Thailand's official calendar uses the same months and days as the Gregorian calendar, with years counted in the Buddhist Era: add 543 to the Common Era year, so 2027 is BE 2570. Since 1941 (BE 2484) the year begins on 1 January; before that it began on 1 April, so the converter starts at 1941.
The traditional Thai new year, Songkran, is celebrated from 13 to 15 April. Buddhist holy days such as Makha Bucha and Visakha Bucha follow the Thai lunar calendar and change from year to year; see the public holidays page for this year's dates.
Questions
Good to know
What year is it in Thailand?
It is 2569 BE, the Gregorian year 2026 plus 543.
How do I convert BE to AD?
Subtract 543: BE 2570 is 2027. For a date before 1941, remember that the Thai year then began on 1 April.
When is Songkran?
Songkran is 13 to 15 April every year; the next starts on Tuesday, 13 April 2027.
Is the Thai calendar the same as other Buddhist calendars?
Not exactly. Sri Lanka, Myanmar, Cambodia and Laos also count Buddhist Era years, but some put the epoch one year differently and some keep lunisolar calendars. The +543 rule is Thailand's.