The day known as Christmas Day is celebrated on the 25th day of December. It is one of the most important days of the year for Christians, along with Easter when the death and resurrection of Jesus are celebrated. The season of preparing for Christmas is called Advent and begins on a Sunday about four weeks before Christmas. The Christmas Season (called Christmastide) ends 6 January or the Twelfth Day of Christmas, in which "Epiphany" is remembered.