This time zone will observe the following DST rules:. Clocks will be set forward from to on November 1, , and be set backward from to on Sunday, January 17, No DST change will be observed. Iran Standard Time Iran follows the Persian calendar. Montevideo Standard Time On June 30, , the Uruguayan government decided to abolish the observance of daylight saving time. This put the country into the UTC time zone all year round.
The following DST rules will be observed. Russia time zones: Russia announced that it would change its existing time zones on October 26, This change included seven updated time zones, three new time zones, and two existing time zones that merged into one.
Fiji Standard Time: Fiji announced that the country's new daylight saving time DST schedule would start on November 2, and end on January 18, During the time of Ramadan, DST will be interrupted and from July 20 to August 19, , time will be turned back to standard time.
The transitions reflecting the start and end of Ramadan are and can be installed via Fix it solutions provided in Microsoft Knowledge Base article. The history correction has also been included in CU As a result of Russia canceling DST and staying on permanent "summer time," the entire calendar was updated to summer time. This update changes the calendar to show winter time before March 27, while DST was still in effect. DST will start at A.
Kaliningrad Standard Time: As previously announced in Microsoft Knowledge Base article , Belarus has decided to discontinue daylight saving time from and stay on permanent "summer time. This windows update makes the move permanent by including Minsk in the display name for Kaliningrad standard time.
This time zone does not observe Daylight Saving. Prior to the August cumulative DST update, Microsoft released the following individual hotfixes in These are rolled up in the latest cumulative update and do not have to be explicitly installed.
This is a display name update only. These changes take effect starting in This is provided to address cases in which fix it solutions for temporary DST changes were only partially applied. Kamchatka Standard Time Removes the separate Kamchatka timezone. Kamchatka is now served by the Magadan timezone.
Introduces DST. Windows stores time zone information in two locations in the registry. The first location is the time zone database in the following registry subkey:. Windows and other applications use the data to calculate local times. The second location for time zone information is the following registry subkey:. Control sets in Windows store system configuration information such as drivers and services.
The TimeZoneInformation registry subkey in the current control set contains the configuration data for the time zone that Windows is currently using. Windows copies this information from the time zone database when the time zone is selected. When the time zone information is changed, both locations in the registry must be updated. The database must be updated to make sure that Windows and other applications have the most accurate time zone information available.
Additionally, the TimeZoneInformation registry subkey in the current control set must be reloaded to make sure that the time zone information is the same as the information that is in the time zone database. We recommend that you update the ti me zone database first. Then, reload the TimeZoneInformation registry key. This procedure forces Windows to read the updated information in the database.
The two methods that are explained in this article use this approach. This article provides the following methods to update the time zone database and to reload the TimeZoneInformation registry key to force Windows to read the updated information in the database. Method 1: Change the time zone setting on multiple networked computers. Method 2: Change the time zone setting on a single computer. Important Microsoft strongly recommends that you use Windows Update or that you download the time zone update from the Microsoft download site instead of manually editing the registry.
Manual edits of the registry are risky and are prone to errors. These alternative instructions for how to configure the registry are provided for legacy purposes only.
Before you make any changes to the time zone settings, export the registry subkeys that are used for Windows time zones. Then, you can restore the time zone registry subkeys to their original state if it is necessary. Click Start , click Run , type regedit , and then press Enter. Click Start , click Run , type notepad , and then press Enter. In the Files of type box, click All Files. Copy and paste the following line to the beginning of the file immediately after the line "Windows Registry Editor Version 5.
The import process then uses the rest of the file to re-create the registry subkey and to populate it with the default values. In the Save as type box, click All Files. Click OriginalTZDatabase. Click Start , click Run , type cmd , and then press Enter. Locate where you saved the OriginalTZDatabase. Copy and paste the following line to the beginning of the file immediately after the line Windows Registry Editor Version 5.
To change the time zone settings on multiple networked computers, create and then import a registry file that contains all the updated time zone registry changes. Then, use Group Policy or another distribution mechanism to deploy the registry file to the computer.
To do this, follow these steps. Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. To do this, first create a registry file. The method that you use to do this depends on whether you have English builds of Windows or non-English builds of Windows.
How to create a registry file for English builds of Windows Note The following time zone registry file is for use only on English builds of Windows. Several of the values in the registry subkeys have been localized. Therefore, these steps will work only on English builds of Windows. To use Registry Editor to create a registry file that contains the time zone updates for English builds of Windows, follow these steps:.
Click Start , click Run , type notepad , and then click OK. Select a destination, and then type TZupdate. In the Save as type box, click All Files , and then click Save. How to create a registry file for non-English builds of Windows Note The registry text that follows does not include information for new time zones, such as Venezuela Standard Time or Armenian Standard Time.
Some of the registry subkeys in each time zone are locale-specific. Therefore, we have not included them in this list. For instructions about how to use TZEdit. To use Registry Editor to create a registry file that contains the time zone updates for non-English builds of Windows, follow these steps:.
Use one client computer as a baseline for the registry file that you want to create or to export in your environment. On that client computer, click Start, click Run , type notepad, and then click OK. Windows Registry Editor Version 5. When you are prompted to merge the changes, click Yes to update the registry.
In the File name box, type TZUpdate. The registry must be updated in two locations. When you import the TZupdate. Next, you must create a script that updates th e TimeZoneInformation registry key in the current control set.
You can deploy this script by using Group Policy or another deployment mechanism. The script identifies the current time zone of the client computer and then reloads the TimeZoneInformation registry key with the updated information from the time zone database. Then, the script writes an event to the Application log of the client computer where the script was run. To create the script file, follow these steps.
Note Microsoft provides programming examples for illustration only, without warranty either expressed or implied.
This includes, but is not limited to, the implied warranties of merchantability or fitness for a particular purpose. This article assumes that you are familiar with the programming language that is being demonstrated and with the tools that are used to create and to debug procedures. Microsoft support engineers can help explain the functionality of a articular procedure. However, they will not modify these examples to provide added functionality or construct procedures to meet your specific requirements.
Select a destination, and then type refreshTZinfo. The following example demonstrates how to create a startup script, copy files to a common location in the domain, and then create a Group Policy object GPO.
This example uses an Active Directory deployment together with the sample domain name contoso. Quick access. Search related threads. Remove From My Forums. Asked by:. Archived Forums. Windows Server General Forum. Sign in to vote. Friday, April 25, AM. A subset of the region that shares a time zone makes a change to its DST requirements or changes the time bias of its time zone. A new time zone is required for the affected users within that region because the existing time zone has to remain unchanged for the rest of the users.
Microsoft will introduce a new time zone for such scenarios. A new Windows time zone entry will be created only when a country or region including dependencies , or a first-order administrative division of a country or region state, province, department, and so on , has a separate and distinct history of UTC offsets and DST rules from existing TZ entries.
Additionally, a smaller geographic area county, city, and so on qualifies for a new Windows time zone entry when its current UTC offset and DST rule combination is not provided by another Windows time zone entry.
If there is insufficient lead time to engineer, test, and publish a Windows Update before these changes take effect, Microsoft will publish interim guidance on the DST Blog that can be used up until a Windows Update is made available. In order to make sure that these updates are made available before these laws take effect, we recommend that governments provide ample notice 1 year or more prior to the change taking effect.
A region that has an existing Windows time zone announces changes to the name referenced in the Windows time zone display name. Microsoft will update the display name for the existing time zones for all supported languages and publish an update.
If there is insufficient lead time to engineer, test and publish a Windows Update before these changes take effect, Microsoft recommends using the existing time zone until a Windows Update is made available.
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