Consideration of dbtimezone value for date conversion? right or wrong

Hi,
I am working on Day Light Saving issue in my application that uses the US based oracle 10g db and now having dbtimezone value as PDT, as part of DST changes we have written below function.
Pacific Standard Time (PST) = GMT-8
Pacific Daylight Time (PDT) = GMT-7
CREATE OR REPLACE FUNCTION GET_GMT_DATE (v_date DATE)
RETURN DATE AS
ndate DATE := v_date;
TIMEZONE VARCHAR(7) := NULL;
BEGIN
select TRIM(dbtimezone) INTO TIMEZONE from dual;
IF TIMEZONE = '-07:00' THEN
ndate := NEW_TIME(ndate, 'PDT', 'GMT');
ELSE
ndate := NEW_TIME(ndate, 'PST', 'GMT');
END IF;
RETURN ndate;
END get_GMT_date;
The funda behind the logic is Application uses the sysdate to enter the date record in XYZ oracle 10g db As per the requirement we have to convert the same date to GMT and show the same in our application.
Now to convert the date into GMT we have used the above function which is based on dbtimezone value of XYZ oracle 10g database. It also has a oracle DST patch applied.
Our assumption is to check the current time zone, if this is -7 than use the PDT in new_time function to GMT otherwise use pst for conversion.
We have tested the same in dev environment and it’s working fine for today but after November(DST over) it will work or not that’s a issue. Request any body to please confirm the logic of function.
Thanks in advance.
Edited by: 802313 on Oct 15, 2010 7:05 AM

Also Please let me know that Daylight saving Patch from oracle changes the dbtimezone value of oracle 10g db or not after DST and Before DST.

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