Japan Standard Time

Last updated
Japan Standard Time
Time zone
UTC offset
JST UTC+09:00
Current time
22:50, 24 May 2022 JST [refresh]
Observance of DST
DST is not observed in this time zone.
Imperial Ordinance 167 issued on December 27, Meiji 28 (1895). Imperial Ordinance 167 issued on December 27, Meiji 28 (1895).png
Imperial Ordinance 167 issued on December 27, Meiji 28 (1895).

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 (i.e. it is UTC+09:00). [1] Japan does not observe daylight saving time, though its introduction has been debated on several occasions. During World War II, the time zone was often referred to as Tokyo Standard Time.


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).


Before 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. As modern transportation methods, such as trains, were 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 behind the time in Tokyo. In 1886, Ordinance 51 was issued in response to this problem, which stated:

Ordinance 51 (on the precise calculation of time using the Prime Meridian) – July 13, 1886

Akashi Municipal Planetarium, located exactly on 135degE longitude, and known as a symbol of Japan Standard Time. Akashi Minicipal Planetarium.JPG
Akashi Municipal Planetarium, located exactly on 135°E longitude, and known as a symbol of Japan Standard Time.

According to this, the standard time (標準時, Hyōjunji) 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 time zone would be in effect from 1888. 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 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. [3] 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.

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. [4] 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.

Between 1948 and 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 (with the exception of 1949, when the spring forward transition was the first Sunday in April). [5] More recently there have been efforts to restore daylight saving time in Japan but these have not succeeded. [6] [7]

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. [8]

Time zones of the Japanese Empire

The two-time-zone system was implemented in Japan between January 1896 and September 1937:

Time offsetNameJapaneseRomanizationRegion
GMT+08:00Western Standard Time西部標準時Seibu HyōjunjiWestern Okinawa and Taiwan (see also Time in Taiwan)
GMT+09:00Central Standard Time中央標準時Chūō HyōjunjiJapan mainland and Korea (see also Korea Standard Time)

From October 1937, Central Standard Time was also used in western Okinawa and Taiwan.

IANA time zone database

The IANA time zone database contains one zone for Japan in the file zone.tab, named Asia/Tokyo.

Daylight saving time in Japan

From 1948 to 1952, Japan observed daylight saving time (DST) between May and September every year. The United States imposed this policy as part of the Allied occupation of Japan. In 1952, three weeks before the occupation ended, the Japanese government, which had been granted increased powers, abolished daylight saving time, and the Allied occupation authorities did not interfere. [9] Since then, DST has never been officially implemented nationwide in Japan. [10]

Starting in the late 1990s, a movement to reinstate DST in Japan gained some popularity, aiming at saving energy and increasing recreational time. The Hokkaido region is particularly in favour of this movement because daylight starts as early as 03:30 (in standard time) there in summer due to its high latitude and its location near the eastern edge of the time zone, with much of the region's solar time actually closer to UTC+10:00. Because of this, the sun sets shortly after 19:00 in much of the eastern part of the country (in Tokyo, the latest sunset of the entire year is 19:01, from 26 June to 1 July, despite being at 35°41'N latitude). Since 2000, a few local governments and commerce departments have promoted unmandated hour-earlier work schedule experiments during the summer without officially resetting clocks. [11]

The Council on Economic and Fiscal Policy of the Cabinet Office is expected[ when? ](written October 2013) to propose that the Japanese government begin studying DST in an attempt to help combat global warming. Japanese Prime Minister Shinzō Abe made a significant effort to introduce daylight saving time, but was ultimately unsuccessful. [12] However, it is not clear that DST would conserve energy in Japan. A 2007 simulation estimated that introducing DST to Japan would increase energy use in Osaka residences by 0.13%, with a 0.02% saving due to lighting more than outweighed by a 0.15% increase due to cooling costs; the simulation did not examine non-residential buildings. [13]

See also

Related Research Articles

Unno Jūza or Unno Jūzō was the pen name of Sano Shōichi, the founding father of Japanese science fiction. He was born to a family of medical doctors in Tokushima city. In 1928 he opened his writer’s career with The case of the mysterious death in the electric bath.

Akio Ōtsuka Japanese actor

Akio Ōtsuka is a Japanese actor, voice actor and narrator from the Tokyo Metropolitan area. He is attached to Mausu Promotion.


Kujiki (旧事紀), or Sendai Kuji Hongi (先代旧事本紀), is a historical Japanese text. It was generally believed to have been one of the earliest Japanese histories until the middle of the Edo period, when scholars such as Tokugawa Mitsukuni successfully contended that it was an imitation based on the Nihon Shoki, the Kojiki and the Kogo Shūi. Scholarship on the Kujiki generally considers it to contain some genuine elements, specifically that Book 5 preserves traditions of the Mononobe and Owari clans, and that Book 10 preserves the earlier historical record the Kokuzō Hongi.

National Route 395 is a Japanese national highway connecting the cities of Kuji and Ninohe. The 58.0-kilometer-long (36.0 mi) highway begins at Kuji Interchange where it meets National Route 45, the Sanriku-kita Jūkan Road, and the Hachinohe-Kuji Expressway in Kuji. It travels northwest across the northeastern corner of Iwate Prefecture to Ninohe where it ends at an intersection with National Route 4.

The Japanese Film Festival is a film festival held in Singapore and dedicated to Japanese cinema. It was held annually from 1999 to 2016, and curated with Singapore audiences in mind, led by local programmers with a wide-ranging programme of film classics, Japanese independents and commercial releases. There was no festival in 2017. Under new direction from 2018 from the Japan Foundation in Tokyo, it has shifted its focus to screening mainly commercial releases from Japan.

Time in Taiwan

National Standard Time is the official time zone in Taiwan defined by an UTC offset of +08:00. This standard is also known as Taipei Time (臺北時間) or Taiwan Time (臺灣時間).

Road signs in Japan Overview of road signs in Japan

In Japan, road signs are standardized by the "Order on Road Sign, Road Line, and Road Surface Marking (道路標識、区画線及び道路標示に関する命令)" established in 1968 with origins from the Tokyo Metropolitan Police Department's "Order on Standardization of Road Sign" of 1934 and the Home Ministry of Japan's "Order on Road Signs" of 1942. The previous designs have been used since 1986 after several amendments of order.

A Gokoku Shrine is a shrine dedicated to the spirit (Eirei) of those who died for the nation, renamed from shōkonsha in 1939. Before World War II, they were under the jurisdiction of the Ministry of the Interior, but after World War II they are administered by an independent religious corporation. Designated Gokoku Shrines were built in prefectures except Tokyo and Kanagawa Prefecture. The main deities are war dead from the prefecture or those who are related to them, as well as self-defense officers, police officers, firefighters, and others killed in the line of duty.

Haru Asada was the Japanese concubine of Sun Yat-sen, the founder of the Republic of China.

Imperial Japanese Navy ship classifications went through various changes between 1871 and 1945, as technology changed and new ship classes were added while those that became obsolete were discontinued. There were efforts to translate some ships' classes that were imported or in use by other navies, while incorporating any classification system into Japanese language conventions and maintaining an internal consistency.

Nihon Bijutsu Token Hozon Kyokai

The Nihon Bijutsu Tōken Hozon Kyōkai is a public interest incorporated foundation established in February 1948 to preserve and promote Japanese swords that have artistic value. They run a Japanese Sword Museum in Tokyo and have a secretariat in the building.

Yuki Kato (geisha)

Yuki Kato (加藤ユキ), also known as Morgan O-Yuki (モルガンお雪), was a Japanese geisha who married George Denison Morgan, nephew of Pierpont Morgan of the Morgan banking dynasty.

Takafusa Nakamura was a Japanese economist who was a specialist in the Japanese economy.

A miscellaneous school is a classification of schools under the education laws of Japan and South Korea.

Tokyo Watanabe Bank, originally named the Twenty-Seventh National Bank, was a commercial bank based in Tokyo, Japan.

Maruoka Kanji was Governor of Okinawa Prefecture (1888–1892) and governor of Kōchi Prefecture (1892).

Sendai University Meisei High School Private school

Sendai University Meisei High School is a private high school located in Sendai, Miyagi, Japan. Founded in 1879 as the Shoso Private School, it is the oldest high in Miyagi Prefecture.

Wang Renyuan was a Chinese-born politician affiliated with the Kuomintang. He served in the Second Sino-Japanese War and was elected to political office in 1946. After the government of the Republic of China relocated to Taiwan, Wang served as Minister of Justice from 1970 to 1976.

The term Unity of ritual and government refers to the unification of ritual and politics. Festival in festival-politics means "festival" and religion. The word "politics" means "festival" and politics.


  1. Time and Date (13 September 2020). "Current Local Time in Japan" . Retrieved 12 September 2020. There is a difference between GMT and UTC which can be as much as 0.9 seconds. Japan now legally uses an atomic clock synchronized to UTC.
  2. 明治十九年勅令第五十一号(本初子午線経度計算方及標準時ノ件)
    • 英国グリニツチ天文台子午儀ノ中心ヲ経過スル子午線ヲ以テ経度ノ本初子午線トス
    • 経度ハ本初子午線ヨリ起算シ東西各百八十度ニ至リ東経ヲ正トシ西経ヲ負トス
    • 明治二十一年一月一日ヨリ東経百三十五度ノ子午線ノ時ヲ以テ本邦一般ノ標準時ト定ム
  3. 明治二十八年勅令第百六十七號(標準時ニ關スル件) - Wikisource
  4. 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
  5. Paul Eggert; Arthur David Olson (2007-03-13). "Sources for time zone and daylight saving time data". Archived from the original on 2012-06-23. Retrieved 2007-03-23.
  6. "Outline of the report on the National Conference on the Global Environment and Summer Time". The Energy Conservation Center, Japan. September 1998. Archived from the original on 2007-04-09. Retrieved 2007-04-14.
  7. Hongo, Jun, "Daylight saving: Is it finally time to convert?", Japan Times , 28 June 2011, p. 3.
  8. Preston Phro (24 May 2013). "Gov't considers setting clock ahead by two hours". Japan Today. Retrieved 24 June 2020.
  9. Schreiber, Mark (28 April 2002). "Japan's 'long-awaited spring'". Japan Times. Tokyo. Retrieved 13 September 2020.
  10. Hongo, Jun, "Daylight saving: Is it finally time to convert?", Japan Times , 28 June 2011, p. 3.
  11. Thousands in Japan Adopt “Daylight Saving” Plan
  12. "Panel to call for daylight saving time". Yomiuri Shimbun. 2007-06-02. Archived from the original on 2007-06-06. Retrieved 2007-06-02.
  13. Yoshiyuki Shimoda; Takahiro Asahia; Ayako Taniguchia; Minoru Mizuno (2007). "Evaluation of city-scale impact of residential energy conservation measures using the detailed end-use simulation model". Energy. 32 (9): 1617–1633. doi:10.1016/j.energy.2007.01.007.