In 1940, Thailand moved its New Year's Day from April 13th to January 1st. The old New Year is still a holiday called Songkran. Years are counted as the Buddhist era (B.E.) which started 543 years earlier than the Christian era, therefore 2005 A.D. is the year 2548 B.E.

Most Buddhists festival and hlidays follow the lunar calendar so their actual dates according to the Gregorian calendar vary from year to year.