What is what year is it in thailand?

As of September 2021, it is the year 2564 in Thailand. The Thai calendar is based on the Buddhist Era, which is 543 years ahead of the Gregorian calendar. This means that the current year in Thailand is 2564 BE (Buddhist Era) or 2021 AD in the Gregorian calendar. The change in the calendar is based on the legend of the Buddha's birth, which is traditionally believed to have occurred in 543 BCE.