Determining daylight savings changes on BSD
Robert Fitzpatrick
lists at webtent.net
Fri Feb 2 22:31:38 UTC 2007
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?
esmtp# zdump -v EST5EDT | grep '200[67]'
EST5EDT Sun Apr 2 06:59:59 2006 UTC = Sun Apr 2 01:59:59 2006 EST isdst=0 gmtoff=-18000
EST5EDT Sun Apr 2 07:00:00 2006 UTC = Sun Apr 2 03:00:00 2006 EDT isdst=1 gmtoff=-14400
EST5EDT Sun Oct 29 05:59:59 2006 UTC = Sun Oct 29 01:59:59 2006 EDT isdst=1 gmtoff=-14400
EST5EDT Sun Oct 29 06:00:00 2006 UTC = Sun Oct 29 01:00:00 2006 EST isdst=0 gmtoff=-18000
EST5EDT Sun Apr 1 06:59:59 2007 UTC = Sun Apr 1 01:59:59 2007 EST isdst=0 gmtoff=-18000
EST5EDT Sun Apr 1 07:00:00 2007 UTC = Sun Apr 1 03:00:00 2007 EDT isdst=1 gmtoff=-14400
EST5EDT Sun Oct 28 05:59:59 2007 UTC = Sun Oct 28 01:59:59 2007 EDT isdst=1 gmtoff=-14400
EST5EDT Sun Oct 28 06:00:00 2007 UTC = Sun Oct 28 01:00:00 2007 EST isdst=0 gmtoff=-18000
--
Robert
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