DST Update

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Daylight Standard Saving Time Change for 2007

On August 8, 2005, the U.S. Congress passed the Energy Policy Act of 2005. The Act changed the beginning and end dates for Daylight Saving Time (DST) in the U.S. Beginning in 2007, DST will begin the second Sunday in March and end the first Sunday in November. In 2007, Daylight Savings Time will take effect on March 11th and end November 4th.

The change may affect certain computer devices and applications. The personal computer software supported by Information Technology at Stevens that may be affected includes Microsoft Windows and Microsoft Office Outlook Calendar.

This document first describes how the DST changes may affect Stevens personal computer operating systems, providing specific information and links to additional information. Next, it describes an issue of concern to Microsoft Outlook Calendar users and ends with some relevant links for handheld users, and users of java-based applications.

If you have questions about the implications of the DST changes in your particular situation, contact the Help Desk at http://www.stevens.edu/helpdesk or 201-216-5500.

Windows Operating Systems

Some faculty and staff personal computers at Stevens are managed by Information Technology. Operating system, virus protection and application software updates are remotely applied to these systems without user intervention when they are attached to the Stevens network. If you use a personal computer managed by Information Technology, and it is connected to the Stevens network, DST updates will be applied. Students and faculty and staff who have unmanaged personal computers, including computers at home, are responsible for their own computer software maintenance.

The effect of the DST change on Windows users depends on whether applications sensitive to time zone settings are used. One example of such software is the Microsoft Outlook Calendar (see the section below). In many instances, if no action is taken, the only result that will be noticed is that the computer may not automatically adjust for DST on March 11th and November 4th.

Managed Windows Personal Computers

Windows XP SP2

Information Technology has already applied the Microsoft supplied DST update if your computer has been attached to the Stevens network. If you have a notebook that has not been attached to the Stevens network, you should attach it for a day so updates may be applied, or see the section below, “Unmanaged Personal Computers.”

Windows 2000

Microsoft has not released a patch for Windows 2000. There is a Microsoft utility that can be used to adjust time zone settings, but Information Technology has determined that except for users of Microsoft Outlook Calendar, there isn’t a compelling reason to do so, since your computer clock will be set correctly when you logon to the campus domain. Outlook Calendar users should contact the Help Desk to assess what steps might be required to correct appointment dates.

Unmanaged Windows Personal Computers

General information about the DST change and Microsoft applications can be found at Preparing for Daylight Saving Time changes in 2007.

To confirm your Windows version, right-click on the "My Computer" icon (on the desktop or in the Start menu) and note the "System:" information listed at the top of the column of information/text on the right side of the window that appears. The following only covers Windows XP and 2000. Additionally, the instructions for XP pertain specifically to SP2. If you are running an older version, you should update.

Windows XP SP2

Verify that the patch has been installed:

  1. Start the Internet Explorer browser.
  2. Under the Tools menu select Windows Update.
  3. On the left side of the Windows Update Web page under "Options" click "Review your update history". The most recent updates are listed first.
  4. If the DST KB931836 fix has been installed, it should be in the history list as “Update for Windows XP (KB931836)” with a "green circle/disk and check mark" in the status column.

If the patch is not installed, and you wish to install it:

  1. Launch Internet Explorer.
  2. Select "Windows Update" from the Tools menu.
  3. Once you are directed to the Microsoft Windows Update page, select the "Express" install button. You will be linked to the Express Results page where all "High Priority Updates" are listed.
  4. Update for Windows XP (KB931836) should appear in the list. Click "Install Updates" to receive all of the updates listed.
  5. You may need to restart your computer.

Windows 2000

Microsoft has not released a DST patch for Windows 2000. There is a Microsoft utility called the “Time Zone Editor” that can be used to manually adjust time zone settings. Microsoft recommends using the tool, but depending on your situation, it may not be essential.

If you have the required privileges on your computer and wish to use the tool, you can follow these steps:

  1. Download Microsoft's TZEDIT.EXE tool.
  2. After downloading, double-click the TZEDIT.EXE file and allow it to run (if prompted).
  3. Click the "Unzip" button and it will expand the actual tool into the following location: C:\Program Files\TZEdit
  4. Navigate to the above location and double-click the TZEDIT.EXE file.
  5. In the window that appears, select the normal EST time (it may already be selected) and click the "New" button.
  6. Enter the following information: Time Zone Name: (GMT-05:00) Eastern Time (US 2007+); Abbreviation: Eastern Standard Time (US 2007+); Offset from GMT: -05:00; CHECK the Automatically set Daylight Saving Time box; Start Day: Second Sunday of March at 2:00:00 AM; Last Day: First Sunday of November at 2:00:00 AM; Abbreviation: Eastern Daylight Time (US 2007+); Daylight Bias: +1:00
  7. Click the "OK" button.
  8. Close the TZEDIT program by clicking the small "X" in the upper-right corner of its window (do NOT click the "Cancel" button).
  9. Double-click on the clock in the lower-right corner of your screen to open the "Date and Time Properties" window (or open "Date and Time" via the Control Panel(s) area).
  10. Click the "Time Zone" tab and select "(GMT-05:00) Eastern Time (US 2007+)" from the pop-up/drop-down menu.
  11. Check the "Automatically adjust clock for daylight saving changes" box.
  12. Click the "Apply" button and the "OK" button (or just the "OK" button).

Macintosh Operating Systems

Information about the 2007 time zone updates for Apple systems can be found here.

Linux Operating Systems

On most Linux distributions, the following command will display the current time zone settings:

/usr/sbin/zdump -v /etc/localtime | grep 2007

Obtain an update from your distribution source if not current.

Microsoft Outlook Calendar

Note: Individuals who use Campus Pipeline to manage their calendars do not have to take any special action.

Managed Windows Personal Computers

Microsoft Outlook Calendar users should contact the Help Desk at www.stevens.edu/helpdesk or 201-216-5500 to evaluate if their calendar needs to be updated.

Unmanaged Windows Personal Computers

Outlook Calendar users should carefully verify appointments scheduled for the "new" DST days, not only in 2007, but in future years if you schedule that far in advance. The critical times are between the 2nd Sunday in March and the first Sunday in April and between the last Sunday in October and the first Sunday in November, specifically, for 2007, from March 11 through April 1, and October 28 through November 4.

Microsoft recommends the following when scheduling appointments throughout these date ranges only after the fix for your windows version has been applied. (See the Operating Systems section above for instructions on how to check your computer.)

After the OS update is applied, appointment times will be one hour later than originally scheduled during the extended DST periods, and all-day events will span two days.

To manually change your calendar, follow these steps:

  1. Print a copy of your calendar during the extended DST period for reference
  2. Manually move single-instance appointments to the correct time.
  3. Manually move all-day events to span only one day
  4. Perform the same procedure on handheld devices that synchronize with Outlook Calendar. (See the section below for information about handheld devices.)

Microsoft has released a utility to programmatically make the above changes, but unless you have a many appointments that fall within the “new” DST time frames, it may be simpler to make the changes manually as described above. Information about the DST changes, their impact on Outlook Calendar and the Microsoft tool can be found at "How to address the daylight saving time changes in 2007 by using the Time Zone Data Update Tool for Microsoft Office Outlook." Contact the Help Desk at http://www.stevens.edu/helpdesk or 201-216-5500 if you require assistance.

Handheld Devices

Contact the Help Desk at www.stevens.edu/helpdesk or 201-216-5500 if you have a Stevens supported handheld and would like assistance assessing the need for an update, or applying an update.


Information about the DST change and its impact for Blackberry users can be found at http://www.blackberry.com/select/dst2007/. The most relevant information for Stevens users is at http://www.blackberry.com/select/dst2007/resolutions/internetservice/.

Palm OS

At this time, Palm hasn’t released an update for this issue.

Microsoft Mobile 2003, Mobile Second Edition and Mobile 5.0 and Pocket PC

Instructions for updating you Windows Mobile device can be found at http://www.microsoft.com/windowsmobile/daylightsaving/default.mspx.


Java Applications

Java runtimes and SDK’s are also affected by the DST change. Although not installed as part of the base Stevens PC distribution, some users may have installed java-based applications and therefore may be affected. Information about the issue is at http://java.sun.com/javase/tzupdater_README.html#INTRODUCTION.

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