Starting in 2007, the dates that daylight savings time begins and ends is changing in the US and other countries. For FreeBSD it seems versions 6.2 and higher should already know about the new DST dates. A machine can be checked with
zdump -v /etc/localtime | grep 2007
A machine with the old DST settings will show lines that begin with:
/etc/localtime Sun Apr 1 07:59:59 2007 /etc/localtime Sun Apr 1 08:00:00 2007 /etc/localtime Sun Oct 28 06:59:59 2007 /etc/localtime Sun Oct 28 07:00:00 2007
which is wrong, (April 1st and Oct 28th). A machine that's correct should show:
/etc/localtime Sun Mar 11 07:59:59 2007 /etc/localtime Sun Mar 11 08:00:00 2007 /etc/localtime Sun Nov 4 06:59:59 2007 /etc/localtime Sun Nov 4 07:00:00 2007
March 11th and Nov 4th being the new days that DST switches.
Updating a FreeBSD box seems to be just a matter in installing the
port, and then running the
tzsetup command which gives you menus to pick your
this blog has links for info on updating other OSes.