Specified date type but created column is timestamp without time zone

Hi

I created a table containing a column of type "date" but the
describe command reports that the created column is "timestamp without time
zone". Why isn't it simply "date"?

psql (EnterpriseDB) 13.4.8

mifis=> create table test (test_date date);
CREATE TABLE
mifis=> describe test;
Table "public.test"
Column | Type | Collation | Nullable | Default
-----------+-----------------------------+-----------+----------+---------
test_date | *timestamp without time zone* | | |

According to https://www.postgresql.org/docs/9.1/datatype-datetime.html
date is a distinct type occupying four bytes whereas timestamp without time
zone occupies 8 bytes.

Thanks

Mike