Time bug with small years

I have no idea what is going on with the minutes/seconds, particularly for
years under 1895 where it gets appended onto the timezone component?

sk_test=# select version();

version
----------------------------------------------------------------------------------------------------------------
PostgreSQL 9.1.1 on x86_64-pc-linux-gnu, compiled by gcc-4.6.real
(Ubuntu/Linaro 4.6.1-9ubuntu3) 4.6.1, 64-bit
(1 row)
-- uname -a output: Linux rbt-dell 3.0.0-13-generic #22-Ubuntu SMP Wed Nov
2 13:27:26 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux

sk_test=# select '1894-01-01'::timestamp with time zone;
timestamptz
------------------------------
1894-01-01 00:00:00-05:17:32
(1 row)

sk_test=# select '1895-01-01'::timestamp with time zone;
timestamptz
------------------------
1895-01-01 00:17:32-05
(1 row)

sk_test=# select '1896-01-01'::timestamp with time zone;
timestamptz
------------------------
1896-01-01 00:00:00-05
(1 row)

sk_test=# show timezone;
TimeZone
-----------
localtime
(1 row)

sk_test=# set timezone= 'est5edt';
SET
sk_test=# select '1895-01-01'::timestamp with time zone;
timestamptz
------------------------
1895-01-01 00:00:00-05
(1 row)

sk_test=# select '1894-01-01'::timestamp with time zone;
timestamptz
------------------------
1894-01-01 00:00:00-05
(1 row)

I can duplicate with the exact same version of Pg on Intel hardware with
kernel:

Linux infongd2888
2.6.28.8-20101130b-iscsi-ntacker-fasync-mremap-amd-sec6-grsec #1 SMP Tue
Nov 30 18:27:29 CET 2010 i686 GNU/Linux