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Japan Standard Time or JST ( ''Nihon Hyōjunji'' or ''Chūō Hyōjunji'') is the standard timezone in Japan, and is 9 hours ahead of UTC, i.e. it is UTC+09:00. There is no daylight saving time, though its introduction has been debated several times. During World War II, it was often called Tokyo Standard Time. Japan Standard Time is the same as Korean Standard Time, Indonesian Eastern Standard Time and Yakutsk Time. ==History== Before the Meiji era (1868–1912), each local region had its own timezone in which noon was when the sun was exactly at its zenith. As modern transportation like trains was adopted, this practice became a source of confusion. For example, there is a difference of about 5 degrees longitude between Tokyo and Osaka and because of this, a train that departed from Tokyo would arrive at Osaka 20 minutes ahead of the time in Tokyo. In 1886, Ordinance 51 was issued in response to this problem, which stated: According to this, the was set 9 hours ahead of GMT (UTC had not been established yet). In the ordinance, the first clause mentions GMT, the second defines east longitude and west longitude and the third says the standard timezone would be in effect from 1888. Coincidentally, the city of Akashi in Hyōgo Prefecture is located exactly on 135 degrees east longitude and subsequently became known as ''Toki no machi'' (Town of Time). With the annexation of Taiwan in 1895, Ordinance 167 (pictured on the right) was issued to rename the previous Standard Time to and establish new at 120° longitude as timezone for the Japanese Miyako and Yaeyama Islands, as well as Taiwan and its Penghu Islands.〔(明治二十八年勅令第百六十七號（標準時ニ關スル件） - Wikisource )〕 While Korea came under Japanese rule in 1910, Korea Standard Time of UTC+8:30 continued to be used until 1912, when it was changed to Central Standard Time. Western Standard Time, which was used in Taiwan and some parts of Okinawa, was abolished by ordinance 529 in 1937 and replaced by Central Standard Time in those areas.〔(昭和十二年勅令第五百二十九號（明治二十八年勅令第百六十七號標準時ニ關スル件中改正ノ件） - Wikisource )〕 Territories occupied by Japan during World War II, including Singapore and Malaya, adopted Japan Standard Time for the duration of their occupation, but reverted after Japan's surrender. In 1948–1951 occupied Japan observed daylight saving time (DST) from the first Sunday in May at 02:00 to the second Saturday in September at 02:00, except that the 1949 spring-forward transition was the first Sunday in April. More recently there have been efforts to bring back DST in Japan, but so far this has not happened.〔Hongo, Jun, "(Daylight saving: Is it finally time to convert? )", ''Japan Times'', 28 June 2011, p. 3.〕 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「Japan Standard Time」の詳細全文を読む スポンサード リンク
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