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The United Kingdom uses Greenwich Mean Time or Western European Time (UTC) and British Summer Time or Western European Summer Time (UTC+01:00). ==History== The United Kingdom used Local Mean Time until railway timetabling gradually established the two standards of Greenwich Mean Time and Dublin Mean Time (UTC-00:25, no longer used). These were officially adopted under the Statutes (Definition of Time) Act 1880 (43 & 44 Vict.). Daylight saving time was introduced by the Summer Time Act 1916 (6 & 7 Geo. V), which was implemented in 1916 as GMT plus one hour and Dublin Mean Time plus one hour. The length of DST could be extended by Order in Council, and was extended for the duration of World War I. For 1916, DST extended from 21 May to 1 October, with transitions at 02:00 standard time. On 1 October 1916, Greenwich Mean Time was introduced to Ireland. At the beginning of the 20th century, Sandringham Time (UTC+00:30) was used by the royal household. This practice was halted by King Edward VIII, in an effort to reduce confusions over time. Following the enactment of The Summer Time Act 1972 the last Sunday in March became the start of British Summer Time with the last Sunday in October being end of British Summer Time. 〔http://www.legislation.gov.uk/ukpga/1972/6〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Time in the United Kingdom」の詳細全文を読む スポンサード リンク
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