Re: Daylight Saving Time

Jeff,

One thing I've discovered by experience, if you're using SNTP you have to
have the QTIMZON value set correctly. SNTP will only make a change of up to
an hour, and the system talks to the NTP server in UTC time. If you have
the wrong QTIMZON value set your offset will be wrong and change required
will be more than an hour and fail.

Thanks

Adam Driver
Technical Consultant
Kaz Technology Services
www.kaz-group.com
Phone: +61 2 9844 0386
Fax: +61 2 9281 5261


date: Wed, 1 Feb 2006 10:27:28 -0600
from: "Haase, Justin C." <justin.haase@xxxxxxxxxxxx>
subject: RE: Daylight Saving Time

Even if you check with external, the time shift occurs automatically
with QN0500EST or EST2 (or any other zone if enabled), as indicated if
you click Edit... With your time zone selected, then click the Daylight
Saving Time tab.  Ensure "Enable Daylight Saving Time" is checked,
ensure the dates below are correct, and everything will work magically.

Always good to check on the systems those nights, though.  The automated
checker (SNTP client) will be **WAY** off, but since the system will
know a time adjustment is in-progress, it shouldn't even check anyway.
Then once you're done with the DST on/DST off, it'll continue to
reference the time source, and since your UTC offset changed, all should
be well on the next check.


--
Justin C. Haase - iSeries System Engineer
IBM Certified Systems Expert - eServer i5
Kingland Systems Corporation

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of rick baird
Sent: Wednesday, February 01, 2006 10:17 AM
To: Midrange Systems Technical Discussion
Subject: Re: Daylight Saving Time

back to the subject at hand,  I'm wondering about how this is done as
well.  I'm not responsible for making this shift anywhere, but I have
clients who are probably not even thinking about this.

I can swoop in and be the hero!

;)

On 2/1/06, Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx> wrote:
> I have never had to be concerned with this in the past, but the
> Indiana legislature has now decreed that Indiana will begin observing
DST this year.
>
> With the new time zone and especially time adjustment stuff available
> in V5R3, I thought it would be simple:  change the system value
> QTIMZON from
> QN0500EST2 to QN0500EST, the system will automajically start adjusting

> time before DST starts/ends, and I'm good to go, but it doesn't look
that simple.
>
> It doesn't look like 'time adjustment' takes place automatically at
> DST start/end at all.  What I think happens is that because my i5
> checks with an external time server every hour, the time will change
> in one fell swoop.  If I _don't_ check with an external time server,
it won't take place at all.
>
> Assuming I have already changed to time zone QN0500EST, it sounds like

> I need to:
>
> 1) On the Saturday before DST starts/ends, tell the i5 to stop
> checking externally for the time.
>
> 2) Start a time adjustment either forward (spring) or backward (fall)
> 1 hour.
>
> 3) On Monday, tell the i5 to start checking externally for the time
again.
>
> Am I right?  Or missing something simple?
>
> Thanks and I'll be moving to Arizona.
>
> --
> Jeff Crosby
> Dilgard Frozen Foods, Inc.
> P.O. Box 13369
> Ft. Wayne, IN 46868-3369
> 260-422-7531
>
> The opinions expressed are my own and not necessarily the opinion of
> my company.  Unless I say so.

Adam Driver
Technical Consultant
Kaz Technology Services
www.kaz-group.com
Phone: +61 2 9844 0386
Fax: +61 2 9281 5261