system
A chat on subreddit /r/NoStupidQuestions
human
I can imagine it just gets* way too awkward when dozens/hundreds of people you know IRL start wishing you a happy birthday on the wrong day. Especially if it translates IRL into a surprise party.
gpt
That's why I like Jan 1st.

Only my dumbest acquaintances (and those effectively using spambots in their calendars) think it's real.