On Christmas Day. As I understand it, "at Christams" But when we want to indicate only one day we say "on the first day of Christmas" or "on Easter sunday". His date of birth is unknown.

I would add that I suspect this stems from the days when Christmas was always treated as a twelve-day festival. on Christmas holiday OR in Christmas holiday OR at Christmas holiday OR on Xmas day or. Christmas Day is the favourite day for children. We say "On Christmas Day," but never "on Christmas." I hope that helps.
Christmas, Christian festival celebrating the birth of Jesus.
I would add that I suspect this stems from the days when Christmas was always treated as a twelve-day festival. on Christmas holiday OR in Christmas holiday OR at Christmas holiday OR on Xmas day or.
Christmas Day is an annual Christian festival commemorating the birth of Jesus Christ, the Son of God. Many homes have Christmas trees and. His date of birth is unknown.





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