If you haven't been living under a rock for the past year, you might know that daylight savings time (DST) is changing.  From The Energy Policy Act of 2005:

The bill amends the Uniform Time Act of 1966 by changing the start and end dates of daylight saving time starting in 2007. Clocks will be set ahead one hour on the second Sunday of March (March 11, 2007) instead of the current first Sunday of April (April 1, 2007). Clocks will be set back one hour on the first Sunday in November (November 4, 2007), rather than the last Sunday of October (October 28, 2007). This will make electronic clocks that had pre-programmed dates for adjusting to daylight saving time obsolete and will require updates to computer operating systems.

Along with possibly fattening up your kids by increasing daylight on Halloween, this requires most operating systems to be patched to compensate for the whims of the US government.  Some Unix-like systems can be patched by doing the following:

• Gentoo GNU/Linux: emerge sync && emerge sys-libs/timezone-data, assuming you're on a current profile
• Debian and Ubuntu GNU/Linux: apt-get update && apt-get install tzdata
• FreeBSD (other than >= 6.2): portinstall misc/zoneinfo or sync sources and rebuild world
• Solaris 10 for SPARC: Grab patches 124630-03 and 119081-25 (or later) from Sun

Those are really the only operating systems I care about.  I couldn't test the Solaris patch, since little ol' me doesn't have an expensive support contract, and 119081-25 isn't available to the general public.  I suppose my Ultra 10 will have to suffer for a few weeks.  Pity.

Network gear is affected, too.  However, I suggest just switching to UTC, as it'll make your life easier.

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