Date: Fri, 2 Feb 2007 12:57:10 -0500 From: Jerry McAllister <jerrymc@msu.edu> To: Dan Nelson <dnelson@allantgroup.com> Cc: Robert Fitzpatrick <lists@webtent.net>, FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Determining daylight savings changes on BSD Message-ID: <20070202175710.GA98134@gizmo.acns.msu.edu> In-Reply-To: <20070202163637.GC44511@dan.emsphone.com> References: <1170430862.16189.8.camel@columbus.webtent.org> <20070202163637.GC44511@dan.emsphone.com>
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On Fri, Feb 02, 2007 at 10:36:37AM -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 I don't know how to read this. There was another command I saw a while back that gave similar looking information, but actually put out something for 2007. But, I can't find that mesage at the moment. > 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 > > If that prints "Mon Mar 12 02:01:00 EST 2007" you know you need to > update. Are you sure? I see the EST where mine says EDT, but mine gives the exact same date/time information as you show above outside of the EST. If I subtract out exactly one day (86400 seconds) I get: Sun Mar 11 01:01:00 EST 2007 which is just 59 minutes before the changeover. Then, if I add an hour (3600 seconds) I get: Sun Mar 11 03:01:00 EDT 2007 So, I would expect the non-updated system to give: Mon Mar 12 01:01:00 EST 2007 Or is something else really messed up? My system seems to be giving the correct current date/time. ////jerry > > -- > Dan Nelson > dnelson@allantgroup.com > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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