The Thai solar calendar, Suriyakati (สุริยคติ: Suriya plus kati : way) was adopted by King Chulalongkorn (Rama V) in 1888 as the Siamese version of the Gregorian calendar. It is the official calendar in Thailand, though Thai lunar calendar dates continue in use. Years are counted in the Buddhist Era (póota sàk-gà-râat พุทธศักราช พ.ศ.) that is 543 years greater than the Christian Era (krít sàk-gà-râat คริสต์ศักราช ค.ศ.) As a convenience, calendars typically include the Christian Era (AD) in both Chinese and Arabic numerals.


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