Thursday 01 Jan New Year's Day
Friday 02 Jan Special Holiday
Wednesday 04 Mar Makha Bucha Day
Monday 06 Apr Praphutthayotfachulalok, The Great and The Chakri Day
Monday 13 Apr Songkran Festival
Tuesday 14 Apr Songkran Festival
Wednesday 15 Apr Songkran Festival
Friday 01 May National Labour Day
Monday 04 May Special Holiday
Tuesday 05 May Coronation Day
Monday 01 Jun Wisakha Bucha Day
Wednesday 01 Jul Mid Year's Closing Day
Thursday 30 Jul Asarnha Bucha Day
Wednesday 12 Aug H.M. The Queen's Birthday
Friday 23 Oct King Chulalongkorn Memorial Day
Monday 07 Dec H.M. the King's Birthday (Substitution)
Thursday 10 Dec Constitution Day
Thursday 31 Dec New Year's Eve
Source: http://www.set.or.th/en/about/holidays/holidays_15.html