Adding days to a date causes it to be set back a year.

Hello,
I have the following problem on Oracle 10g. I run the following statment that adds 1 year to a date but, unless I format it, the date comes back with one year less than it should.
SQL> select effective_date, (effective_date + interval '1' year(1)) as addyear, add_months(to_date(to_char(effective_date, 'MM/DD/YYYY HH24:MI:SS'), 'MM/DD/YYYY HH24:MI:SS'), 12) as addyearformat
   from price_change
        where
        price_change_id = '794328'   ;
EFFECTIVE_DATE ADDYEAR         ADDYEARFORMAT
28-SEP-09       28-SEP-08       28-SEP-10Has anyone else ever seen something like this?
Effective_date is a date type and has data in the format 'MM/DD/YYYY HH24:MI:SS'. I think it is something with the format, maybe something to do with the time zone - not sure. If I just insert a value into the table with the format 'MM/DD/YYYY HH24:MI:SS' I don't have this problem. I don't know how the date could have been changed to cause this but I do know it goes through a time zone function before being inserted into this table though I don't know if that is causing the problem.
Not sure if it matters but nls_database_parameters...
PARAMETER VALUE
NLS_DATE_FORMAT dd-mon-rr
NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR
NLS_TIME_FORMAT HH.MI.SSXFF AM
NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR
Thanks for any help in advance.
Edited by: amcgator on Oct 15, 2010 11:52 AM

Funny, but I think somehow your dates are BC:
with price_change as (
                      select to_date('28-SEP-09 BC','dd-mon-yy bc') effective_date from dual
select effective_date,
        (effective_date + interval '1' year(1)) as addyear,
        add_months(to_date(to_char(effective_date, 'MM/DD/YYYY HH24:MI:SS'), 'MM/DD/YYYY HH24:MI:SS'), 12) as addyearformat
from price_change
EFFECTIVE ADDYEAR   ADDYEARFO
28-SEP-09 28-SEP-08 28-SEP-10
SQL> Issue:
select to_char(effective_date,'mm/dd/yyyy bc')
from price_change
where price_change_id = '794328'
/SY.

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05-OCT-2011 16:33:27 23 07-NOV-2011 16:33:27
05-OCT-2011 16:33:27 24 08-NOV-2011 16:33:27
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