Buddhist calendar
Thailand mainly uses the Buddhist calendar, in which the calendar's epochal date (Year zero) was the year in which the Buddha attained "parinibbāna". This places the current year at 543 years ahead of the Gregorian calendar. The year 2021 CE is indicated as 2564 BE in Thailand. Despite adopting ISO 8601, Thai official date is still written in D/M/YYYY formats, such as 30 January 2564 BE (2021 CE) or 30/1/2564.