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Date:      Fri, 2 Feb 2007 22:06:42 -0500
From:      John Nielsen <lists@jnielsen.net>
To:        freebsd-questions@freebsd.org
Cc:        Robert Fitzpatrick <lists@webtent.net>
Subject:   Re: Determining daylight savings changes on BSD
Message-ID:  <200702022206.43429.lists@jnielsen.net>
In-Reply-To: <20070202223500.GI44511@dan.emsphone.com>
References:  <1170430862.16189.8.camel@columbus.webtent.org> <1170455418.16189.42.camel@columbus.webtent.org> <20070202223500.GI44511@dan.emsphone.com>

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On Friday 02 February 2007 17:35, Dan Nelson wrote:
> In the last episode (Feb 02), Robert Fitzpatrick said:
> > On Fri, 2007-02-02 at 10:36 -0600, Dan Nelson wrote:
> > > In the last episode (Feb 02), Robert Fitzpatrick said:
> > > > I use the following command on our CentOS Linux servers to find
> > > > out if the system is ready for the daylight savings changes
> > > > coming up, but it does not seem to work the same on our FreeBSD
> > > > 5.4 and 6.1 servers. How can I do this? I see the zdump command
> > > > and the man page seems to suggest the same usage, but...
> > > >
> > > > esmtp# zdump -v US/Eastern | grep 2007
> > > > esmtp# zdump -v US/Eastern
> > > > US/Eastern  Fri Dec 13 20:45:52 1901 UTC = Fri Dec 13 20:45:52 1901
> > > > UTC isdst=0 gmtoff=0 US/Eastern  Sat Dec 14 20:45:52 1901 UTC = Sat
> > > > Dec 14 20:45:52 1901 UTC isdst=0 gmtoff=0 US/Eastern  Mon Jan 18
> > > > 03:14:07 2038 UTC = Mon Jan 18 03:14:07 2038 UTC isdst=0 gmtoff=0
> > > > US/Eastern  Tue Jan 19 03:14:07 2038 UTC = Tue Jan 19 03:14:07 2038
> > > > UTC isdst=0 gmtoff=0
> > >
> > > That means you need to update your zoneinfo tables.  You can also use
> > > the date command to see if you need updating:
> > >
> > > date -r 1173679260
> >
> > Yes, thanks, looks like I need to do that, how do I update my zoneinfo
> > tables?
>
> Upgrading to 5.5 or 6.2 will get you the new tables as a side-effect of
> the upgrade :)  If you don't want to upgrade, just install the
> misc/zoneinfo port and rerun tzsetup.

The last bit (rerunning tzsetup(8)) is good advice for anyone who hasn't run 
it in a while. Upgrading from earlier versions of FreeBSD will install the 
new tzdata files but it will not touch /etc/localtime.

JN



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