My birth day on facebook is not my real birth day. My daughter pinged me one day and said, “Today isn’t your birthday”.
i.e. the downside is that everyone is wishing me a happy birthday when it’s not my birthday. I don’t care.
Ditto.
The queen of England has two birth days, why not you too?
That's not a bad idea. And as long as you get birthday greetings once a year, it will all even out anyway.