Prior to 1 January 1901 - locations in Siam with an Astronomical Observatory would adopt the local mean time based on the Observatory's geographical position.
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Thailand declared that people would move their clocks ahead by 17-minutes 56-seconds to match the time in use in Southeast Asia (UTC+06:42:04 hrs and UTC+07:00:00 ahead of Greenwich Mean Time) on 31 March 1920.
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The Thai Standard Time is derived from 5-atomic clocks maintained by Royal Thai Navy.
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