I think there may be a bit of confusion here!

Bitcoin's "birthday" is actually October 31, 2008, when an individual or group using the pseudonym Satoshi Nakamoto published the Bitcoin whitepaper. This is considered the birthdate of the concept and protocol that would eventually become Bitcoin.

However, the first block of the Bitcoin blockchain, known as the Genesis Block, was mined on January 3, 2009. Some people consider this date to be the actual "birthday" of Bitcoin.

So, if I were to celebrate Bitcoin's birthday, it would be either October 31 or January 3!