Bug in to_timestamp()

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POSTGRESQL BUG REPORT TEMPLATE
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Your name : Neil Bloomer
Your email address : neilbloomer(at)coneyislandsystems(dot)com

System Configuration
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Architecture (example: Intel Pentium) : Pentium II 266

Operating System (example: Linux 2.0.26 ELF) : Red Hat Linux 6.1

PostgreSQL version (example: PostgreSQL-7.0): PostgreSQL 7.0.2 on
i686-pc-linux-gnu, (Red Hat RPM)

Compiler used (example: gcc 2.8.0) : compiled by gcc
egcs-2.91.66

Please enter a FULL description of your problem:
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The to_timestamp function is not working as per the documentation. See the
examples below.

Please describe a way to repeat the problem. Please try to provide a
concise reproducible example, if at all possible:
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The following results were returned when the queries were executed through
ipgsql, and similar results are returned through psql.

select to_timestamp('20000816000001', 'YYYYMMDDHH24MISS') returns
'30/12/1899' (wrong)
select to_timestamp('2000 0816000001', 'YYYY MMDDHH24MISS') returns
'16/08/2000 00:00:01' (ok)
select to_timestamp('000816000001', 'YYMMDDHH24MISS') returns '16/08/0001'
(wrong)

If you know how this problem might be fixed, list the solution below:
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?