[svlug] revised timezone info posted Feb 26

[Prasad Paranjape]

Hi Sameer,

The article on the TechRublic was useful in updating
the zoneinfo files on my Slackware 8.0 box.

Thanks.

Regards,

Prasad
--- Sameer Verma <sverma at sfsu.edu> wrote:

> Brian J. Tarricone wrote:
> > On Thu, 01 Mar 2007 11:30:48 -0800 Rick Kwan
> wrote:
> >
> >   
> >> I just updated my machine at work for the new
> Daylight Savings Time,
> >> which starts March 11, and ran into a little
> surprise along the way.
> >> Many web pages
> >> say to grab the new timezone file via:
> >>    wget
> ftp://elsie.nci.nih.gov/pub/tzdata2007b.tar.gz
> >> That file no longer exists; it has been replaced
> by
> >> 'tzdata2007c.tar.gz'. Internally, it looks like
> 'northamerica' was
> >> updated on Feb. 26, 2007.
> >>
> >> There is an article at TechRepublic:
> >>   
>
http://articles.techrepublic.com.com/5100-10877_11-6163042.html
> >> which shows the following example for Mountain
> Time after update.
> >> --------
> >> /etc/localtime  Sun Mar 11 08:59:59 2007 UTC =
> Sun Mar 11 02:59:59
> >> 2007 MST isdst=0 gmtoff=-25200
> >> /etc/localtime  Sun Mar 11 09:00:00 2007 UTC =
> Sun Mar 11 04:00:00
> >> 2007 MDT isdst=1 gmtoff=-21600
> >> /etc/localtime  Sun Nov  4 07:59:59 2007 UTC =
> Sun Nov  4 02:59:59
> >> 2007 MDT isdst=1 gmtoff=-21600
> >> /etc/localtime  Sun Nov  4 08:00:00 2007 UTC =
> Sun Nov  4 02:00:00
> >> 2007 MST isdst=0 gmtoff=-25200
> >> --------
> >>
> >> But when I execute the following command for
> Mountain Time
> >>    /usr/sbin/zdump -v /usr/share/zoneinfo/MST7MDT
> | grep 2007
> >> I get something different:
> >> --------
> >> /usr/share/zoneinfo/MST7MDT  Sun Mar 11 08:59:59
> 2007 UTC = Sun Mar 11 
> >> 01:59:59 2007 MST isdst=0 gmtoff=-25200
> >> /usr/share/zoneinfo/MST7MDT  Sun Mar 11 09:00:00
> 2007 UTC = Sun Mar 11 
> >> 03:00:00 2007 MDT isdst=1 gmtoff=-21600
> >> /usr/share/zoneinfo/MST7MDT  Sun Nov  4 07:59:59
> 2007 UTC = Sun Nov  4 
> >> 01:59:59 2007 MDT isdst=1 gmtoff=-21600
> >> /usr/share/zoneinfo/MST7MDT  Sun Nov  4 08:00:00
> 2007 UTC = Sun Nov  4 
> >> 01:00:00 2007 MST isdst=0 gmtoff=-25200
> >> --------
> >> Note the assignments of UTC to MST.  The two sets
> of results
> >> differ by an hour, but "gmtoff" is unchanged.
> >>
> >> I assume that Linux basically ignores local time,
> and runs all its time
> >> services off of UTC.  If that's not true, then
> things might be really
> >> interesting. :-)
> >>
> >> Anyone have better insight into this?
> >>     
> >
> > The difference between the two isn't in the
> offset, it's in the time
> > that the switch occurs.  The TechRepublic example
> has the time change
> > wait until 3am, at which time your clock will jump
> forward to 4am
> > (which I believe is incorrect).
> >
> >   
> I can attest to this. It switches from 1:59:59 am to
> 3:00:00 am. I was 
> awake, doing some work, so I actually saw it change
> that way :-)
> 
> Sameer
> > The one you downloaded for your system will jump
> to 3am when your clock
> > hits 2am.  My understanding is that this case is
> correct.  At least,
> > according to Wikipedia[1], "the time is adjusted
> at 2 AM local time."
> >
> > For what it's worth, the PST8PDT zone info file on
> my system (Gentoo)
> > seems to agree with yours (switching at 2am).
> >
> > 	-brian
> >
> >
>
[1]http://en.wikipedia.org/wiki/Daylight_saving_time_around_the_world#United_States
> >
> > _______________________________________________
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> > svlug at lists.svlug.org
> > http://lists.svlug.org/lists/listinfo/svlug
> >   
> 
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