In the liturgical calendar, Christmastide, also known as the Christmas season, traditionally lasts for 12 days, beginning on December 25th, Christmas Day, and ending on January 5th, the day before the Feast of the Epiphany on January 6th. However, in some Christian denominations, the celebration of Christmastide may extend beyond Epiphany, concluding with the Feast of the Baptism of the Lord, which falls on the Sunday after January 6th. This can lead to Christmastide lasting for either up to 12 or 20 days, depending on the specific liturgical tradition.