Oracle DST

In my Java Store Procedure, I have a variable, static private TimeZone DTZ=TimeZone.getDefault();
I use DTZ to compare with other time zones.
If I return DTZ through the Java Store Procedure, when I call the Java Store Procedure from a DB function, it shows
sun.util.calendar.ZoneInfo [
id="GMT-04:00",offset=-14400000,dstSavings=0,useDaylight=false,transitions=0,lastRule=null
However, if I run the same Java program on my Linux box, I got
+sun.util.calendar.ZoneInfo[id="America/New_York",offset=-18000000,dstSavings=3600000,useDaylight=true,transitions=235,+
+lastRule=java.util.SimpleTimeZone[id=America/New_York,offset=-18000000,dstSavings=3600000,useDaylight=true,+
startYear=0,startMode=3,startMonth=3,startDay=1,startDayOfWeek=1,startTime=7200000,startTimeMode=0,endMode=2,
endMonth=9,endDay=-1,endDayOfWeek=1,endTime=7200000,endTimeMode=0]]
Notice that the offset and dstSavings are different.
I have Oracle 10 which has Java version 1.4.2. My Linux box also has Java 1.4.2. Both JREs should be the same.
Is DTZ in Java getting from the Oracle?
I just notice that, in Java, offset and dstSavings is for Daylight Saving Time. Those 2 DTZ variables have different value. I believe the Oracle one does NOT apply the DST...
Now the question is how to check if our Oracle set the DST and if we haven't, how to set them?
Any help would be greatly appreciated.
Thank you.
Hong
Edited by: user10311363 on Sep 22, 2008 9:48 AM
Edited by: user10311363 on Sep 22, 2008 9:48 AM
Edited by: user10311363 on Sep 22, 2008 9:49 AM
Edited by: user10311363 on Sep 22, 2008 11:32 AM
Edited by: user10311363 on Sep 22, 2008 11:55 AM
Edited by: user10311363 on Sep 22, 2008 12:00 PM
Edited by: user10311363 on Sep 22, 2008 12:01 PM

Hong,
I'm not sure about this problem. But, i want to share one concept which might be helpful for you.
This is an alternative approach to solve your problem.
Why don't you create a table containing all the city code, offset and Start_DST_Time and End_DST_Time? And, you have to enter once with appropriate data and based on that you can get your offset value in a year. :)
You can call this as a patch work. ;)
Now, you have to wait for a long to get your relevant solution by our other members.
Regards.
Satyaki De.

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Any easier method applicable the schema?
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Check the metalink doc 301431.1 and validate
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Timur Akhmadeev wrote:
Hi,
I suspect this to be a JDBC issue.Nope, this is your schema design gap. It breaks the main principle of PK: to uniquely identify a row in a table always. Your PK doesn't satisfy it, since it depends on client's settings.Why is setting the JVM to UTC working ? This is the part that confuses me.
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jschell wrote:
That statement is phrased oddly.
A java.util.Date uses a UTC offset with millisecond resolution.
A jdbc driver converts that value into a "correct" value for the target database.And from.
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It might not even have a concept of timezone.Again true, although I've yet to come across one; and since OP is only concerned about the timezone in Java I'm not quite sure how relevant that is.
Relevant in terms of the description in terms of what java does, what the database does and how it gets from java to the database.
I would also expect any JDBC driver that cannot translate to or from a Java date correctly to document the fact in 60-point bold type, since it's a violation of the implied contract of ResultSet.getDate().Except that depends on your definition of "correct".
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The drivers will not warn you of things like that. At least not that I have seen.
Format for Oracle.
[http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:77562635789106]
Format for MS SQL Server
[http://msdn.microsoft.com/en-us/library/aa258277(SQL.80).aspx]

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