Just when I thought I knew everything, someone comes along to humble me. Here's the question: How many "birthdays" are mentioned in the Bible? Not in the sense of people being born, but "birthday" in the sense of observance or celebration of one's birth, as we use the word today.
Think of a number.
Page down a bit for your answer.
Two. Pharaoh in the OT (Genesis 40) and Herod in the NT (Matthew 14.3-12 & Mark 6.21-29).
Pharaoh celebrates by hanging his baker, and Herod celebrates by decapitating John the Baptist. A good reason to avoid attending birthday parties.