There is no birthday for the devil. According to Christian tradition, the angels were made and fell before linear time began.
The name of the devil is Lucifer, which means “Bringer of Light.” Christian tradition says that of all the angels, Lucifer was the most beautiful and powerful. God told the angels about his plan to make people, about how people would mess up, and about how his son Jesus Christ would come to save people. Lucifer didn’t want to help creatures that he thought were below him. Tradition and the Book of Revelation say that he got one-third of the angels to join his rebellion against God’s plan.
