Christmas Price Index chose the items in the popular Christmas carol "The Twelve Days of Christmas" as its market basket: a partridge in a pear tree, two turtle doves, three French hens, four calling birds, five gold(en) rings, six geese, seven swans, eight maids, nine dancing ladies, ten leaping lords, eleven pipers, and twelve drummers. According to tradition, the purchasing of the items begins on December 26 and ends on January 6. PNC compiles both a "Christmas Price Index" and "The True Cost of Christmas." The "Christmas Price Index" is calculated by adding the cost of the items in the song. The "True
Twelve Days of Christmas Eve parties. Presently, the commercial practice treats the Solemnity of Christmas, 25 December, the first day of Christmas, as the last day of the "Christmas" marketing season, as the numerous "after-Christmas sales" that commence on 26 December demonstrate. The commercial calendar has encouraged an erroneous assumption that the Twelve Days "end" on Christmas Day and must therefore begin on 14 December. Many American Christians still celebrate the traditional liturgical seasons of Advent and Christmas, especially Amish, Anglo-Catholics, Episcopalians, Lutherans, Mennonites, Methodists, Moravians, Orthodox Christians, Presbyterians, and Roman Catholics. In Anglicanism, the designation of the "Twelve Days of Christmas" is used