This forum does have an automated add on that will create a new celebratory thread for any user who has been a member of the site for more than 7 days and who have been active in the last 60 days. As a friendly community, it's nice to get greetings from your friends on your happy day and let them offer you a virtual drink
The Birthday Posting tool does not have a crystal ball. It can only work if you have entered your birth date in your user profile, but this information can become visible to other forum users.
It isn't compulsory to have a birthday thread. You might not wish to enter your birth date for privacy reasons. That's fine by us