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  3. November 2011

Re: DST PTF(s) for V5R1?

Disappointing, especially since the PITA factor didn't stop Linux (and other *ix) system designers from implementing the UTC method that simply works, and works simply. That had been solved long before OS400 V5R3 came along, and it's sad to hear that IBM did not follow suit. It's OK to stand alone if your solution is better, I think, but....
++
Dennis
++
The first meeting of the Apathy Society has been postponed due to lack of interest.



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,

I agree that if we could just use GMT as a common reference (ISO?) for
everything it would be just perfect. Unfortunately, DST can be, I
think, a
real PITA. I can't really speak from personal experience, as here in
Venezuela we are just near enough of the equator as to make that
unnecessary. I somewhat acquainted with the time adjustment issue
because
some years ago the government decided to go from -04:00GMT to -04:30GMT
(please don't ask).

As a closing point, let me just add the Infocenter paragraph concerning
this issue:

---------------------

*New time adjustment function*

Prior to V5R3, minor changes to system time involved replacing the
current
time with a new time value. The system time is located in iSeries
Navigator
in the Date and Time system values on the Time page. By changing the
system
time field, problems can arise because time can appear to jump forward
or
backward if jobs are accessing the time value before and after the time
change. Now, a time adjustment can be made where time gradually speeds
up
or slows down on the system in order to reach the desired time value.
See Updating
system
time<http://publib.boulder.ibm.com/infocenter/iseries/v5r3/topic/rzati/rzatiadjustsystime.htm>to
learn how to start a time adjustment and Time
adjustment<http://publib.boulder.ibm.com/infocenter/iseries/v5r3/topic/rzati/rzatitimeadj.htm>to
learn more about time adjustments.

To make time adjustments, you must be using a version of OS/400 V5R3 or
later with V4R5 or later hardware.
---------------------

Best Regards,

Luis Rodriguez
IBM Certified Systems Expert — eServer i5 iSeries
--




On Mon, Nov 7, 2011 at 11:42 AM, Dennis <iseries@xxxxxxxxxxxx> wrote:

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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