BUG #3511: timeofday()::timestamp failing on Saturday when using australian_timezones = on

The following bug has been logged online:

Bug reference: 3511
Logged by: Adam
Email address: adam(at)subdesigns(dot)net
PostgreSQL version: 8.1.9
Operating system: Debian etch, using postgresql-8.1:8.1.9-0etch1
Description: timeofday()::timestamp failing on Saturday when using
australian_timezones = on
Details:

Conversion to a timestamp is failing to decode a timeofday() date string
which has both 'Sat' and a timezone 'EST', when australian_timezones is
enabled.

date config is set as:
datestyle = 'iso, dmy'
australian_timezones = on

Following code details the conversion issue. Removal of the 'EST' timezone,
or changing to a different (even invalid) day does not result in an error.

erams=# select timeofday();
timeofday
-------------------------------------
Sat Aug 04 12:17:29.290100 2007 EST
(1 row)

erams=# select timeofday()::timestamp;
ERROR: invalid input syntax for type timestamp: "Sat Aug 04 12:17:29.290100
2007 EST"
erams=# select 'Sat Aug 04 12:17:29.290100 2007 EST'::timestamp;
ERROR: invalid input syntax for type timestamp: "Sat Aug 04 12:17:29.290100
2007 EST"
erams=# select 'Sun Aug 05 12:17:29.290100 2007 EST'::timestamp;
timestamp
--------------------------
2007-08-05 12:17:29.2901
(1 row)

erams=# select 'Sat Aug 11 12:17:29.290100 2007 EST'::timestamp;
ERROR: invalid input syntax for type timestamp: "Sat Aug 11 12:17:29.290100
2007 EST"
erams=# select 'Sun Aug 11 12:17:29.290100 2007 EST'::timestamp;
timestamp
--------------------------
2007-08-11 12:17:29.2901
(1 row)

erams=# select 'Sat Aug 10 12:17:29.290100 2007 EST'::timestamp;
ERROR: invalid input syntax for type timestamp: "Sat Aug 10 12:17:29.290100
2007 EST"
erams=# select 'Sat Aug 09 12:17:29.290100 2007 EST'::timestamp;
ERROR: invalid input syntax for type timestamp: "Sat Aug 09 12:17:29.290100
2007 EST"
erams=# select 'Sat Aug 04 12:17:29.290100 2007'::timestamp;
timestamp
--------------------------
2007-08-04 12:17:29.2901
(1 row)

erams=# select 'Mon Aug 04 12:17:29.290100 2007 EST'::timestamp;
timestamp
--------------------------
2007-08-04 12:17:29.2901
(1 row)

Conversion to timestamptz also results in same issue:

erams=# select timeofday()::timestamptz;
ERROR: invalid input syntax for type timestamp with time zone: "Sat Aug 04
12:52:47.381035 2007 EST"

Removal of the 'Sat' corrects the issue:
erams=# select substring(timeofday() from '^[^[:space:]]* (.*
[[:digit:]]{4})')::timestamp;
substring
----------------------------
2007-08-04 13:33:20.825623
(1 row)

erams=# select substring(timeofday() from '^[^[:space:]]* (.*
[[:digit:]]{4})')::timestamp::timestamptz
erams-# ;
substring
-------------------------------
2007-08-04 13:33:26.137588+10
(1 row)

Changing australian_timezones = off corrects the issue.