Character Creation, Birth date selection values are off

[OniCabbit]

The Gregorian calendar =/= to Eorzean calendar (note that all sun moon phase on the calendar have the same number of days in them unlike Gregorian calendar)
either take the equivalent conversion or set it true in Eorzean calendar to make it 6/12 so it show as 6/12 (would have to recreate character though or see if you can get a character remake not sure if that will let you change the birth date)