Help with a set that compare dates

[#1]

Hi

How should I wright a set expression that shows the PersID for the following?

StartDate should be larger then EndDate but not larger then EndDate12

(EndDate12 = EndDate + 12 months. I create this in the script using addmonths)

[#2 · Accepted solution]

I think I got one solution.

Count({$<StartDate={">$(=Date(EndDate))<$(=Date(EndDate12))"}>}PERSID)