Oracle BUG 0 Date

SQL> create table aa(a date);

Table created.

SQL> alter session set nls_date_format='yyyy-mm-dd';

Session altered.

SQL> insert into aa select date'-9999-01-01' from dual;
insert into aa select date'-9999-01-01' from dual
                          *
ERROR at line 1:
ORA-01841: (full) year must be between -4713 and +9999, and not be 0


SQL> insert into aa select date'0000-01-01' from dual;

1 row created.

SQL> select * from aa;

A
----------
0000-01-01

SQL> insert into aa select date'-0001-01-01' from dual;

1 row created.

SQL> select * from aa;

A
----------
0000-01-01
0001-01-01

SQL> insert into aa select date'-0000-01-01' from dual;

1 row created.

SQL> select * from aa;

A
----------
0000-01-01
0001-01-01
0000-01-01

SQL> insert into aa select date'-1000-01-01' from dual;

1 row created.

SQL> select * from aa;

A
----------
0000-01-01
0001-01-01
0000-01-01
1000-01-01

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Platform Information:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
PL/SQL Release 9.2.0.4.0 - Production
CORE    9.2.0.3.0       Production
TNS for Solaris: Version 9.2.0.4.0 - Production
NLSRTL Version 9.2.0.4.0 - Production