Daylight Saving Time Question

Dear all,
Is there a way to check if my database is using the timestamp with timezone.
I mean any query.
waiting for your reply.
Thnaks in advance.
MSD

See Metalink Note:412971.1 for the script you need

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Question:
When you apply the 10.2.0.4 patch (linux-64 bit), does this patch include the daylight saving time patch that needed to be applied in earlier releases?

I know that. I was looking for the readme file but my metalink account did not have access to it. I was hoping that the forum would fill in the gap for me.
In this situation, I should have installed the 10.2.0.1 database, then the DST patch and then the 10.2.0.4. Instead, I got ahead of myself and did the 10.2.0.4 patch first. I was just wondering if the DST patch was included in the 10.2.0.4 by now. The good news is that I had my metalink updatred so I have access to the readme file now. I'm glad you knew the answer. Oh wait, you don't.

Exchange Active Sync UTC Daylight Saving Time

Color me a bit confused. I am attempting to write an IOS client application to communicate with Exchange ActiveSync and display calendar information. But I am seeing some conflicting information in the protocol docs when compared to what I am getting from
Exchange. Either that or I am somehow misinterpreting one or the other.
My intent is to save an appointment in my local database in Coordinated Universal Time and then have the UI read in the information and display it as appropriate to the local timezone. In this way an recurring appointment created before daylight saving time
for Noon will still be at the same time of day in local time as an appointment created during daylight saving time for noon. But they are not.
My understanding of the documentation is as such:
In MS-ASCAL pdf section 2.2.2.40 (roughly page 34) it says for Start Time that : ...the value of this element is a dateTime data type as specified in MS-ASDTYPE section 2.3.
Moving to MS-ASDTYPE section 2.3 (roughly page 7) the dateTime value is specified in the format of ISO-8601 and all dates are given in Coordinated Universal Time (UTC)
Looking up coordinated universal time I see that UTC does not changed with the seasons as local or civil time does and therefore DOES NOT support daylight saving time. This makes sense, as DST is decidedly local and is ignored by many areas. You cannot know
from the perspective of UTC whether or not to apply a DST offset without knowing what timezone and area the time represents, therefore no daylight saving time can be supported. Based on this information I should be able to just slap the dates into my database
as they are and merely have the UI adjust itself to display them properly.
However, as a tested I began seeing a divergence of an hour between the two appointments in the database before the UI has even read them. To confirm this I created two recurring appointments representing Lunch at 12 noon local time. One that starts on March
1st 2014 (Standard Time) and one that starts on March 10th 2014 (daylight saving time) in the eastern timezone. This should be March X 2014 at 1700 hours in both cases should it not?
In the WBXML/XML that I am receiving I am getting two different times. The appointment that starts during standard time gives me a start time of 20140301T170000Z. The appointment that starts after daylight saving time is in effect locally gives me 20140301T160000Z.
The difference between the two times is 1 hour, which is the daylight saving time offset. It is my perception based on everything that I have read both in the microsoft protocol documentation and outside it that these two times should be the same and that whatever
client that gets to display them should be the one putting the offset in place as needed. Noon local time is noon local time but local time is the province of the local municipality/timezone, not that of UTC.
So my question is what exactly is going on here? Are the start/stop/date stamp date times in UTC or not. If they are in UTC, then why are they offset by an hour instead of being at the same time? Obviously outlook displays these correctly for local time,
because both appear at noon. But in my case my database contains locally adjusted times instead of the UTC times I thought I was getting which is throwing off when those appointments appear in the UI.
Can someone please clarify what's going on here and what I should be seeing?
Thanks.
E

Thanks for the reply, however after doing what is said the problem still remains. I did not try the manual approach, because of the time that would take with calendars that change at least daily.
I am running the latest update of ICal and IPod, you would think this would have been addressed with one of the updates to allow the sync to work correctly with 5th generation IPods.
I am going to try and turn off day light savings time set the clock to a Central Time zone and see if that works, I do not cross time zones much, anymore.
MacBook Mac OS X (10.4.9)

TimerThreads and daylight saving time

I have this task that I need to do everyday at 0:00 AM.
I am using the ScheduleAtFixedRate method to perform this starting it at 0:00 AM and running it again every 24 hours. It is very important to run at 0:00 because it involves money a a reconciliation file.
According to the API documentation:
Fixed-rate execution is appropriate for recurring activities that are sensitive to absolute time, such as ringing a chime every hour on the hour, or running scheduled maintenance every day at a particular time.
My question is what about daylight-saving time ? What happens to such a task that is supposed to run every day at 0:00 ?
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My guess, and it is just a guess, is that the task will run every 24 hours, and therefore after a daylight saving time switch you will find it running at 01:00 or at 23:00. But I would suggest you test for yourself. Set up a test program that schedules a task every 3 hours, change your system's date and time to be 5 hours before the end (or start) of DST, and see what happens after it runs for 6 hours.

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Does ISE support DST change?

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We have a problem with conversion of Calendars to timestamp with timezone for the last hour of Daylight Saving Time (e.g. 01:00 EDT - 01:59 EDT) where it is being interpreted as Standard Time which is in reality 60 minutes later.
We've written a JUnit test case that runs directly against TopLink to avoid any issues with WAS and its connection pooling.
The Calendar theDateTime comes from an object called TimeEntry which is mapped to a TIMESTAMP WITH TIMEZONE field using conversion mapping with Data Type TIMESTAMPTZ (oracle.sql) and Attribute Type Calendar (java.util).
We are using:
Oracle TopLink - 10g Release 3 (10.1.3.0.0) (Build Patch for Bugs 5145690 and 5156075)
Oracle9i Enterprise Edition Release 9.2.0.7.0 - 64bit Production
Oracle JDBC driver Version: 10.2.0.1.0
platform=>Oracle9Platform
Execute this Java:
SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy HH:mm z");
TimeZone tzEasternRegion = TimeZone.getTimeZone("US/Eastern");
Calendar theDateTime = Calendar.getInstance(tzEasternRegion);
theDateTime.setTime(format.parse("10/29/2006 01:00 EDT"));
Persist to the database and execute this SQL:
SELECT the_date_time, EXTRACT(TIMEZONE_REGION FROM the_date_time), EXTRACT(TIMEZONE_ABBR FROM the_date_time), EXTRACT(TIMEZONE_HOUR FROM the_date_time)
FROM time_table WHERE time_table_id=1
This provides the following results:
THE_DATE_TIME EXTRACT(TIMEZONE_REGION FROM the_date_time) EXTRACT(TIMEZONE_ABBR FROM the_date_time) EXTRACT(TIMEZONE_HOUR FROM the_date_time)
29-OCT-06 01.00.00.000000 AM US/EASTERN US/Eastern EST -5
The wrong time zone is in the database. It should be EDT -4. Let's test the SQL that should be generated by TopLink. It should look like the following.
Execute this SQL:
UPDATE time_table SET the_date_time = TO_TIMESTAMP_TZ('10/29/2006 01:00 US/Eastern','mm/dd/yyyy HH24:MI TZR') WHERE (time_table_id=1)
SELECT the_date_time, EXTRACT(TIMEZONE_REGION FROM the_date_time), EXTRACT(TIMEZONE_ABBR FROM the_date_time), EXTRACT(TIMEZONE_HOUR FROM the_date_time)
FROM time_table WHERE time_table_id=1
This provides the same results:
THE_DATE_TIME EXTRACT(TIMEZONE_REGION FROM the_date_time) EXTRACT(TIMEZONE_ABBR FROM the_date_time) EXTRACT(TIMEZONE_HOUR FROM the_date_time)
29-OCT-06 01.00.00.000000 AM US/EASTERN US/Eastern EST -5
Now, execute this SQL:
UPDATE time_table SET the_date_time = TO_TIMESTAMP_TZ('10/29/2006 01:00 EDT US/Eastern','mm/dd/yyyy HH24:MI TZD TZR') WHERE (time_table_id=1)
SELECT the_date_time, EXTRACT(TIMEZONE_REGION FROM the_date_time), EXTRACT(TIMEZONE_ABBR FROM the_date_time), EXTRACT(TIMEZONE_HOUR FROM the_date_time)
FROM time_table WHERE time_table_id=1
This provides better results:
THE_DATE_TIME EXTRACT(TIMEZONE_REGION FROM the_date_time) EXTRACT(TIMEZONE_ABBR FROM the_date_time) EXTRACT(TIMEZONE_HOUR FROM the_date_time)
29-OCT-06 01.00.00.000000 AM US/EASTERN US/Eastern EDT -4
The correct time zone is now in the database. Let's test reading this with the following Java:
System.out.println("cal= " + theDateTime);
System.out.println("date= " + theDateTime.getTime());
System.out.println("millis= " + theDateTime.getTimeInMillis());
System.out.println("zone= " + theDateTime.getTimeZone());
This provides the following results:
cal= java.util.GregorianCalendar[...]
date= Sun Oct 29 01:00:00 EST 2006
millis= 1162101600000
zone= sun.util.calendar.ZoneInfo[id="US/Eastern",...]
The TimeZone object is correct since we are using the US/Eastern regional time zone, but the millis are wrong which makes the time EST instead of EDT. The millis should be 1162098000000.
The conversion from java.util.Calendar to TIMESTAMPTZ loses the actual offset when setting to a regional time zone. It can maintain this info by specifying it explicitly.
The conversion from TIMSTAMPTZ to java.util.Calendar also loses the actual offset even if the correct offset is in the database.
Has anyone else encountered this conversion problem? It appears to be a conversion problem in both directions. I know that the Calendar is lenient by default and will assume Standard Time if time is entered during the repeated 1 o'clock hour at the end of Daylight Saving Time, but the Calendars we are using are explicit in their time, so this would be classified as data corruption.
Nik

Opened an SR. Looks like there is a problem with conversion either in TopLink or in JDBC.

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I have several international web sites on this server, one of
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problem only occurs during 1 hour out of 8,760 hours, but when you
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Hi,
We have a customer that has several sites around the world.
In a VC-model I like to use the Clock UI control to display the times of the different sites.
This can be done by setting the time zone in the control properties.
A long ago we have introduced daylight saving time.
It seems that the clock control does not do anything with this ?
How can I change the time zone when the model is running ?
Can it be done by an expression and how ?
There is also a problem of the country, some have DST, others dont.
See http://en.wikipedia.org/wiki/Daylight_saving_time_around_the_world
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I have 2 clocks and the end-user lives in Amsterdam:
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During the winter in Amsterdam it is summer in Santiago and has daylight saving so the time in Santiago should be GMT 3 in stead of GMT -4.

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Daylight Saving Time Question

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