Home users who wish to confirm the update has been applied can follow the steps in the Daylight Saving Time Update Guide at the Microsoft Daylight Saving Time Help and Support Center.
The best way to get the update is via Automatic Updates. However, according to Preparing for Daylight Savings Changes in 2007:
All versions of Windows can be manually updated using the tzedit.exe utility or other techniques documented in Knowledge Base article 914387 and similar articles for other countries, which is the preferred method of remediation for any product outside of Mainstream Support.The tzedit.exe utility is easy to use, although I do not know if it will work on unsupported versions of Windows. Please read Knowledge Base article 914387 for instructions on completing this update manually. To use the Time Zone edit utility:
- Download the tzedit.exe utility
- Backup your files and close all open programs.
- Navigate to where you saved the file and double-click to launch the file: WindowsXP-KB913446-x86-ENU.exe
- If you did not back up your files and close other programs, do so now and then click Next.
- As always, the standard license agreement must be accepted before proceeding.
- In addition to checking the system, with Windows XP, a restore point will be created. I did create my own restore point first, as I always do before making system changes.
- Click finish and its done!