WOJTEK

http://technet.microsoft.com/en-au/bb978329.aspx

WSS maintains time zone information independently of the host operating system in the text file TIMEZONE.XML.  Traditionally, hotfixes were used to update TIMEZONE.XML, but in November 2007 it was decided that this was not the most efficient way to make these changes, and development of an alternative mechanism was started.  Until this work is completed (the estimate is early in 2008), TIMEZONE.XML will need to be updated manually.

To prepare WSS for a daylight saving change, the following steps need to be performed:

1. Apply the latest cumulative time zone updates to the host Windows Server operating system.
2. Apply the latest hotfix or service pack to WSS to rectify known daylight saving issues and obtain the most recent version of TIMEZONE.XML.
3. Update TIMEZONE.XML to reflect the changes in daylight saving time. 
4. Use the SharePoint TZMOVE function to adjust any time-dependent data items that fall between the old and new daylight saving times.

ben Sharepoint, Windows Microsoft, Sharepoint