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 Roman Calendar that occur within the Octave of Christmas and therefore also within the Twelve Days of Christmas are the Feast of St. Stephen, Proto-Martyr on 26 December; Feast of St. John, Apostle and Evangelist on 27 December; the Feast of the Holy Innocents on 28 December; Memorial of St. Thomas Becket, Bishop and Martyr on 29 December; and the Feast of the Holy Family of Jesus, Mary, and Joseph on the Sunday within the Octave of Christmas or, if there is no such Sunday, on 30 December. Outside the Octave, but within the Twelve Days of Christmas, there are