Time in Thailand

Thailand follows UTC+07:00, which is 7 hours ahead of UTC. The local mean time in Bangkok was originally UTC+06:42:04.[1] Thailand used this local mean time until 1920, when it changed to Indochina Time, UTC+07:00; ICT is used all year round as Thailand does not observe daylight saving time. Thailand shares the same time zone with Vietnam, Cambodia, Laos, Christmas Island, and Western Indonesia.


Period in use Time offset from GMT Name of time (unofficial)
1 January 1880 - 31 March 1920 UTC+06:42:04 Bangkok Mean Time
1 April 1920 – present UTC+07:00 Indochina Time (ICT)

Standardisation of time in Thailand

Thailand declared on 16 March 1920 that people would move their clocks ahead by 17 minutes, 56 seconds on 31 March 1920 to match the time in use in Southeast Asia. The time was switched on 1 April 1920 at 00:00 (old time) to 00:17:56 (new time).[4]


On 1 January 1990, the Cabinet of Thailand appointed the Royal Thai Navy as the official timekeeper for Thailand. Thai Standard Time is derived from five atomic clocks maintained by the Royal Thai Navy.

See also


  1. "Time Zone & Clock Changes in Bangkok, Thailand". www.timeanddate.com. Retrieved 2021-02-20.
  2. Arnold, Wayne (28 July 2001). "Thailand's Leader Wants to Switch Time Zones". New York Times. Retrieved 2 July 2019.
  3. Mok Ly Yng. "What time is it really?". Mathematics Department, National University of Singapore. Retrieved 2 July 2019.
  4. "พระราชกฤษฏีกาให้ใช้เวลาอัตรา" (PDF). Royal Thai Government Gazette (in Thai). Retrieved 4 June 2020.
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