Fiscal date DD-MON and year end looking forward

Question

Trying to figure out the best way to look forward to the new year and back to the old year when comparing sysdate to a table column fiscal that is formatted DD-MON. The process works perfectly during the year, since is uses current year when comparing data. But at the end of the year, we do not see anything past 12/31 or before 1/1 in a new year. Any ideas? I was thinking of declaring a couple of values and based on sysdate Sep, Oct, Nov, Dec to add 1 year to Fiscal months Jan, Feb, Mar, Apr so they appear as the next year and vice versa for the first months of a new year, subtract one year from the fiscals to indicate previous year. Has anyone worked on something like this in the past?

Answer 1

Look in to this, i am substituting values for the year, so you will get idea.
The fisccal date you have is month end all the time or it is all the dates?
SQL> ed
Wrote file afiedt.buf
  1  WITH T AS
  2    (SELECT '01-DEC' dt  FROM dual
  3     UNION ALL
  4    SELECT  '05-JUL'   FROM dual
  5     UNION ALL
  6    SELECT  '10-JAN'     FROM dual
  7     UNION ALL
  8    SELECT  '30-MAR'    FROM dual
  9     )
10  --ens of data
11  SELECT TO_DATE(dt||'-'||&y,'DD-MON-YYYY') fisc_date,
12         TO_DATE(dt||'-'||&y,'DD-MON-YYYY')+180 NEW_DATE,
13      ADD_MONTHS(TO_DATE(dt||'-'||&y,'DD-MON-YYYY'),6)
14* FROM T
SQL> /
Enter value for y: 2008
old  11: SELECT TO_DATE(dt||'-'||&y,'DD-MON-YYYY') fisc_date,
new  11: SELECT TO_DATE(dt||'-'||2008,'DD-MON-YYYY') fisc_date,
Enter value for y: 2008
old  12:        TO_DATE(dt||'-'||&y,'DD-MON-YYYY')+180 NEW_DATE,
new  12:        TO_DATE(dt||'-'||2008,'DD-MON-YYYY')+180 NEW_DATE,
Enter value for y: 2008
old  13:     ADD_MONTHS(TO_DATE(dt||'-'||&y,'DD-MON-YYYY'),6)
new  13:     ADD_MONTHS(TO_DATE(dt||'-'||2008,'DD-MON-YYYY'),6)
FISC_DATE NEW_DATE  ADD_MONTH
01-DEC-08 30-MAY-09 01-JUN-09
05-JUL-08 01-JAN-09 05-JAN-09
10-JAN-08 08-JUL-08 10-JUL-08
30-MAR-08 26-SEP-08 30-SEP-08