Character creation birthday bug

[ZhangoSqu]

This is not bug to begin with. Calendar where you choose date is Eorzean calendar, below you're shown date you chose in Earth calendar. Who ever said that dates in Eorzean calendar and Earth calendar should match?

As far as I understood you're not shown the earth date, the date you're shown is just a different format representation of the long form based on your selection. For instance the Fifth Astral moon shows the selection of the 20th sun as 9/19t; the Eorzean calendar is composed of 12 months, with 32 days a piece. In the numerical date format displayed in that month, two days have the same format representation early in the month, despite being (clearly) two different "suns" (e.g. days), which causes subsequent days to misrepresent themselves.