As we get closer to the DST change here in the US, we have received some reports from a few customers that the system time erroneously reverted back an hour last Sunday (October 28). On these systems the customers did have KB931386 and / or KB933360 installed. What we have found from reviewing the data provided by these customers that the affected clients appeared to have some unexpected registry values, as shown in the keys below (the bold / red sections are the pertinent values)
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\StandardStart: 00,00,0a,00,05,00,02,00,00,00,00,00,00,00,00,00
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\TimeZoneInformation\DaylightStart: 00,00,04,00,01,00,02,00,00,00,00,00,00,00,00,00
In order to recover from this scenario, you can use either of the recovery methods below.
Method 1 - Use the “Date & Time” Control Panel Applet: Assuming that the user has the rights to modify the system clock, they can do the following.
- Using the “Date and Time” Control Panel applet, change the time zone of the client to one outside of the one they are in, then apply the change.
- Change back to the correct time zone, then apply the change and close the applet.
Method 2 - Use a single command-line statement OR the RefreshTZInfo.vbs script provided below: If the user does not have the rights to modify the system-clock, then either of the methods below can be used to push the refresh to multiple clients
First recovery option - single command-line statement: Add the following statement to a login script or batch file: control.exe timedate.cpl,,/Z Time Zone Name
For Example: control.exe timedate.cpl,,/Z Eastern Standard Time
Note that this method assumes you know the name of the time zone of the client that you will be running the command on. If you have clients in multiple time zones, see the second recovery option below.
Second recovery option - the RefreshTZInfo.vbs Script: Cut & paste the script below into notepad or another text editor, and name it RefreshTZInfo.vbs. Deploy this script via group policy or other deployment mechanism. See KB 914387 for more details about how to deploy this script. The script is also attached to this post as a text file.
Additional Resources:
- Preparing for DST Changes in 2007
- Daylight Saving Time Help and Support Center
- Daylight Saving Time Help and Support Center for IT Professionals
- MSDN - Visual Studio and Daylight Saving Time Change
- Download package for the TZEdit.exe Utility Package
DST, Windows, Troubleshooting, Knowledgebase
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