"The Church does not superstitiously observe days, merely as days, but as memorials of important facts. Christmas might be kept as well upon one day of the year as another; but there should be a stated day for commemorating the birth of our Saviour, because there is danger that what may be done on any day, will be neglected." -- Samuel Johnson
To my Russian Orthodox friends (and folks of any other old-calendar denominations[*]), Merry Christmas!
[*] I don't know whether any of the Orthodox folks I know who aren't Russian Orthodox are old-calendrists as well, but if so, Merry Christmas to you as well!