its difficult to say because his place of origin was unknown. he was thought to be 900 years old when he finally kicked the bucket. if he was “born” say on dagobah, then perhaps his birthday could be on the satunda of telona. but that’s just speculation, and assumes that dagobah experiences the same twin moon cycle (and thus calendrical) of coruscant.
conficius say, people in glass houses should not walk around in the nude.