Re: DST PTF(s) for V5R1? -- MIDRANGE-L

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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