Re: Time change this weekend

[Bruce Vining <bvining@xxxxxxxxxxxxxxx>]

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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