We have reason to believe that the date-making tool has been fixed. First of all - it seems Maxis had taken it down for a while. It's now back though, and the file size has changed to 2.74 Mb. I believe that it's now possible to create dates successfully, and no more messing with genders. We haven't tested it ourselves yet though. You can use the comments to tell us if it works for you or not.