FESTIVE COUNTDOWN When are the 12 days of Christmas, what does each day of Twelvetide mean and when does it start and end? – The SUN December 6, 2017 by Fulcrum The 12 days of Christmas, also known as Twelvetide, is a Christian festive celebration of the Nativity of Jesus Christ Natalie Keegan.The SUN 5 December 2017 FulcrumShareTweetShare