" ???? In the beginning was the Word, and the Word was with God, and the Word was God. I take a slightly different POV."
John 1:14, "The Word became flesh and made his dwelling among us."
That's His birthday.
While they were there, the time came for the baby to be born, and she gave birth to her firstborn, a son. She wrapped him in cloths and placed him in a manger, because there was no room for them in the inn.
That's what happened on His birthday.