The update that is described in this article changes the time zone data to accommodate daylight saving time (DST) changes in several countries.
This is a cumulative update rollup that includes all previous Windows time zone changes. For more information about how DST changes may affect other Microsoft products, go to the following Microsoft website:
For more information about how DST changes may affect other Microsoft products, click the following article number to go to the article in the Microsoft Knowledge Base:
When you apply this update, you may receive a message that resembles the following:
This message indicates that either you have already applied the correct update or Windows Updates or Microsoft Update has automatically installed this update. No additional action is required to update the Windows operating system.