to substract days from date & get get date formate is as below :-
this will returns julian day
select days(current date) from sysibm.sysdummy1
1
-----------
731652
1 record(s) selected.
this is adding 3 days to current (03/12/2004 ) getting 03/15/2004, in stead of current date , put your columns , you will get it
select date(days(current date) +3 ) from sysibm.sysdummy1
1
----------
03/15/2004
1 record(s) selected.
--Lekharaju Ennam