Daylight saving time off by 1 hour
Greetings.
There is a java aplication running on my windows XP professional client. It apparently uses one of the java functions to get the date from my client PC. The problem is that the time in the application is off by one hour.
I am in the eastern time zone with daylight savings time checked.
If I uncheck daylight savings time the application time is correct.
I am using the latest JRE which seems to include multiple version's of the java webstart which I can see in the registry.
Anybody come across this.
Over and out,
just use
java.util.Date now = new java.util.Date();
java.util.TimeZone tz = java.util.TimeZone.getTimeZone("Europe/Berlin"); // adjust for your time zone
now.setTime(now.getTime() + tz.getDSTSavings());
and
new java.text.SimpleDateFormat("HH:mm:ss", java.util.Locale.GERMAN).format(now)
to obtain the formatted time as String.
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Daylight Saving Time off by one hour
Take a close look at the attached screenshots. Both cRIO and PC are synchronized to the same time server. Yet, there is 1 hour & 1 minute difference on PST8PDT, or "only" 1 minute difference on PST8.
Is it a bug???
I notice the same thing in LabVIEW when converting the current time in secondes with the DBL converter.
Attachments:
PST8PDT.png 62 KB
PST8.png 61 KBGood Afternoon,
What time server are you synchronizing the computer and cRIO to? Here is a useful KnowledgeBase article to follow to make sure you have it setup correctly. I hope you have a great rest of the day!
Configuring CompactRIO Real-Time Controllers to Synchronize to SNTP Servers
http://digital.ni.com/public.nsf/allkb/F2B057C72B537EA2862572D100646D43?OpenDocument
Kind Regards,
Cody Covington
Applications Engineer
National Instruments
ni.com/support -
Recurring events off by 60 minutes after daylight saving time switch
I searched but didn't find this exact issue anywhere. Following this past weekend's switch to Daylight Saving Time (DST), iCal recurring events have been shifted one hour later. It is a problem that I encountered with my own web calendaring application, wherein the offset between UTC and a given time zone changes with the coming and going of DST. I am curious why Apple has never instituted a fix for this, especially considering that the fix is so simple. All that must be done is detect whether the original datetime is in DST or not. If it is not, and the given recurrence is, then you must subtract 60 minutes from the recurrence's datetime. Similarly, if the originating datetime is in DST, and the given recurrence is not, then you must add 60 minutes to the recurrence's datetime.
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What is the best way to switch off Daylight Saving Time?
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Cause
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Resolution
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Hello,
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DawnOkay, I ran the update... Two problems here.
1. Now my calendar events between March 11 and March 31st 2007 are off by an hour (although they show the correct time when you open the event to view it).
It doesn't work to delete the event and create a new one... It still shows as the wrong time. the only way I found to fix the time problem is to set each event for the incorrect time zone (I'm in Pacific and have to set it to Arizona).
2. Each "all day event" I scheduled into my calendar show up the day before the actual event date, yet when I open the event they show the correct date. Example - If I scheduled an all day event for April 19th, it appears on my calendar on April 18th. Yet, when I open the event to view the details, it does say "April 19".
The only way I've found to fix the birthday events to the correct day is to delete each one and re-schedule.
I find this highly inconvenient and and huge time waster. My business depends on my calendar being accurrate and I don't have time to adjust hundreds of entries.
If other folks are having this issue, speak up. It would be great if other folks knew they should wait to install this until a fix is issued.
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My understanding of the documentation is as such:
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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.
EThanks 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) -
Conversion mapping is losing time zone data during daylight saving time
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.
NikOpened an SR. Looks like there is a problem with conversion either in TopLink or in JDBC.
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Brazil Daylight Saving Time Problem
In Brazil, we enter the summer time and my blackberry 9800 torch automatically work, but when I synchronized with the playbook, some problems arose.
The time in the menu setting is correct, as you can see in this image:
But the wrong time remains the main screen:
Does anyone have the same problem and knows how to fix it?
tks,It did not work.
It is indifferent to select manual or automatic, the problem persists.
I'm in Brazil and with the correct time zone, but we are on daylight saving time.
On the menu setting time and date, the time is right, however, in early 1 hour on application clock and and late 1 hour on the main screen. -
CreateODBCDateTime monkeys with Daylight Saving Time!!
If one uses CreateODBCDateTime to convert a date into the
proper format for storing in a SQL Server database, and one runs
this operation on a date between 0200 and 0300 on the day that
Daylight Saving Time changes, the function will change the time
forward or backward one hour. IT WILL DO THIS EVEN IF THE DATE YOU
ARE STORING IS UTC, thus rendering UTC times INVALID because they
do not have DST. Why does this function monkey with DST at all?I have several international web sites on this server, one of
which has over 100,000 users who have contributed over 70 million
records, all with UTC timestamps. The problem occurs during the one
hour period EVERY YEAR when daylight saving time is started. It
does not do this in the fall when the time reverts. So, yes, the
problem only occurs during 1 hour out of 8,760 hours, but when you
start with 70 million records over 5 or 6 years...
But the danger is for anybody who stores or manipulates a
date/time OTHER THAN the date/time that is being used internally to
the server. In other words, if your server is set to Central Time,
and you have users in Hawaii or Arizona who need to store their own
date/time, it is likely to apply Central Timezone RULES to that
date/time, even if Hawaii and Arizona don't use DST.
Let's say you're scheduling operating rooms in a hospital in
Honolulu. All the CF routines are going to make sure to shift those
times forward an hour without warning, have a nice day. In my case,
it is happening with UTC, but it could be ANY time zone that has
different rules than the ones on your server.
Yes, I can probably figure out a different way to process
times, but this is a massive system with thousands of different
templates. In fact it affects several pretty massive software
systems with millions of lines of code, so it's not as if I can
just change a few SQL queries and be done with it.
It probably should be a rule for anybody operating a
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times from different regions might need to be stored in a database,
to set up the server on UTC time just to avoid this problem.
Me, I have to
a. find all the places this will affect in thousands of lines
of code,
b. try to decide what impact going to UTC on the server will
have on things like scheduled tasks, email servers, etc,
c. then figure out whether there is any way to repair tens of
thousands of corrupted records -
Switch from daylight saving time to winter time
Hello,
Can somebody describe why it is recommended (note 7417) to shut down the system for a little over two hours? Why is is not enough to deactivate the system 5 minutes before last daylight saving time hour has started and activate it when the winter time is started? Why should we wait until the first hour of winter time has ended?
Note 7417 gives the following example:
'If the hour from 2:00 to 3:00 occurs twice when you change to standard time, you must deactivate the system from 01:55:00 AM until 3:05 AM"
It is not clear, why the system cannot be activated at 2:05 AM after the time is switched...
Thanks in advance,
YelenaHi Yelena,
Check the note 102088, it's clearly mentioned about 'double hour' and why it need's to be shout down?.
Regards,
Hari.
PS: Award points if helpful. -
SCEP scheduled scan time problem with daylight-saving time?
Since the daylight-saving time change from last weekend (1 hour earlier) we see that a large group of SCEP clients start their scheduled scan at 11:00 where we have it set in the policy in SCCM2012 at 12:00.
Most workstations still begin their scan at 12:00.
Any idea?
Regards, BobI’m cleaning up old post, did you figure this out yet, if so what was the solution?
Garth Jones | My blogs: Enhansoft and
Old Blog site | Twitter:
@GarthMJ -
Hi all,
I know this subject has been posted before, but i haven't found any suitable response. I need to disable daylight saving time, but i haven't been lucky yet. I've tried several things:
// Option A
Calendar calendar= new GregorianCalendar(TimeZone.getTimeZone("GMT+01:00"));
// Option B
Calendar calendar= new GregorianCalendar(TimeZone.getTimeZone(Some String Suitable));
// Option C
Calendar calendar= new GregorianCalendar(new SimpleTimeZone(int, Some String Suitable));
// Option D
SimpleTimeZone stz;
stz.setDSTSavings(0); // I get an errorAnd many other solutions, but it keeps applying daylight saving time and changing from 25/03/2007 01:00 to 25/03/2007 03:00. Any workarounds that doesn't involve to build my own Calendar? Also i can't disable it in the Operating System because it would affect other applications.
Thanks in advance.Hi man, i've tried that also and still the same problem, code:
// Japan hasn't DST
Calendar calendar= new GregorianCalendar(TimeZone.getTimeZone("GMT+9"), Locale.JAPAN);
calendar.set(Calendar.MONTH, Calendar.MARCH);
calendar.set(Calendar.DAY_OF_MONTH, 24);
for (int i= 0; i< 50; i++) {
System.out.println(calendar.getTime());
calendar.add(Calendar.HOUR, 1);
}Also i've tried with identical result:
Calendar calendar= new GregorianCalendar(TimeZone.getTimeZone("Asia/Tokyo"), Locale.JAPAN);
calendar.set(Calendar.MONTH, Calendar.MARCH);
calendar.set(Calendar.DAY_OF_MONTH, 24);
for (int i= 0; i< 50; i++) {
System.out.println(calendar.getTime());
calendar.add(Calendar.HOUR, 1);
}And finally i've tried the "set" method (in several lines) and still the same result:
Calendar calendar= new GregorianCalendar(TimeZone.getTimeZone("Asia/Tokyo"), Locale.JAPAN);
calendar.setTimeZone(TimeZone.getTimeZone("Asia/Tokyo"));
calendar.set(Calendar.MONTH, Calendar.MARCH);
calendar.set(Calendar.DAY_OF_MONTH, 24);
calendar.setTimeZone(TimeZone.getTimeZone("Asia/Tokyo"));
for (int i= 0; i< 50; i++) {
System.out.println(calendar.getTime());
calendar.add(Calendar.HOUR, 1);
calendar.setTimeZone(TimeZone.getTimeZone("Asia/Tokyo"));
}Output:
Sat Mar 24 10:11:38 CET 2007
Sat Mar 24 11:11:38 CET 2007
Sat Mar 24 12:11:38 CET 2007
Sat Mar 24 13:11:38 CET 2007
Sat Mar 24 14:11:38 CET 2007
Sat Mar 24 15:11:38 CET 2007
Sat Mar 24 16:11:38 CET 2007
Sat Mar 24 17:11:38 CET 2007
Sat Mar 24 18:11:38 CET 2007
Sat Mar 24 19:11:38 CET 2007
Sat Mar 24 20:11:38 CET 2007
Sat Mar 24 21:11:38 CET 2007
Sat Mar 24 22:11:38 CET 2007
Sat Mar 24 23:11:38 CET 2007
Sun Mar 25 00:11:38 CET 2007
// HERE AGAIN !!!
Sun Mar 25 01:11:38 CET 2007
Sun Mar 25 03:11:38 CEST 2007
Sun Mar 25 04:11:38 CEST 2007
Sun Mar 25 05:11:38 CEST 2007
Sun Mar 25 06:11:38 CEST 2007
Sun Mar 25 07:11:38 CEST 2007
Sun Mar 25 08:11:38 CEST 2007
Sun Mar 25 09:11:38 CEST 2007
Sun Mar 25 10:11:38 CEST 2007
Sun Mar 25 11:11:38 CEST 2007
Sun Mar 25 12:11:38 CEST 2007
Sun Mar 25 13:11:38 CEST 2007
Sun Mar 25 14:11:38 CEST 2007
Sun Mar 25 15:11:38 CEST 2007
Sun Mar 25 16:11:38 CEST 2007
Sun Mar 25 17:11:38 CEST 2007
Sun Mar 25 18:11:38 CEST 2007
Sun Mar 25 19:11:38 CEST 2007
Sun Mar 25 20:11:38 CEST 2007
Sun Mar 25 21:11:38 CEST 2007
Sun Mar 25 22:11:38 CEST 2007
Sun Mar 25 23:11:38 CEST 2007
Mon Mar 26 00:11:38 CEST 2007
Mon Mar 26 01:11:38 CEST 2007
Mon Mar 26 02:11:38 CEST 2007
Mon Mar 26 03:11:38 CEST 2007
Mon Mar 26 04:11:38 CEST 2007
Mon Mar 26 05:11:38 CEST 2007
Mon Mar 26 06:11:38 CEST 2007
Mon Mar 26 07:11:38 CEST 2007
Mon Mar 26 08:11:38 CEST 2007
Mon Mar 26 09:11:38 CEST 2007
Mon Mar 26 10:11:38 CEST 2007
Mon Mar 26 11:11:38 CEST 2007
Mon Mar 26 12:11:38 CEST 2007
Any help will be appreciated. -
I am using Solaris 9 on Sun hardware. I have set the Time Zone as Asia/Karachi. I dont know how the Daylight Saving Time is enabled with this setting. I just want DST to Trun Off. How can I disable DST for my zone?
Thank you for all the reply. Finally, I've solved the problem. For Tunisia there is no DST according to this page: http://www.timeanddate.com/worldclock/timezone.html?n=253&syear=2010
So, I did the followings:
# vi /usr/share/lib/zoneinfo/src/africa
I modified the rules according to the following:
Rule Tunisia 2006 2008 - Mar lastSun 2:00s 1:00 S
Rule Tunisia 2006 2008 - Oct lastSun 2:00s 0 -
Finally I run the following command:
# zic /usr/share/lib/zoneinfo/src/africa
It is solved my problem!
BR,
Gyorgy
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