Re: DST PTF(s) for V5R1?

[Dennis <iseries@xxxxxxxxxxxx>]

See, that's one way to handle it.  Another, is to use the GMT (or UCT) as the starting point, and represent the local time from there.  In your scenario, there is no way to know exactly how long the process took.  With the other way it is simple math against UCT.
++
Dennis
++
 "A lie can travel half way around the world while the truth is putting on its shoes."
     -- Mark Twain 


 

Sent from my Galaxy tablet phone.  Please excuse my brevity.
For any grammatic/spelling errors, there is no excuse.
++


"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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