I just want to take the current month of the document date and make it "1" and do the same for future months (i.e. 2 = next month, etc.) and say that those numbers are between 1 and 18.
Once again, I'm not getting it:
where DATEADD((DATEPART(m, getdate())))- DATEADD(DATEPART(m, POContractHeader.DOCDATE)) BETWEEN 1 and 18