Eastern part of Hokkaido is over 30 minutes behind and western part of Ryukyu islands is over 30 minutes ahead of local solar time as a single standard time offset of UTC+09:00 is observed in whole country of Japan, even in its easternmost territory, Minamitorishima (153★9′E) and its westernmost territory, Yonaguni (122★6′E). The IANA time zone database contains one zone for Japan in the file zone.tab, named Asia/Tokyo.ĭaylight saving time in Japan This map shows the difference between legal time and local mean time in Japan and its neighborhood. Japan mainland and Korea (see also Korea Standard Time)įrom October 1937, Central Standard Time was also used in western Okinawa and Taiwan. Western Okinawa and Taiwan (see also Time in Taiwan) The two-time-zone system was implemented in Japan between January 1896 and September 1937: In May 2013, former Tokyo governor Naoki Inose proposed permanently moving the country’s time zone ahead by 2 hours to better align global markets and make Japan’s stock market to be the first to open in the world at any given time. More recently there have been efforts to restore daylight saving time in Japan but these have not succeeded. 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.īetween 19 occupied Japan observed daylight saving time (DST) from the first Saturday in May at 24:00 to the second Saturday in September at 24:00 (with the exception of 1949, when the spring forward transition was the first Saturday in April at 24:00). 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. While Korea came under Japanese rule in 1910, Korea Standard Time of GMT+08:30 continued to be used until 1912, when it was changed to Central Standard Time. With the annexation of Taiwan in 1895, Ordinance 167 (pictured on the right) was issued to rename the previous Standard Time to Central Standard Time ( 中央標準時, Chūō Hyōjunji ) and establish a new Western Standard Time ( 西部標準時, Seibu Hyōjunji ) at 120° longitude as the time zone for the Japanese Miyako and Yaeyama Islands, as well as Taiwan and its Penghu Islands. 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). In the ordinance, the first clause mentions GMT, the second defines east longitude and west longitude and the third says the standard time zone would be in effect from 1888. Īkashi Municipal Planetarium, located exactly on 135☎ longitude, and known as a symbol of Japan Standard TimeĪccording to this, the standard time ( 標準時, hyōjunji ) was set 9 hours ahead of GMT (UTC had not been established yet). On January 1, 1888, 135 degrees east longitude will be set as the standard meridian for all of Japan, allowing precise times to be fixed. ![]() Positive degrees are east, negative degrees are west. Longitudes are calculated using the prime meridian, counting 180 degrees either east or west.The prime meridian passes through England's Greenwich Observatory.Ordinance 51 (on the precise calculation of time using the Prime Meridian) – July 13, 1886 In 1886, Ordinance 51 was issued in response to this problem, which stated: 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 behind the time in Tokyo. As modern transportation methods, such as trains, were adopted, this practice became a source of confusion. Japan Standard Time is equivalent to Korean Standard Time, Pyongyang Time ( North Korea), Eastern Indonesia Standard Time, East-Timorese Standard Time and Yakutsk Time ( Russia).īefore the Meiji era (1868–1912), each local region had its own time zone in which noon was when the sun was exactly at its culmination. ![]() During World War II, the time zone was often referred to as Tokyo Standard Time. Japan does not observe daylight saving time, though its introduction has been debated on several occasions. Japan Standard Time ( 日本標準時, Nihon Hyōjunji, JST), or Japan Central Standard Time ( 中央標準時, Chūō Hyōjunji, JCST), is the standard time zone in Japan, 9 hours ahead of UTC ( UTC+09:00). Imperial Ordinance 167 issued on December 27, Meiji 28 (1895) For the TV series, see Japan Time (TV series).
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