[nflug] Daylight saviings time

David J. Andruczyk djandruczyk at yahoo.com
Wed Feb 21 21:21:30 EST 2007


ntpdate will NOT fix the issue with APPLICATIONS that use the C
library and zoneinfo  (i.e. everything) to determine time...

--- matt donovan <kitchetech at gmail.com> wrote:

> 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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-- David J. Andruczyk


 
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