TechLifeBlogged

More Daylight savings infor from Microsoft this morning. Developers received an email stating that there could be an issue with their apps:

Developers who use the .NET Framework may find their applications affected if the application uses the time zone information for historical purposes or if they have derived custom classes from System.TimeZone to provide custom time zone information. The standard System.TimeZone class provides a managed wrapper for the underlying Windows Operating System time zone functions.
In addition, developers who use Visual C++ may find their applications affected if they use the CRT time functions, or the TZ environment variable. Microsoft is currently working on a fix for this issue and will post information about its availability on the Visual Studio Support page.
Most applications that use these affected classes will not need to be modified as this update will ensure that the correct data is provided seamlessly to the application. However, applications that use these classes or the underlying Windows API to perform historical time look-ups will need to be modified.

More: http://msdn2.microsoft.com/en-us/vstudio/bb264729.aspx, Preparing for daylight saving time changes in 2007, and KB928388: 2007 time zone update for Microsoft Windows operating systems.