Over here in England, although I don't know how many follow these dates, it's traditional to put the Christmas Decorations up on the night of the 12th December. They usually stay up until the 6th of January.
But, this year we will be leaving them up a bit longer as my son comes home from Afghanistan in the new year... he wants the Christmas decorations up... presents around the tree and a full Christmas Dinner with all the family... whatever date he lands.
So tradition will be flying out the window this year