to_date/to timestamp going to BC

Can someone tell me if this is a bug with the date functions or am I using
them incorrectly?
If anyone has a workaround for this I could use some help this data
conversion.

dev=> create table test_date (dt varchar(100));
CREATE

dev=> insert into test_date values ('March 11, 1997');
INSERT 706020 1

dev=> select dt, to_date(dt, 'Month dd, yyyy'), to_timestamp(dt, 'Month dd,
yyyy') from test_date;
dt | to_date | to_timestamp
----------------+---------------+---------------
March 11, 1997 | 0001-03-19 BC | 0001-03-19 BC

drw_dev=> select version();
version
----------------------------------------------------------------
PostgreSQL 7.1 on sparc-sun-solaris2.6, compiled by GCC 2.95.2
(1 row)