We have found in SH4 while doing Fall of the Rising Sun Ultimate, that "fictitious" dates abound in the game. I'm sure those came from SH3, which probably got 'em from SH2...
You will find February 29th (not so often), April 31 (not so often) and June 31 (frequently). I'm sure there's some September 31 and November 31 dates, but I can't remember how many. CapnScurvy has been on a tear over there lately, and might have all of those eliminated from FotRS. Might not be in our next release, but maybe the one after that.
That said, I have no idea if that sort of stuff influences "Available" dates like you're seeing or not. We did have issues with skinning, but found date issues across the vessel's entire file set. In other words, the two cfg files didn't match, the skins didn't match, and something else didn't match... I'd have to ask s7rikeback to refresh my memory... Either that, or change my batteries out...
