8.1.x (tested 8.1.8) timezone bugs

Hello,

When updating for DST we found this nifty problem. This does not happen
on 8.2.

postgres=# SET TIMEZONE TO 'PST8PDT';
SET
postgres=# select now();
now
-------------------------------
2007-03-13 10:41:07.034754-07
(1 row)

postgres=# SET TIMEZONE TO PST8PDT;
SET
postgres=# SELECT NOW();
now
-------------------------------
2007-03-13 09:41:07.036069-08
(1 row)

postgres=# set time zone PST8PDT;
SET
postgres=# select now();
now
-------------------------------
2007-03-13 09:41:07.038045-08
(1 row)

postgres=# SET TIME ZONE 'PST8PDT';
SET
postgres=# select now();
now
-------------------------------
2007-03-13 10:41:07.039145-07
(1 row)

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