Day Date Month Holiday Thursday 12 Jan Duruthu Full Moon Poya Day Saturday 14 Jan Tamil Thai Pongal Day Saturday 04 Feb National Day Friday 10 Feb Navam Full Moon Poya Day Friday 24 Feb Mahasivarathri Day Sunday 12 Mar Madin Full Moon Poya Day Monday 10 Apr Bak Full Moon Poya Day Wednesday 12 Apr Sinhala and Tamil New Year's Eve Thursday 13 Apr Sinhala and Tamil New Year's Day Friday 14 Apr Good Friday Monday 01 May Labour Day Wednesday 10 May Vesak Full Moon Poya Day Thursday 11 May Day after Vesak Full Moon Poya Day Friday 09 Jun Poson Full Moon Poya Day Monday 26 Jun Eid-al-Fitr (End of Ramadan) Saturday 08 Jul Adhi Esala Full Moon Poya Day Monday 07 Aug Nikini Full Moon Poya Day Saturday 02 Sep Eid-al-Adha (Feast of Sacrifice) Tuesday 05 Sep Binara Full Moon Poya Day Thursday 05 Oct Vap Full Moon Poya Day Wednesday 18 Oct Deepavali Friday 03 Nov Il Full Moon Poya Day Friday 01 Dec Milad-Un-Nabi (Holy Prophet's Birthday) Sunday 03 Dec Unduvap Full Moon Poya Day Monday 25 Dec Christmas Day Source: https://www.timeanddate.com/holidays/sri-lanka/2017#!hol=9