Windows 2000 may start or end daylight saving time on an incorrect date and time if the time zone is set to (GMT+02:00) Cairo
For example, your computer's clock may change to daylight saving time on the first Friday of May at 02:00, and it may change from daylight saving time on the last Wednesday of September at 02:00. However, in Egypt, daylight saving time begins on the last Friday in April at midnight (00:00:00) and ends on the last Friday in September at midnight (00:00:00).
The behavior will only occur if the Date/Time Properties
settings are set to the following:
- Time Zone is set to (GMT+02:00) Cairo.
- The Automatically adjust clock for daylight saving changes check box is selected.
This problem occurs because information in the registry for this time zone is incorrect. The reference data is stored in the following subkey:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Egypt Standard Time
The currently in-use information is stored in the following subkey:
The time zone information in both of these locations is in binary format. Microsoft does not recommend that you resolve this problem by modifying the registry.
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next hotfix that contains this hotfix.
To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note
In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.The hotfix changes the registry settings to the following values:
- DST Start: Last Thursday of April at 11:59:59 PM
- DST End: Last Thursday of September at 11:59:59 PM
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
To set your computer to adjust for daylight saving time automatically, follow these steps:
- Click Start, point to Settings and then click Control Panel.
- Double-click Date/Time.
- On the Time Zone tab, do one of the following:
- To set your computer to change your system clock for daylight saving time, click to select the Automatically adjust clock for daylight saving changes check box.
- To set your computer to not change your system clock for daylight saving time, click to clear the Automatically adjust clock for daylight saving changes check box.
To work around this problem, you can manually change the time zone information, including the daylight saving time data, by using the TZedit.exe tool from the Windows 2000 Resource Kit.