The Twelve Days of Christmas, and the associated
evenings of those twelve days (Twelve-tide), are the festive days beginning the
evening of Christmas Day (December 25)
through the morning of Epiphany (January 6).
The associated evenings of the twelve days begin on the evening before the
specified day. Thus, the first night of Christmas is December 25–26 and Twelfth Night is January 5–6. This period
is also known as Christmastide.