RE: JavaMail API: SentDate problem

["Gary L Peskin" <garyp@xxxxxxxxxxxx>]

QTIME is supposed to be set to the current local time, not GMT.  IBM
recommends that you change QUTCOFFSET whenever you adjust QTIME for
things like BST going on and off
(http://publib.boulder.ibm.com/cgi-bin/bookmgr/BOOKS/QB3ALG03/2.3.123).
So, your QTIME is set correctly.  It is your QUTCOFFSET that is the
problem.

As far as the semiannual manual adjustment, this is made to QTIME
already so you just need to make sure that QUTCOFFSET is changed at the
same time.  There are some freeware tools that submit jobs to make these
adjustments automatically.  But whatever you're doing to maintain QTIME
should probably maintain QUTCOFFSET as well.

The changeover dates are not held inside the JVM.  The changeover rules,
however, are.  BST goes on at 1:00 am GMT on the last Sunday in March.
It goes off at 1:00 am GMT on the last Sunday in October.

HTH,
Gary

> -----Original Message-----
> From: java400-l-admin@midrange.com
> [mailto:java400-l-admin@midrange.com] On Behalf Of
> Keith_McCully@wunderman.co.uk
> Sent: Tuesday, August 13, 2002 8:45 AM
> To: java400-l@midrange.com
> Subject: RE: JavaMail API: SentDate problem
>
>
>
>
>
> Gary,
>
> Thanks for the follow up. I checked QUTCOFFSET and , sure
> enough, it's set at the shipped value of +00:00 ie. GMT.
> However, before setting to +01:00 (BST) I'll check that it
> won't impact anyone else. The only downside to this is the
> biannual manual adjustment.
>
> I'm not sure but I suspect that the JVM time would adjust
> automatically and correctly after having set the timezone to
> "Europe/London" AND with QTIME always set to GMT. I also
> assume that the GMT/BST changeover dates are known for some
> years to come and held somewhere within the JVM?  Ideally,
> I'd prefer this option (if correct) but this is not possible
> since other applications require QTIME to be adjusted between
> GMT and BST.
>
> Regards,
>
> Keith
>
>
>
>
>
>
>
> "Gary L Peskin" <garyp@firstech.com> on 09/08/2002 09:35:27
>
> Please respond to java400-l@midrange.com
>
> To:   java400-l@midrange.com
> cc:    (bcc: Keith McCully/Wunderman/GB)
>
> Subject:  RE: JavaMail API: SentDate problem
>
>
>
> Keith --
>
> You might want to check QUTCOFFSET as well. It's supposed to
> be set to the offset from GMT so in your case that would be
> +1.  QTIME is supposed to be set to the local time and
> QUTCOFFSET to the
> current GMT offset.  I think this could fix your problem.
>
> You'll need to remember to change QUTCOFFSET back to zero
> when you go off of Summer Time.
>
> Also, I'm not sure what else this will affect.  The Work
> Management book says it's used for intersystem time
> reconciliation but I'm not sure who else your 400 is connected to.
>
> If you have a test box available, it might be worth fiddling with.
>
> Gary
>
> > -----Original Message-----
> > From: java400-l-admin@midrange.com
> > [mailto:java400-l-admin@midrange.com] On Behalf Of
> > Keith_McCully@wunderman.co.uk
> > Sent: Wednesday, August 07, 2002 6:54 AM
> > To: java400-l@midrange.com
> > Subject: RE: JavaMail API: SentDate problem
> >
> >
> >
> >
> >
> > I have added user.timezone=Europe/London to the file
> > SystemDefault.properties in /QIBM/UserData/Java400.
> >
> > I tried:
> >
> > Calendar z = new GregorianCalendar(TimeZone.getDefault());
> > System.out.println(z.getTime().toString()); // current date/time
> >
> > getting: Wed Aug 07 15:05:02 GMT+01:00 2002. So the time
> zone portion
> > is now correct (BST = GMT+01:00) although the actual time is now 1
> > hour ahead. Request time was 14:05:02. It seems as if the
> JVM assumes
> > the base time for the zone is without daylight saving (GMT
> in my case)
> > and then the daylight adjustment is applied on top.
> However, since our
> > AS/400 system time (QTIME) has already been adjusted for BST an
> > extra hour has been added. There's no way I'll set QTIME to
> > GMT due to the massive impact elsewhere! Instead I'll go for
> > a workaround since the time zone part is now correct. The
> > current date can be tested for daylight saving in effect by
> > using the inDaylightTime method for the default TimeZone.
> >
> > Regards,
> >
> > Keith
>
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