From John Quiggin's Xmas message (posted in 2003, re-posted 2004):
CP Snow once said that most ancient British traditions dated back to the second half of the 19th century. The same idea recently popped up in the London Review of Books, with Stefan Collini referring to the
second half of the 19th century, the palaeolithic age of so many British cultural institutions.
Christmas provides an ideal illustration of this.
All the central features of Xmas date back, more or less exactly, to this period, including Christmas pudding, mince pies and cake, Christmas cards and Santa Claus. Although Dickens’ 1843 Christmas Carol, tiresomely readapted every couple of years since, presents a ‘traditional’ Christmas, it is much more accurate to see him as The Man who invented Christmas and his book as a work of invention.

