Re: DST PTF(s) for V5R1?

[Jeff Crosby <jlcrosby@xxxxxxxxxxxxxxxx>]

There is no 'slowdown' in the fall, nor is there a 'speedup' in the spring.

It is an instant (within reason) change.

Job scheduler jobs run once and only once, whether it was a spring forward
or fall back.  It's some kind of UTC (Universal Time Coordinate) thing for
which I am totally unqualified to explain.

All I know is that it works.



On Mon, Nov 7, 2011 at 10:54 AM, Luis Rodriguez <luisro58@xxxxxxxxx> wrote:

> Dennis,
>
> Suppose you have a process that begins at, say 01:00am and runs in less
> than an hour. If you change your clock back one hour, it could happen that
> your process would end before it begins (FTL neutrinos anyone? :-) )
>
> To avoid that, beginning (IIRC) V5R3, the systems "slows down" the clock,
> so it just does the 1-hour time adjust in, say, two hours. After that, the
> clock starts to run at the normal rate.
>
> Hope this makes sense.
>
> Regards,
>
>
> Luis Rodriguez
> IBM Certified Systems Expert — eServer i5 iSeries
> --
>
>
>
>
> On Mon, Nov 7, 2011 at 10:44 AM, Dennis <iseries@xxxxxxxxxxxx> wrote:
>
> > Hopefully that "gradual" part is incorrect, and the system - like the
> rest
> > of the non-personal computer systems in the world - merely
> > "decodes/represents" the time differently rather than actually changing
> any
> > clock.  Nowadays, most systems use the applicable UCT offset to determine
> > what the local time is/was.
> >
> > Can anyone here confirm the internal process?
> > ++
> > Dennis
> > ++
> >  "I'm a great believer in luck, and I find the harder I work the more I
> > have of it."
> >     -- Thomas Jefferson
> >
> >
> >
> >
> > Sent from my Galaxy tablet phone.  Please excuse my brevity.
> > For any grammatic/spelling errors, there is no excuse.
> > ++
> >
> >
> > "Jerry C. Adams" <midrange@xxxxxxxx> wrote:
> >
> > > An off-list reply mentioned that DST support may not have been added
> > > until
> > > V5R3 and enhanced in V5R4.  And a search of PTF cover letters shows
> > > nothing
> > > older than 5.3.
> > >
> > > The "nice" thing about having the system change the time, especially in
> > > the
> > > fall, if I recall correctly, is that the adjustment is gradual, not
> > > instantaneous like I did.  A quick change could have an adverse effect
> > > on
> > > things like journals.  But ya do what ya gotta do, I guess.
> > >
> > > Jerry C. Adams
> > > IBM i Programmer/Analyst
> > > Everything that can be invented, has been invented. -Charles Duell,
> > > U.S.
> > > Patent Office Director (1899)
> > > --
> > > A&K Wholesale
> > > Murfreesboro, TN
> > > 615-867-5070
> > >
> > > -----Original Message-----
> > > From: midrange-l-bounces@xxxxxxxxxxxx
> > > [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Paul Nelson
> > > Sent: Monday, November 07, 2011 8:05 AM
> > > To: 'Midrange Systems Technical Discussion'
> > > Subject: RE: DST PTF(s) for V5R1?
> > >
> > > I don't recall which release introduced the link to an SNTP server, but
> > > you
> > > could whip up a program to change the time for you. Stick it in the job
> > > scheduler to run on Sunday mornings, and have it read a 1 record file
> > > containing the actual dates to increase or decrease QHOUR. Plug in the
> > > dates
> > > in January, and you're done for the year.
> > >
> > >
> > >
> > > Paul Nelson
> > > Office 512-392-2577
> > > Cell 708-670-6978
> > > nelsonp@xxxxxxxxxxxxx
> > >
> > >
> > > -----Original Message-----
> > > From: midrange-l-bounces@xxxxxxxxxxxx
> > > [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jerry C. Adams
> > > Sent: Monday, November 07, 2011 7:25 AM
> > > To: Midrange-L
> > > Subject: DST PTF(s) for V5R1?
> > >
> > > I'm pretty sure that this is a futile question, but, hey, nothing
> > > ventured.
> > >
> > >
> > >
> > > Yesterday afternoon (Sunday, 6 November) I checked our iSeries machine,
> > > which is running V5R1.  The time had not changed.  Since no one works
> > > on the
> > > system on weekends, I changed the time manually.  Is there a PTF
> > > *still*
> > > available for 5.1 regarding Daylight Savings Time?  Our office admin
> > > and I
> > > were trying to remember if anyone had to do anything for DST back in
> > > the
> > > Spring, but I'm old and she's blonde, ergo neither of us could recall
> > > anyone
> > > doing a manual change.
> > >
> > >
> > >
> > > I suspect that I'm stuck with changing the time manually from here on
> > > out.
> > >
> > >
> > >
> > > Jerry C. Adams
> > >
> > > IBM i Programmer/Analyst
> > >
> > > The game was closer than the score indicated. -Dizzy Dean on a 1-0 ball
> > > game
> > >
> > > --
> > >
> > > A&K Wholesale
> > >
> > > Murfreesboro, TN
> > >
> > > 615-867-5070
> > >
> > >
> > >
> > > --
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