"Oh, I've done basically that in the past. Sometimes if I just feel like having a party and can't think of a decent enough excuse I tell people it's my birthday party. Not that you need an excuse for a party, but you know what I mean. It just, y'know, would be kind of fun to know when the actual days are. If the mansion spirits are aware of it themselves1." Choosing random dates every year definitely feels like something that's easier to get away with when you're constantly traveling and rarely around the same people long enough and constant enough for them to get invited twice. He is aware that this is a distinct improvement in his life as a whole, but it does make pretending to have a birthday harder.
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1. Nope.