Time in Taiwan

National Standard Time

National Standard Time digital clock of Bureau of Standards, Metrology and Inspection (BSMI), Taiwan.
Traditional Chinese 國家標準時間
Simplified Chinese 国家标准时间

National Standard Time (Chinese: 國家標準時間; pinyin: Guójiā Biāozhǔn Shíjiān; Pe̍h-ōe-jī: Kok-ka Piau-chún Sî-kan, see below) is the official time zone in Taiwan defined by an UTC offset of +08:00. This standard is also known as Taiwan Time (臺灣時間), Taipei Time (臺北時間) and historically as Chungyuan Standard Time (中原標準時間) until the early 2000s. [1]


History of time standard in Taiwan
DateNameCharacterRomanizationTime offset
Jan. 1, 1896 – Sep. 30, 1937Western Standard Time西部標準時Seibu HyōjunjiUTC+08:00
Oct. 1, 1937 – Sep. 20, 1945Central Standard Time中央標準時Chūō HyōjunjiUTC+09:00
Sep. 21, 1945 – Oct. 25, 1945Western Standard Time西部標準時Seibu HyōjunjiUTC+08:00
Oct. 25, 1945 – Early 2000sChungyuan Standard Time中原標準時間Zhōngyuán Biāozhǔn ShíjiānUTC+08:00
From the 2000sNational Standard Time國家標準時間Guójiā Biāozhǔn ShíjiānUTC+08:00

The first time zone standard in Taiwan was enforced in January 1, 1896, the second year of Taiwan under Japanese rule. The standard is called Western Standard Time (西部標準時) with time offset of UTC+08:00, based on 120°E longitude. In October 1, 1937, the Western Standard Time zone is abolished and the Central Standard Time (中央標準時), with time offset of UTC+09:00, was enforced in the entire country of Japan including Taiwan. This time was used until the end of the Second World War. In September 21, 1945, the Governor-General of Taiwan announced to revoke the order in 1937.[2]

After the war's end, Taiwan was annexed to the five time zones system of the Republic of China and was classified in the Chungyuan Standard Time (中原標準時間) with time offset of UTC+08:00. After the Chinese Civil War in 1949, the Central Government of the Republic of China retreated to Taiwan and lost nearly all the territory of mainland China. From this time, the five time zones system was no longer implemented except Chungyuan Standard Time on Taiwan. After the 1990s, the democratization movement brought more localization thinking in Taiwan. The term Chungyuan (Zhongyuan), which means the Central Plain of China, is considered as Sinocentrism. Thus the government on Taiwan now favors the term National Standard Time (國家標準時間) as official use. Along with the governmental standard, popular alternatives include Taiwan Standard Time (臺灣標準時間), Taipei Time (臺北時間) and Formosan Time (寶島時間).

Daylight saving time was implemented in Taiwan after the Second World War on the summer of 1946–1961, 1974, 1975, 1979. [3]

Present development

National Standard Time is now managed by the Bureau of Standards, Metrology and Inspection (BSMI) under the Ministry of Economic Affairs.[4] The time is released according to the caesium atomic clocks aggregated by National Standard Time and Frequency Laboratory under Chunghwa Telecom after consulting the data provided by Bureau International des Poids et Measures.[5][6]

National Standard Time used in Taiwan is also the same as Brunei, P.R.China (including Hong Kong and Macau), Malaysia and Singapore.

IANA time zone database

The IANA time zone database contains one zone for Taiwan, named Asia/Taipei.

c.c.*coordinates*TZ*comments*Standard timeSummer time
TW +2503+12130 Asia/Taipei UTC+08:00

See also


  1. 仝澤蓉 (2005-01-12). 標準局:沒有「中原」標準時間 (in Chinese). Archived from the original on December 5, 2005. Retrieved 9 月9日 2008. Check date values in: |access-date= (help)
  2. wikisource:ja:臺灣ノ標準時ニ關スル件 (昭和二十年台湾総督府告示第三百八十六号)
  3. Yu-Cheng Chuang (Jul 11, 2014) [台灣日光節約時間之考據 https://blog.yorkxin.org/posts/2014/07/11/dst-in-taiwan-study/]
  4. "National Standard Time and Frequency Laboratory" (in Chinese). Archived from the original on 31 December 2005. Retrieved 9 January 2006.
  5. Calvin Lin (November 1998). 時間網站 - 秒的由來 (in Chinese). Retrieved 9 January 2006.
  6. "National Standard Time and Frequency Laboratory - History and Introduction" (in Chinese). Retrieved 9 January 2006.
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