[nflug] Daylight saviings time

matt donovan kitchetech at gmail.com
Wed Feb 21 17:57:33 EST 2007


well I have to rebuild my whole system but they say that ntpdate will fix it

On 2/21/07, Robert Meyer <meyer_rm at yahoo.com> wrote:
>
>  This is not true.  Linux/Unix thinks in GMT (UTC for time buffs).  When
> dates are reported, the library call uses the timezone information from the
> system to convert it to localtime on the fly.  If your system's library
> routines (in Unix/linux the timezone files) aren't correct for the timezone
> change differences, you will have a system that reports the time incorrectly
> after the DST change.  So for three weeks, your clock will be off.  If you
> force the clock to show the correct value, then the system's concept of GMT
> will be off by an hour.  ntpdate will do everything in GMT on a Linux/Unix
> box.  It will try to set the system's clock to the proper GMT which means
> that localtime routines will be off.
>
> Lots of apps use local time to do things, such as cron or any calendering
> app.  Failure to fix the timezone data will cause those apps to be wrong.
>
> I know this 'cuz I just had to patch a whole pile of machines at work,
> lest our apps start doing stupid things.
>
> Cheers!
>
> Bob
>
> ----- Original Message ----
> From: matt donovan <kitchetech at gmail.com>
> To: nflug at nflug.org
> Sent: Wednesday, February 21, 2007 12:55:54 PM
> Subject: Re: [nflug] Daylight saviings time
>
> if you use another distro just use ntpdate and you should be fine that's
> how I m doing it.
>
> On 2/15/07, Mark T. Valites < mark-nflug at valites.net> wrote:
> >
> > On Thu, 15 Feb 2007, anthonyriga wrote:
> >
> > > With the new DST enacted this year will that have any affect on Linux
> > to
> > > know the changes?
> > >
> > > Sent Using Ubuntu Linux Operating System Edgy 6.10
> >
> > Your Ubuntu 'tzdata' package already has the updated timezone info.
> >
> > For Redhat, this was taken care of with the following tzdata updates:
> >
> > tzdata-2005m-1.EL3 (http://rhn.redhat.com/errata/RHEA-2005-655.html)
> > tzdata-2005m-1.EL4 (http://rhn.redhat.com/errata/RHEA-2005-656.html )
> >
> > which were issued shortly after the Energy Policy Act of 2005 that
> > included these changes was passed.
> >
> > For Sun:
> >
> > http://sunsolve.sun.com/search/document.do?assetkey=1-26-102178-1
> >
> > I don't have the URL for Debian/Ubuntu offhand though.
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> >
>
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