Sri Lanka and UN celebrate 60 year partnership 2015 marks the 70th anniversary of the founding of the United Nations on 24 October 1945, and the 60th anniversary of Sri Lanka becoming a member-state of the UN on 14 December 1955. Please follow and like us: Previous article Opening of the Embassy of Sri Lanka in Kabul, Afghanistan. Next article Opening of the Consulate General of Sri Lanka in Milan, Italy.