Oracle Database : Date conversion issue between timezones

Hi All,
We are trying to convert date from Eurpoer/Amsterdam timezone to Australia/Sydnet timezone and extracting time out of it.
We are facing issue related to incorrect timing after conversion.
Please find below issue details,
Environment
Database: Oracle 10.2.0.4
Machine: Linux RHEL 4
Location: Amsterdam, Netherlands
Issue: After converting date from Eurpoer/Amsterdam timezone to Australia/Sydnet timezone
SELECT TO_CHAR (FROM_TZ (TO_TIMESTAMP ('201110201416', 'YYYYMMDDHH24MI'),
DBTIMEZONE
) AT TIME ZONE 'Australia/Sydney', 'HH24:MI')
FROM DUAL
Output of above SQL is 22:16.
Expected output is 23:16
Database Timezone (DBTIMEZONE) is set to +02:00 (i.e. GMT + 2) (Europe/Amsterdam)
If we convert date to Australia/Tasmania timezone then we get expected output i.e. 23:16.
Question: Expected time for Australia/sydney is 23:16, but why Oracle database provides 22:16 as output.
Please note that, Sydney and Tasmania comes under same timezone. Still we get different output for both the timezone.
Oracle database considers GMT + 10 for Australia/sydney and GMT + 11 for Australia/Tasmania.
If we want to use Australia/sydney then how should we get correct sydney time?
Regards
Shailendra

I made a test and it showed when I omit TO_CHAR, both queries have the same result 11:15 PM. So it's TO_CHAR which is the 'culprit'. Since this is a globalization issue, you may repeat your question in this forum:
Globalization Support
(So one of the moderators moves the thread to this forum).
Werner
By the way my local timezone is Europe/Berlin, there should be no difference to Amsterdam.

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