United States 2007 Daylight Saving Time Changes
Under the Energy Policy Act of 2005 starting in 2007 daylight saving
time in the United States will start three weeks earlier than in
previous years (2:00 AM on the second Sunday in March) and will end one
week later than in previous years (2:00 AM on the first Sunday in
The Time Zones for PCs®
database was updated for the 2007 daylight saving time changes for the
United States, Canada, and all other countries. This database is continually
kept up to date, and all updates are automatically sent to your PC.
However some people may experience problems with their installations of
Windows, as the Windows operating system itself may contain
out of date time zone data.
As a matter of good practice we recommend that all users set the clocks
on their PCs to Coordinated Universal Time (UTC). This avoids any time
time zone errors caused by Microsoft, and it allows you to travel
without continually having reset the time zone. You can set your PC to
UTC as follows:
Windows has a taskbar at the bottom of the screen. On the right of the
taskbar is your PC's clock:
To set the time and time zone, double-click on the time. This will bring
up the Date/Time Properties dialog box as shown here:
Click on the Time Zone tab to set the time zone.
To set your PC's clock to UTC, select UTC if it is
available, otherwise select the (GMT) Casablanca, Monrovia time zone.
Microsoft calls this Greenwich Standard Time.
Next click on the Date & Time tab.
Obtain the current Universal Time from
website. Pay particular attention to the date,
as this may be a day ahead or behind your local time.
Click OK to save the changes.
If you prefer to have your PC's clock set to local time rather than UTC,
and you live in the United States or Canada, you must read the following
Windows XP Update for 2007 DST Changes
Microsoft has released an update for Windows XP Service Pack 2.
If your computer is automatically updated via the Windows Update
service you do not need to do anything. The update will be automatically
downloaded and installed from Microsoft.
If you have turned off the Windows Update service on your
computer you will have to install the update manually.
Click on one of the download links below to download and run the Windows
Update for Windows XP (KB928388)
download via FTP:
download via HTTP:
(if FTP service is unavailable to you)
When prompted click Run to run the update, or click
Save to download it to your hard drive and then run
WindowsXP-KB928388-x86-ENU.exe as a separate step.
2007 DST Change Updates for Older Versions of Windows
Microsoft no longer supports Windows 95, 98, 98SE, NT 4.0, Me or 2000.
Therefore they will not be releasing updates for these versions of Windows.
Instructions from Microsoft for using the tzedit.exe utility
can be found here: