- European Summer Time
European Summer Time is the arrangement in Europe by which clocks are advanced by one hour in Spring to make the most of seasonal daylight. This is done in all of the countries of Europe except
Icelandwhich observes GMTall year round. In the European Unionthis period extends from 01.00 GMTon the last Sunday in March until 01.00 GMT on the last Sunday in October each year.
Historically the countries of Europe had different practices for observing summer time, but this hindered coordination of transport, communications and movements. In the 1980s the
European Communitybegan issuing directives requiring member states to legislate particular start and end dates for summer-time.
1981each directive has specified a transition time of 01:00 UTC and a start date of the last Sunday in March, but the end dates have differed. In 1981 and 1982the end dates were the fourth Sunday in October. In 1983the end date was changed to the last Sunday in September for all time zones other than Western European Time. In 1996the end date for all time zones was changed to the fourth Sunday in October. In 1998the end date was adjusted to be the last Sunday in October; this happened to be the same as the previous rule for 1996 and 1997. [cite web|title=History of legal time in Britain|author=Joseph Myers|url=http://www.srcf.ucam.org/~jsm28/british-time/|date=2007-01-21|accessdate=2007-03-24] The ninth directive, currently in force, has made this permanent. [cite web|url=http://europa.eu.int/smartapi/cgi/sga_doc?smartapi!celexapi!prod!CELEXnumdoc&lg=EN&numdoc=32000L0084&model=guichett|title=Directive 2000/84/EC of the European Parliament and of the Council of 19 January 2001 on summer-time arrangements]
Exact timing in the next several years
European Summer Time begins (clocks go forward) at 01.00 GMT on
Formula used to calculate the beginning of European Summer Time:
Sunday (31 - (5"y" ÷ 4 + 4) mod 7) March at 01.00 GMT
(valid through 2099 [Attributed to Robert H. van Gent. [http://webexhibits.org/daylightsaving/i.html "Daylight Saving Time: About this exhibit"] ] ), where "y" is the year, and for the nonnegative "a", "a" mod "b" is the
remainderof division after truncating both operands to an integer.
European Summer Time ends (clocks go backward) at 01.00 GMT on
Formula used to calculate the end of European Summer Time:
Sunday (31 - (5"y" ÷ 4 + 1) mod 7) October at 01.00 GMT
(validity as above).
For today these formulae yield a daylight saving time offset of Current_daylight_saving_offset_in_Europe (1 = summer time). [This number is automatically computed by the
Mediawikisoftware by checking whether today's date falls within the interval specified by the above formulae.]
In most of Europe the word "Summer" is added to the name of each European
time zoneduring this period: thus, in the GMT+1time zone, Central European Timebecomes Central European Summer Time( GMT+2).
United Kingdomlocal time during 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).
Ireland, local time during this period is known as "IST", which officially stands for "Irish Standard Time", not "Irish Summer Time". Ireland's official timezone is CET (UTC+1), but this only applies during the summer (when areas in Europe that use CET are in CEST), with clocks being moved back one hour for winter time (known variously in the country as WET, UTC or GMT).
All parts of Western Europe (except Iceland) (including Turkey), whether or not in the EU, use the EU rules forboth the date and the time of their clock changes.
Russia & Belarus
Russiaand Belarusobserve Summer Time and make the change forward and back on the same dates as the European Union (respectively, on the last Sunday in March and the last Sunday in October) – with the important difference, however, that the changeover on both dates takes place in Russia not at 01.00 GMT as in the rest of Europe, but at 02.00 " local time" (= 03.00 local daylight-saving time in October) in each time zone.
Daylight saving time
*cite book|author=David Prerau|url=http://savingthedaylight.com/|title=Saving the Daylight: Why We Put the Clocks Forward|publisher=Granta Books|isbn=1-86207-796-7
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Look at other dictionaries:
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