Monday 3 Jan Substitution New Year's Day (Saturday 1 January)
Friday 18 Feb Makha Bucha Day
Wednesday 6 Apr Chakri Day
Wednesday 13 Apr Songkran Festival
Thursday 14 Apr Songkran Festival
Friday 15 Apr Songkran Festival
Monday 2 May Substitution for National Labour Day (Sunday 1 May)
Thursday 5 May Coronation Day
Monday 16 May Special Holiday
Tuesday 17 May Wisakha Bucha Day
Friday 1 July Mid Year's Closing Day
Friday 15 July Asarnha Bucha Day Effective from B.E. 2550 onwards, the Asarnha Bucha Day is
prescribed as a holiday, in replacement of the Buddhist Lent Day
Friday 12 Aug H.M. The Queen's Birthday
Monday 24 Oct Substitution for Chulalongkorn Day (Sunday 23 October)
Monday 5 Dec H.M. the King's Birthday
Monday 12 Dec Substitution for Constitution Day (Saturday 10 December)
Source: http://www.set.or.th/en/about/holidays/holidays_11.html