These updates apply to the following operating systems:
- Windows Server 2012 R2
- Windows 8.1
- Windows RT 8.1
- Windows Server 2012
- Windows Server 2008 R2 Service Pack 1 (SP1)
- Windows 7 SP1
- Windows Server 2008 Service Pack 2 (SP2)
Updates that have been issued
The following daylight saving time updates have been issued for Windows since 2010.
Note The cumulative updates are rollups of all previous changes. The latest cumulative update is the only one that is required. The old updates do not have to be explicitly installed.
Before you follow the procedures in this article, you must be aware of issues that may affect Microsoft Outlook. For more information, see the following Microsoft Knowledge Base article:
931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook
This article will be updated as new time zone changes are announced. Customers who want to update the time zone by using registry files must fully test the solution before they deploy it.
In many countries, the start dates and end dates for daylight saving time (DST) change from year to year. Additionally, countries may change their policy of how they recognize daylight saving time, or they may change the local time offset from Coordinated Universal Time (UTC).
This article contains information about how to update the registry in Microsoft Windows to accommodate these kinds of ongoing changes. All computers should be updated to include these time zone updates regardless of whether they are located in a changing time zone. This is because some applications may use the local time zone database to perform date and time calculations for events that occur elsewhere in the world.
Please install the time zone updates as soon as possible. This minimizes the number of delays that will be experienced by Outlook and Exchange meetings or calendar events that are scheduled during that period.
Latest DST update
For the latest daylight saving time update for Windows, see the following Microsoft Knowledge Base article:
DST help and support
The samples in this article update the global time zone rules that are used in Windows as of December 2011. For more information about how daylight saving time changes may affect other Microsoft products, go to the following Microsoft website: