Likely, it's not his original Birthday. But I won't miss the chance to wish him a Happy Birthday, be it whenever.
Happy Birthday, legend.
Looks like you have to manually enter a date for your birthday so maybe it is his actual birthday? Regardless, happy birthday Hhampuz.
This is still an anonymous forum on the Internet, anyone can enter random information about themselves. You can also manually enter a random date. This is most often a requirement only for the reason of confirming the age of 18+, or what minimum is already prescribed, to protect the forum from access by minors.
To me, threads like this dedicated to managers always sound like a desire to cement a place in their campaigns.