Time zone string not showing

Hi all,

I want to have the time zone string (like 'BRT') displayed after a
date-time. The date column is of the type timestamp with time zone. But
the time zone is not displayed.

It works for a timestamp without time zone column:
# select to_char(timestamp '2001-02-16 20:38:40' at time zone 'BRT',
'HH24:MI DD/MM/YYYY TZ');
to_char
----------------------
23:38 16/02/2001 UTC

It does not work for a timestamp with time zone column:
# select to_char(timestamp with time zone '2001-02-16 20:38:40-05' at
time zone 'BRT', 'HH24:MI DD/MM/YYYY TZ');
to_char
-------------------
22:38 16/02/2001

Is it the expected behavior? Should I just append the time zone
string? The problem is it could be 'BRT' or 'BRST' depending on the
date.

Regards,
Clodoaldo Pinto

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