Re: Uniplex "my God, it chills me just mention the dark lord's name,"
Julian date format != Julian calendar.
Julian date format (in this context) means expressing dates in year and day-of-year format. It is a mangled version of "real" Julian dates, which are a straightforward count of days elapsed since noon -4712 Jan 1. The name is unfortunate; you can have Julian-format dates for the Gregorian calendar, as occurred here.
The Julian _calendar_ is the one where any year divisible by four, including century years, are leap years. Your note about the Gregorian fix is correct.