Casting and Timestamp - Mailing list pgsql-general

I have unexpected results when trying to cast a string to a timestamp:

test=# select  TIMESTAMP WITH TIME ZONE '2006/06/25 06:00:00 GMT-5'
test-# ;
       timestamptz
------------------------
  2006-06-24 20:00:00-05


Seems that what I get is about 10 hours earlier than I expect...

Any ideas why this is happening?  Did I assume too much in the cast?

Thanks,
Mark