Re: Time change this weekend

Dennis,

The i system (assuming you are on a current release) is UTC based
internally. Local times are returned to the users based on offsets from UTC.
So from a system (Licensed Internal Code) point of view you are correct --
time doesn't repeat. HOWEVER, and might I repeat that capital HOWEVER, I
have seen very few applications on the system that use UTC time values. Just
about every application I've ever seen (and a significant amount of the i
operating system) uses system time as in QTIME and/or job time. QTIME most
assuredly does repeat if the DST rules call for a change from say 2:00AM to
1:00AM.

I believe work on moving some of the i operating system to UTC was done in
V6R1, but that more work continues to be needed.

Bruce Vining

On Thu, Oct 29, 2009 at 1:09 PM, Dennis Lovelady <iseries@xxxxxxxxxxxx>wrote:

Yes.
http://www.timeanddate.com/time/aboutdst.html

The i does not repeat time, the clock crawls.

Hi, Rob:

That article specifically says, "Note that local time from 1:00:00 to
1:59:59 is repeated this day." On the other hand, that article is not
about
the i system.

I would dearly love to see such documentation, especially since my
upbringing and experiences tell me that the article is correct (but not
whether current IBM technology follows this).

On unix systems (at least those that I have administered in the past) it is
a change to the UTC offset. Since all (OK, most) times stored by unix
systems are GMT based, this is not a repeat of time. I'm betting that
iSeries works the same way. But like I said, I'd love to see that
officially confirmed or denied.


Dennis Lovelady
http://www.linkedin.com/in/dennislovelady
--
"The direct use of force is such a poor solution to any problem, it is
generally employed only by small children and large nations."
-- David Friedman



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