Converting UTC dates to local time

Hello all. I have some data I imported that has a date column containing dates spanning a number of years. The dates are in the UTC timezone.
I need to display the dates in the local time zone that was in effect at the time. I've seen many fine examples of converting from one time zone to another. But I need it to be smarter than that. For example, date/times (this year) prior to 03/09/2008 2AM should display in EST (my zone in effect then), while date/times on/after then should display in EDT.
Are there any Oracle built-in functions to do this, or will I need to gather the data of when daylight savings time begins/ends for the years I have dates and write my own function? I don't need help for the latter; I just don't want to reinvent the wheel. Also, I don't want to convert the data; I append to it regularly.
Thanks for your help and consideration.

Sergiusz, thanks again. When I added a very recent date, I saw the effect. But perhaps something is wrong with my local 10gR1 "play" database. It seems the DST start point is not correct. Should it not start showing -4 offset at row# 4? I didn't see a change until I added the last date. But I believe DST began on 3/9/2008 at 2am local, which is 7am UTC.
~Pete
SQL> DROP   TABLE imported_events;
Table dropped.
SQL> CREATE TABLE imported_events (event_date TIMESTAMP(0) WITH TIME ZONE);
Table created.
SQL> BEGIN
2 INSERT INTO imported_events VALUES ( '10-JAN-08 2:00:00 PM UTC');
3 INSERT INTO imported_events VALUES ( '08-MAR-08 2:00:00 PM UTC');
4 INSERT INTO imported_events VALUES ( '09-MAR-08 6:59:00 AM UTC');
5 INSERT INTO imported_events VALUES ( '09-MAR-08 7:01:00 AM UTC');
6 INSERT INTO imported_events VALUES ( '09-MAR-08 2:00:00 PM UTC');
7 INSERT INTO imported_events VALUES ( '10-MAR-08 2:00:00 PM UTC');
8 INSERT INTO imported_events VALUES ( '09-JUN-08 2:00:00 PM UTC');
9 COMMIT;
10 END;
11 /
PL/SQL procedure successfully completed.
SQL> COLUMN ROWNUM         FORMAT 99
SQL> COLUMN event_date_utc FORMAT A25
SQL> COLUMN offset_local   FORMAT 99
SQL> COLUMN offset_eastern FORMAT 99
SQL> SELECT ROWNUM
2        ,event_date event_date_utc
3        ,TO_CHAR(CAST((event_date AT LOCAL) AS DATE),'YYYY-MM-DD HH24:MI:SS') date_local
4        ,(CAST((event_date AT LOCAL) AS DATE) - CAST(event_date AS DATE))*24 offset_local
5        ,TO_CHAR(CAST((event_date AT TIME ZONE 'US/Eastern') AS DATE),'YYYY-MM-DD HH24:MI:SS') date_eastern
6        ,(CAST((event_date AT TIME ZONE 'US/Eastern') AS DATE) - CAST(event_date AS DATE))*24 offset_eastern
7    FROM imported_events
8   ORDER BY 1;
ROWNUM EVENT_DATE_UTC            DATE_LOCAL          OFFSET_LOCAL DATE_EASTERN        OFFSET_EASTERN
     1 10-JAN-08 02.00.00 PM UTC 2008-01-10 10:00:00           -4 2008-01-10 09:00:00             -5
     2 08-MAR-08 02.00.00 PM UTC 2008-03-08 10:00:00           -4 2008-03-08 09:00:00             -5
     3 09-MAR-08 06.59.00 AM UTC 2008-03-09 02:59:00           -4 2008-03-09 01:59:00             -5
     4 09-MAR-08 07.01.00 AM UTC 2008-03-09 03:01:00           -4 2008-03-09 02:01:00             -5
     5 09-MAR-08 02.00.00 PM UTC 2008-03-09 10:00:00           -4 2008-03-09 09:00:00             -5
     6 10-MAR-08 02.00.00 PM UTC 2008-03-10 10:00:00           -4 2008-03-10 09:00:00             -5
     7 09-JUN-08 02.00.00 PM UTC 2008-06-09 10:00:00           -4 2008-06-09 10:00:00             -4
7 rows selected.
SQL>

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Date in UTC: Sa, 24.12.2005, 17:00As expected!
Now, we enter the dark zone of DST: Each year DST is turned on and off and it seems as if this leads to problems in both cases. Let's start with the next event of this case: At Oct., 30th, 2005, DST is turned off between 2:00 and 3:00 at night. So, we have once 2:30 with DST and (one hour later) 2:30 again without DST. Java, however, garbles things completely (I'm leaving the unneeded lines of my debug output out now):
Entered date: So, 30.10.2005, 01:59
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Date in UTC: Sa, 29.10.2005, 23:59
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Date in UTC: So, 30.10.2005, 02:00
Entered date: So, 30.10.2005, 02:30
zone_offset: 3600000, dst_offset: 0, offset: 3600000
Date in UTC: So, 30.10.2005, 02:30
Entered date: So, 30.10.2005, 02:59
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zone_offset: 3600000, dst_offset: 3600000, offset: 7200000
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Entered date: So, 27.3.2005, 03:00
zone_offset: 3600000, dst_offset: 3600000, offset: 7200000
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Can anyone help me? What am I doing wrong? How do I actually convert correctly between a DST-aware local time zone and GMT/UTC?
Best regards,
Dirk

Well, I would not say I did "just about everything" wrong. Actually, Calendar is not GMT-only as it has time zone information and converts its internal time according to that information if I use the getTime() function (what I do).
In my applications, I handle dates in my own data structures. My EDate object (which is part of the QJCC library hosted on SourceForge) stores years, months, days, minutes, hours, and seconds seperately. Using this class, I managed to get an actually working time zone conversion this way:
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