Re: [rt-users] unrecognized time zone name: "GMT"

[Lee Hughes]

Great question Kevin, turns out the timezone files were not readable  
by postgres. This fix worked:

chmod o+r /usr/local/pgsql/share/timezone/*
Thanks again for your prompt and excellent help.

Lee

That's unusual.  What timezones does your Pg know about?
http://www.postgresql.org/docs/9.0/static/view-pg-timezone-names.html

-kevin