when was the last time christmas was on a sunday

Christmas last fell on a Sunday in the year 2012. It is unusual for Christmas to fall on a Sunday, as it is more commonly celebrated on a Monday or Tuesday. This is because Christmas is typically celebrated on December 25th, and the Gregorian calendar, which we use today, sets December 25th as a Monday every 11 years and a Tuesday every 33 years. This means that it is rare for Christmas to fall on a Sunday, as it only happens once every 28 years.