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The Thai solar calendar (Thai: ปฏิทินสุริยคติไทย, RTGS: patithin suriyakhati thai, "solar calendar") was adopted by King Chulalongkorn (Rama V) in 1888 CE as the Siamese version of the Gregorian calendar, replacing the Thai lunar calendar as the legal Thai calendar (though the latter is still also used, especially for traditional and religious events). Years are now counted in the Buddhist Era (B.E.): พุทธศักราช, พ.ศ. RTGS: Phutthasakkarat (lit. 'era of the Shaka Buddha') which is 543 years ahead of the Gregorian calendar.