mpastore,
here's what i ended up doing and it works fine.
PARAMETERS [S] DateTime, [E] DateTime;
SELECT DPADV.PICKUP, IIf([DATE]=' / / ',CDate('01/01/1980'),CDate([DATE])) AS AdvDate
FROM DPADV
WHERE (((IIf([DATE]=' / / ',CDate('01/01/1980'),CDate([DATE]))) Between [S] And [E]))
ORDER...