Since AD 1888, under the reign of King Rama V, Thailand has adopted the Thai Solar Calendar, which has some differences with the common calendar, also known as Gregorian Calendar. Years are counted according to the Buddhist Era, that is 543 years greater than the Gregorian calendar used in western countries.
Right now, the year is
Converting between them is as easy as adding or extracting 543 years, but why should you bother doing so, when you can a machine do it for you? Just start typing on the box the Thai year to obtain the Gregorian one, and vice versa.
Now that you are aware of this, why not take a look at other articles?