What's your definition of Julian Date?
If it's yyyyddd (where Jan 1 is 1, Jan 31 is 31, Feb 1 is 32 and so on until
Dec 31 is either 365 or 366, depending on whether it's a leap year or not),
then try:
DateSerial(Left([JulianDate], 4), 1, Right([JulianDate], 3))
(the reason I'm asking is because that's what most people call Julian Date,
but it's not. See
http://en.wikipedia.org/wiki/Julian_date for what Julian
date really is!)