Monday 02 Jan Substitution for New Year’s Eve (Saturday 31 December 2011)
Tuesday 03 Jan Substitution for New Year’s Day (Sunday 1 January 2012)
Wednesday 07 Mar Makha Bucha Day
Friday 06 Apr Chakri Day
Monday 09 Apr Special Holiday
Friday 13 Apr Songkran Festival
Monday 16 Apr Substitution for Songkran Festival (Saturday, 14 April 2012 and Sunday, 15 April 2012)
Tuesday 01 May National Labor Day
Monday 07 May Substitution for Coronation Day (Saturday, 5 May 2012)
Wednesday 09 May Ploughing Ceremony Day
Monday 04 Jun Wisakha Bucha Day
Thursday 02 Aug Asarnha Bucha Day
Monday 13 Aug Substitution for H.M. the Queen’s Birthday (Sunday, 12 August 2012)
Tuesday 23 Oct Chulalongkorn Day
Wednesday 05 Dec H.M. the King's Birthday
Monday 10 Dec Constitution Day
Monday 31 Dec New Year's Eve
Source: http://thailand.prd.go.th/view_around_thailand.php?id=5807