Unless you do not celebrate Christmas, in which case merry day off with pay.
Unless you have to work, in which case merry day at work with overtime AND holiday pay.
Unless your employer does not offer overtime for working holidays - in which case I hope said employer gets a lump of coal. And not the good kind of a lump of coal. Oh no - I am talking a lump of coal shoved somewhere that you do not want the coal to be.
But anyhow - I am straying from the point here.