Inserting timestamp values

Hi!

Does my test result comply with the statements in section
"8.5 Date/Time Types"? My shell set local time to UTC+8
hours. I was in the impression that the query

insert into test values ('2003-2-1'::timestamp);

equals to

insert into test values ('2003-2-1'::timestamp without time
zone);

but my test results seem to show the other way.

db1=# show time zone;
TimeZone
----------
unknown
(1 row)

db1=# \d test
Table "public.test"
Column | Type | Modifiers
--------+--------------------------+-----------
f1 | timestamp with time zone |

db1=# insert into test values ('2003-1-1'::timestamp);
INSERT 46230 1
db1=# select * from test;
f1
------------------------
2003-01-01 00:00:00+08
(1 row)

db1=# set time zone 9;
SET
db1=# insert into test values ('2003-2-1'::timestamp);
INSERT 46231 1
db1=# select * from test;
f1
------------------------
2003-01-01 01:00:00+09
2003-02-01 00:00:00+09
(2 rows)

db1=# set time zone 0;
SET
db1=# select * from test;
f1
------------------------
2002-12-31 16:00:00+00
2003-01-31 15:00:00+00
(2 rows)

Regards,

CN