They used the Jewish Calendar in BCE (Before Common Era) or CE
(Common Era
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In the Thai solar calendar years are counted in the Buddhist era
which is 543 years greater than the Gregorian or Christian era,
therefore 2496 - 543 = 1953
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Common Era is also known by Current Era or Christian Era. It is
usually interchangeably used with the Latin word Anno Domini
(abbreviated as AD) and refers to the calendar era after the birth
of Jesus.