The 12 days of Christmas refer to the 12 days between Christmas and the Epiphany, which is the day when the Three Wise Men visited Jesus. The 12 days of Christmas are traditionally celebrated with various customs and traditions, including gift-giving, feasting, and caroling. The dates for the 12 days of Christmas are usually December 26th through January 5th, although this can vary depending on the year and the calendar used. The exact date of Epiphany can also vary, as it is calculated based on the astronomical position of the sun.