Thanks...I figured it out a slightly different way.
Here's what I did (probably lengthy, but works):
--LotDate--(to convert 4#s to text with"/":
Left([WhseJobInfo]![DDIJobID],2) & "/" & Mid([WhseJobInfo]![DDIJobID],3,2)
--InvDate--to display lot date plus one yr)
DateAdd("d",365,[LotDate])...