The Time on the Computer May Decrease by One Hour

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Microsoft ended support for Windows XP on April 8, 2014. This change has affected your software updates and security options. Learn what this means for you and how to stay protected.

This article was previously published under Q311884
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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
SYMPTOMS
If your computer is set to use the "(GMT-06:00)" time zone, the time on your computer may decrease by one hour when you start the Date and Time tool in Control Panel.
CAUSE
This problem can occur if your original time zone was set to "(GMT-06:00) Guadalajara, Mexico City, Monterrey." When you start the Date and Time tool in Control Panel, the time zone is reset to the "(GMT-07:00) Chihuahua, La Paz, Mazatlan" time zone, which is an hour earlier. If you do not change the time zone back to the original setting, you can reset the clock after you click OK.
RESOLUTION
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

To resolve this problem:
  1. Start Registry Editor (Regedit.exe).
  2. Locate and click the Dlt value under the following key in the registry:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\TimeZones\Mexico Standard Time 2
  3. On the Edit menu, click Modify, type Mexico Daylight Time 2, and then click OK.
  4. Locate and click the Std value under the following key in the registry:
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\TimeZones\Mexico Standard Time 2
  5. On the Edit menu, click Modify, type Mexico Standard Time 2, and then click OK.
  6. Quit Registry Editor.
STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.
Properties

Article ID: 311884 - Last Review: 02/27/2014 21:10:40 - Revision: 1.5

  • Microsoft Windows XP Home Edition
  • Microsoft Windows XP Professional
  • Microsoft Windows XP 64-Bit Edition
  • kbnosurvey kbarchive kbhotfixserver kbqfe kbenv kbprb KB311884
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