesy of Robert H. van Gent, EC)
European Summer Time begins (clocks go forward) at 01.00 UTC on
Equation used to calculate the beginning of European Summer Time:
Sunday March (31 - (5*y/4 + 4) mod 7) at 1h UTC
(validity and credits as above)
Terminology
In the UTC+1 time zone, this period is known as the Central European Summer Time as opposed to the Central European Time in the remainder of the year.
In the United Kingdom this period is known as British Summer Time (BST), while local time during the rest of the year is normally referred to as Greenwich Mean Time (GMT).
External link
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