Progress DB: Set Where Value based on current date

Question

Edit with more info: Here is the basic Idea:

Select 
    ID,
    Site,
    Pay,
    Code
FROM STAFF
    WHERE CASE
    When 1/1/2013 < CURDATE() < 3/1/2013 then Staff."Code" in (1,2,3)
    When 3/1/2013 < CURDATE() < 5/1/2012 then Staff."Code" in (2,3,4)
    END

I almost never user Progress DB so any help would be greatly appreciated. Thank You,

Answer 1

Do you mean something like this?

WHERE
    (CURDATE() BETWEEN 1/1/2013 AND 3/1/2013 AND Staff."Code" IN (1,2,3)) OR
    (CURDATE() BETWEEN 3/1/2013 AND 5/1/2013 AND Staff."Code" IN (2,3,4))