Stop Press: Oracle Granted License To Extend February ....oracle

Yes, it's official. Oracle has been granted permission to extend February by 3 days. Shame no-one told the developers responsible for INTERVAL arithmetic.

SQL> SELECT DATE '2006-01-31' + INTERVAL '1' MONTH
 2  FROM   dual;
SELECT DATE '2006-01-31' + INTERVAL '1' MONTH
                          *
ERROR at line 1:
ORA-01839: date not valid for month specified