Thailand Public Holidays The Thai Calendar Thailand has adopted the western calendar to divide the year into days, weeks and months, using Thai names for these units. Years are numbered according to the Buddhist era (BE) which commenced 543 years before the Christian era. Therefore 2003 AD is BE 2546 and 2004 is BE 2547. National public holidays Thailand's national public holidays are linked to religious or agricultural traditions and follow the lunar calendar, therefore the dates for some of the holidays change each year. For the precise dates of the lunar holidays and festival locations, check www.tourismthailand.org   The following are national public holidays in Thailand :   New Year's Day : Jan 1   Makha Bucha Day : late January to early March   Chakri Day : April 6   Songkran Day : April 13   National Labour Day : May 1   Coronation Day : May 5   Visakha Bucha Day : May   Asanha Bucha Day : July   Khao Phansa (Buddhist Lent) : July   HM the Queen's Birthday : August 12   Chulalongkorn Day : October 23   HM the King's Birthday : December 5   Constitution Day : December 10   New Year's Eve : December 31