The Twelve Days of Christmas are the festive days beginning Christmas Day (25 December). This period is also known as Christmastide and Twelvetide.
Unfortunately,because there a drive to start the “christmas selling period” there is a misunderstanding that Christmas ends promptly on Christmas Day. That is 100% wrong.
The Twelfth Night of Christmas is always on the evening of 5 January, but the Twelfth Day can either precede or follow the Twelfth Night according to which Christian tradition is followed.Twelfth Night is followed by the Feast of the Epiphany on 6 January. In some traditions, the first day of Epiphany (6 January) and the twelfth day of Christmas overlap.