When did New Year's Day become a national holiday?

Well im not sure about the UK as we just followed the Americans with ''thanksgiving'' holidays. I think George Washington called for the first national Thanksgiving Day on November 26, 1789, after the independence of the United States was assured. But it took the Civil War to put Thanksgiving on the calendar for good, beginning with President Lincoln's proclamation in 1863 of a Thanksgiving Day at the end of November.