Daylight Saving Time Help and Support Center

Help and support on how to update your Windows computer for Daylight Savings Time (DST).

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What is Daylight Savings Time (DST)?


Daylight saving time (DST), and "Summer Time" in much of Europe, is the practice of moving local time forward one hour in the spring and backwards in the autumn. These spring and autumnal shifts to DST are different between northern and southern hemispheres. The start of DST in the northern hemisphere is usually in March or April (depending on the country/continent), and ending in October or November. In the southern hemisphere, the changes are the opposite, with DST beginning in October and ending in March or April.

What does this mean for me?


It is important that the time zone settings for your computer's system clock and your calendar programs are updated. For your home PCs the most important action you can take is to ensure you are using Windows Update. Choosing to automatically update your operating system via Windows Update will give you a seamless transition to the new Daylight Savings Time and Time Zone settings. Guidance on how to update computers and installed Microsoft products is available here.

DST Hot Topics & Latest News

Subscribe to the Microsoft Daylight Savings Time & Time Zone Blog to receive the latest updates on DST changes

Notice: Fiji DST Change for 2014
24-Oct-14

Notice: Update for Russian Time Zone Changes is Now Available
23-Sep-14

Announcement: Update for Russian Time Zone Changes
22-Aug-14

Notice: August 2014 DST Cumulative Update for Windows Operating Systems is available
12-Aug-14

Notice: Updates are available for Egypt DST Ramadan Exception in 2014
24-July-14

Notice: Updates are available for Morocco DST Ramadan Exception in 2014
24-July-14

Notice: Updates available for Paraguay, Turkey and Chile time zones
17-Mar-14

Notice: Update available for Brazil, Fiji and Jordan time zones
25-Feb-14

Notice: December 2013 DST Cumulative Update for Windows Operating Systems
9-Dec-13

Notice: August 2013 DST Cumulative Update for Windows operating systems released
13-Aug-13

Notice: Paraguay Shortens 2012-2013 DST
20-Mar-13

Notice: Hotfix available for Chile 2013 DST Extension
7-Mar-13

Notice: December 2012 DST Cumulative Update is available for Windows operating systems
11-Dec-12

Notice: October 2012 DST Cumulative Update is available for Windows operating systems
11-Oct-12

Notice: 2012 Ramadan DST change for Morocco
5-July-12

Notice: 2012 DST Changes for Morocco
24-April-12

Notice: Armenia Cancels DST
23-Mar-12

Notice: Hotfix available for Chile DST change
8-Mar-12

Notice: December 2011 DST Cumulative Update is available for Windows operating systems
29-Nov-11

Notice: Ukraine and Armenia revert 2011 DST cancellation
19-Oct-11

Notice: DST Guidance for Office 365 customers made available
14-Oct-11

Advisory Notice: DST Cancellation planned for Armenia, Belarus and Ukraine
6-Oct-11

Notice: Daylight Savings Time updates for Exchange Server 2007 SP3 Available in Update Rollup 5
27-Sep-11

Announcement: Microsoft webcast on daylight saving time changes in Russia available on demand
20-Sep-11

Notice: Daylight Savings Time updates for Commerce Server 2009 and 2007 Available
19-Sep-11

Notice: Daylight Savings Time updates for SharePoint 2010 and SharePoint 2007 Available
14-Sep-11

Notice: August 2011 DST Cumulative Update is available for Windows operating systems
16-Aug-11

Notice: A hotfix is available to update Windows DST support for Egypt, Chile and Morocco
3-May-11

Notice : DST schedule updated again for Chile
31-Mar-11

Notice: a hotfix is available to update Windows DST support for (UTC +2:00) Istanbul
25-Mar-11

Notice: a hotfix is available to update Windows DST support for (UTC -4:00) Santiago
25-Mar-11

Notice : A hotfix is available to update Windows DST support for (UTC +12:00) Fiji, and (UTC -11:00) Samoa
25-Mar-11

December 2010 DST Cumulative Update for Windows operating systems
2-Dec-10

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How do I update my computer?

Home Computers

  • The most important action you can take is to ensure you are using Windows Update. Choosing to automatically update your operating system via Windows Update will give you a seamless transition to the new Daylight Savings Time settings.
  • In some cases calendar based applications may also need to be updated. Guidance and details on how to update your Microsoft Calendar products is available here.
  • For guidance on how to update products from software vendors other that Microsoft you should refer to the software vendor's website.

Workplace Computers

  • If your workplace has an IT Department contact your IT Administrator.
  • Follow the Home Computers guidance.

IT Professional

Small or Medium Business

  • If you have a consultant who managers your systems then Contact them to discuss the required updates for your computers, applications and network.
  • If you manage your own systems then refer to the IT Professional guidance.

Partners

If you are a Partner updating your own systems or assisting customers to update their systems partners should refer to the IT Professional guidance. Further support for Microsoft Partners is available through the following:

Developers

To update your code for Daylight Saving Time, visit MSDN: Visual Studio and Daylight Saving Time Change to find the correct information.

Updating Exchange and Outlook Calendars

Recommended sequence of DST update actions for Windows, Exchange and Outlook

Calendar environments have an interconnected system of applications, and each environment must be adjusted to accommodate the new DST rules. Please note that KB articles may be superseded. Please review the documentation carefully before you apply any updates.

There are many supported combinations of Exchange Servers and Outlook Clients. The approach that customers should take to update their calendaring environments is dependent on these combinations. The following table shows the high level requirements for rebasing Exchange/Outlook calendars for each of these combinations.
It is important that customers follow the guidance for each specific version of Outlook that exists in their environment. e.g. If you have an Exchange Server 2010 on premise infrastructure and both Outlook 2007 and Outlook 2010 clients, the Time Zone Data Update Tool for Microsoft Outlook must be run on all Outlook 2007 clients. Outlook 2010 clients do not require that the tool be run.

All the guidance on this page should be reviewed in order to understand the appropriate sequence of actions customers should take, including the updates that should be applied prior to rebasing calendars.

 
 Outlook Client Versions
Customer EnvironmentOutlook 2007Outlook 2010Outlook 2013
Exchange Server 2007Exchange Calendar Tool
or
Time Zone Data Update Tool for Microsoft Office Outlook
No Action RequiredNo Action Required
Exchange Server 2010Exchange Calendar Tool
or
Time Zone Data Update Tool for Microsoft Office Outlook
No Action RequiredNo Action Required
Exchange Server 2013 / Office 365 / Exchange OnlineTime Zone Data Update Tool for Microsoft Office OutlookNo Action RequiredNo Action Required
  1. Apply updates to Windows operating systems on individual computers.
  2. Run the Outlook Time Zone Data Update Tool. It is important to run the tool as soon as possible after you apply the updates to help ensure consistent application of DST rules.
  1. Apply updates to Windows operating systems on individual workstations.
  2. Apply updates to Windows operating systems on Windows Servers.
  3. For Exchange Server 2007, apply DST Update (See the Available DST and TZ Updates for Microsoft Products and Services page for details)
  4. For Exchange Server 2007, run the Exchange Calendar Update Tool against all Exchange 2007 Servers, or correct all individual Outlook calendars (Outlook 2007) using the Outlook Time Zone Data Update Tool.
  5. The IT administrator has one of four alternatives with regardsto running the calendar update tools for Exchange and Outlook (pros and cons of each alternative are described later in this article):
    • Push out the Outlook Time Zone Data Update Tool to the clients and let the users update their own mailboxes.
    • Run the Exchange Calendar Update Tool against all affected users, servers, or both.
    • Do not run the Exchange Calendar Update Tool or the Outlook Time Zone Data Update Tool. Ask users to examine their calendars and rebook as necessary.
    • Run the Exchange Calendar Update tool against all affected users, servers, or both, but only modify recurring appointments. Then ask users to rebook single instance appointments that fall into the extended DST period or ask them to run the Outlook Time Zone Data Update Tool.
  6. IT administrators should fully understand and analyze the implications of the four alternatives for deploying the Outlook or the Exchange version of the tool. The respective pros and cons of each scenario are described in the Implications of the 4 different approaches to updating Calendars section below. For more information, please refer to Microsoft Knowledge Base articles 931667 and 941018.
  7. In a scenario where there are only Outlook 2010 clients, you might experience meetings that are re-based correctly by simply installing the Windows DST update. The availability information for a meeting is calculated by the Exchange Server, thus if the Exchange Server is not updated to SP1RU6 (or SP3RU5 ) along with the Windows DST update, the availability information might be mismatched to the Outlook calendar information, which would be correctly updated. This can result in the recipients reporting mismatched calendar items which are not really mismatched, but they have mismatched availability information.

The following items should be noted to help ensure maximum accuracy of calendar updates:

  1. Rapid succession of steps is important
    As mentioned earlier, it is better to run the Outlook or Exchange Time Zone Date Update Tool as soon as possible after the time that the Windows operating system time zone updates and Exchange Server updates are applied to all computers and servers. If calendar items in the extended DST period are scheduled after the operating system updates are applied but before the tool is run, they will incorrectly be moved one hour earlier. To correct such calendar items, organizers should manually update such items to help make sure that they are scheduled accurately for themselves and all invitees.
  2. All connected devices must be updated
    Even if you correctly update your computer, when you view your calendar from a non-updated mobile device running Windows Mobile, your calendar items during the extended DST period will be shifted by one hour. Items created on a Windows Mobile device that does not have the update applied must be updated on your computer by running the Outlook Time Zone Data Update Tool again.
  3. If other users have not updated their calendars, it will affect other users
    The Outlook Time Zone Data Update Tool only updates meetings for which the user is the organizer and then automatically sends updates for those meetings to attendees. So, meetings that you are invited to but did not organize will not be updated until the organizer updates the meeting and an update is sent to you through Outlook. You must accept these updates in Outlook to correct your calendar on these meetings. Additionally, meetings created by a delegate on your behalf from a computer that does not have the update installed must be updated on your computer by running the Outlook Time Zone Data Update Tool again.
  4. Users have the option to accept the change
    The tool will prompt meeting invitees about whether to change meeting times. The invitees must accept the updated meeting requests for the changes to be accurately reflected in their calendars. If the tool incorrectly prompts a user to move a meeting, the user has the option of un-selecting those meetings from the list and they will not be moved.
  5. Special considerations for recurring calendar items
    Recurring calendar items created by Outlook Web Access will not be updated correctly if the Exchange Server computer is updated before the desktop client that is running the update tool (applies to both Outlook and Exchange tools). Users who create recurring calendar items must be aware of this and carefully review their calendar after the update is complete, regardless of which sequence of steps were followed in their Exchange environment.
  6. Update resource mailbox calendars
    Follow the procedures listed here to correctly update calendars in resource mailboxes.

The IT administrator has one of four alternatives (pros and cons of each alternative are described later in this article):

  • Push out the Outlook Time Zone Data Update Tool to the clients and let the users update their own mailboxes.
  • Run the Exchange Calendar Update tool against all affected users, servers, or both.
  • Do not run the Exchange Calendar Update Tool or the Outlook Time Zone Data Update Tool. Ask users to examine their calendars and rebook as necessary.
  • Run the Exchange Calendar Update tool against all affected users, servers, or both, but only modify recurring appointments. Then ask users to rebook single instance appointments that fall into the extended DST period or ask them to run the Outlook Time Zone Data Update Tool.
  • IT administrators should fully understand and analyze the implications of the four alternatives for deploying the Outlook or the Exchange version of the tool. The respective pros and cons of each scenario are described below. For more information, please refer to Microsoft Knowledge Base articles 931667 and 941018.
  1. Run the Exchange Time Zone Date Update Tool against all Exchange Servers.
    • Pros: Streamlined experience for users.
    • Cons: Potential risks to IT environment of running Exchange Time Zone Update Tool. More likely to incorrectly modify single-instance appointments.
  2. Push out the Outlook Time Zone Data Update Tool to the clients and let the users update their own mailboxes.

    • Pros: Less likely to incorrectly modify single-instance appointments. Avoid potential risks to IT environment of running the Exchange Time Zone Update Tool.
    • Cons: Difficult to make sure that all users run this tool correctly and in a timely manner. Educational effort is needed to lessen confusion for users.
  3. Run the Exchange Time Zone Date Update Tool against all Exchange Servers but only modify recurring appointments. Then ask users to rebook single instance appointments that fall into the affected period or ask them to run the Outlook Time Zone Data Update Tool.

    • Pros: Less likely to incorrectly modify single-instance appointments.
    • Cons: Potential risks of both the Exchange and Outlook Time Zone Update Tools; all users will have to run the tool and risks of running the Exchange Time Zone Date Update Tool still exist.
  4. Do not run the Exchange Time Zone Update Tool or the Outlook Time Zone Update Tool. Ask users to examine their calendars and rebook as necessary.

    • Pros: Same as alternative #1-less likely to incorrectly modify single-instance appointments. Avoid potential risks to IT environment of running the Exchange Time Zone Update Tool.
    • Cons: Unless all users rebook all appointments, some calendar items will be one hour off in extended DST period.
  5. If the steps above are not followed correctly, the following actions apply

    • If Outlook Time Zone Data Update Tool is run before Windows operating systems updates are applied to all computers
      If you run the Outlook Time Zone Data Update Tool before the system has the Windows operating system update, the tool will not list any calendar items to update because it will not yet recognize the new DST rules.
    • If the Outlook Time Zone Data Update Tool is run multiple times
      Generally, it is safe to run the tool multiple times because the tool will see all the appointments that were updated and ignore them. That said, if the user explicitly instructs the tool to ignore a set of appointments (for example, single instance appointments that are targeted at a different time zone or that the user created after updating time zone rules but before they run the time zone update tool) then the tool will continue to list those appointments in future runs and the user will have to explicitly ignore those appointments again. Similarly, it is safe to run the Outlook Time Zone Data Update Tool after the Exchange Time Zone Date Update Tool has been run.

Available DST and TZ Updates for Microsoft Products

List of products and services affected by daylight saving time


 
Product Family Details Available
Windows Server Windows Server 2008 R2
Windows Server 2008
Windows Server 2003

Windows Client Windows 7
Windows Vista SP2
Windows XP SP3
Windows Azure Windows Azure
SQL Azure SQL Azure
Exchange Server Exchange Server 2010
Exchange Server 2007 SP3
Outlook
Outlook 2010
Outlook 2007 SP2
Office 365
Office 365
Commerce Server Commerce Server 2007 and 2009
Windows SharePoint Services O365 SharePoint Online
Windows SharePoint 2010
Windows SharePoint Services 3.0 SP2
SQL Server Notification Services SQL Server 2005 Notification Services
SQL Server 2000 Notification Services
Groove Office Groove 2007
Dynamics CRM Dynamics CRM 2011
Dynamics CRM 4.0
Dynamics CRM 3.0
Windows Mobile and Windows PhoneWindows Mobile 6.x
Windows Phone 7
Windows Phone 8
Windows CE Windows CE-based devices
Outlook for MAC Outlook 2011 for MAC
Windows Services For Unix (SFU) and
Subsystem for UNIX-based Applications (SUA)
Windows Services For Unix (SFU) 3.5
Windows Services For Unix (SFU) 3.0
SUA in Windows Server 2003 R2
SUA in Windows Vista

Detailed update information and downloads

Windows Server and Client

Windows 8.1, Windows 8, Windows 7, Windows Server 2012 R2, Windows Server 2012, Windows Server 2008 R2, Windows Server 2008, Windows Vista SP2, Windows Server2003 SP2, Windows XP SP3

  • Ensure you have applied the latest updates to Windows
  • For the latest DST updates for all supported versions of Windows refer to KB 914387, how to configure daylight saving time for Microsoft Windows operating systems.

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Windows Azure

  • It is important to note that while Microsoft’s Services infrastructure will be updated to reflect DST changes it is critical that customer computers, both Client and server, that interact with these services should have the latest Windows cumulative updates for DST updates applied in order to ensure data integrity.

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SQL Azure

  • It is important to note that while Microsoft’s Services infrastructure will be updated to reflect DST changes it is critical that customer computers, both Client and server, that interact with these services should have the latest Windows cumulative updates for DST updates applied in order to ensure data integrity.

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Exchange Server

Exchange Server 2013 / Exchange Server Online

  • Ensure you have the latest updates for Exchange Server 2013, install the Windows cumulative update or Hotfix
  • Information on latest updates for Exchange Server can be found on the Exchange Team blog.

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Exchange Server 2010 Service Pack 3

  • Ensure you have the latest updates and Service Pack for Exchange Server 2010, install the Windows cumulative update or Hotfix
  • Information on latest updates for Exchange Server can be found on the Exchange Team blog.
  • You should then refer to the Updating Exchange and Outlook Calendars to check if further action is required.

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Exchange Server 2007 Service Pack 3

  • An update will be made available. Please check back here for further information soon.
  • Ensure you have the latest updates and Service Pack for Exchange Server 2007, install the Windows cumulative update or Hotfix.
  • Information on latest updates for Exchange Server can be found on the Exchange Team blog.
  • Refer to the Updating Exchange and Outlook Calendars page to check if further action is required.

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Outlook

Outlook 2013

  • Ensure you have applied the latest Office Updates and Windows Updates.
  • Information on latest updates for Exchange Server can be found on the Outlook blog.

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Outlook 2010

  • In Outlook, you can display two separate time zones in the Calendar. This allows you to see your local time zone and the time zone of a city that you often travel to. When you travel to that other time zone, you can use the Swap Time Zones option to change the position of the time bar in the Calendar. Using the Swap Time Zones option in Outlook 2010 results in unexpected behavior. This issue is fixed in Outlook 2010 SP1 and Microsoft recommends that customers download and install this service pack to avoid this problem. Customer who have not yet installed Outlook 2010 SP1 can find a work around for this issue in Outlook 2010 in the KB Article 2507003 Using Outlook 2010 Swap Time Zones to switch from non-DST to DST Time Zone does not enable DST in Windows.

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Outlook 2007 Service Pack 2

  • KB 931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook

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Office 365

  • Ensure you have applied the latest Office Updates and Windows Updates.
  • Information on latest updates for Exchange Server can be found on the Outlook blog.

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Windows SharePoint Services

Office 365 SharePoint Online

Information will be made available soon.

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Windows SharePoint 2010

  • KB 2553050 Description of the SharePoint Foundation 2010 cumulative update package (SharePoint Foundation server-package): August 30, 2011

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Windows SharePoint Services 3.0 Service Pack 2

  • KB 888253 How to manually update the DST period for a time zone definition in Windows SharePoint Services by modifying the Timezone.xml file
  • KB 2553019 Description of the Windows SharePoint Services 3.0 hotfix package (Sts-x-none.msp): August 30, 2011

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Commerce Server

Commerce Server 2007 and 2009

  • KB 932395 How to update Commerce Server 2007 and Commerce Server 2009 for changes to daylight saving time
  • Customer computers, both Client and server, that interact with these services should have the latest Windows cumulative updates for DST updates applied in order to ensure data integrity.

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SQL Server Notification Services

SQL Server 2005 Notification Services

  • KB 974412 DST time zone update for SQL Server 2005 Notification Services and for SQL Server 2000 Notification Services

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SQL Server 2000 Notification Services

  • KB 974412 DST time zone update for SQL Server 2005 Notification Services and for SQL Server 2000 Notification Services

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Groove

Important information for users who have Groove workspaces: After this change, users should communicate to verify and adjust start times and end times of Groove Meetings tool meetings and Groove Calendar tool appointments. Also, users should be aware that time stamps may appear incorrectly in other Groove tools such as Discussion, Forms, Chat, and messaging. For more guidance on resolving or working around these problems, refer to the DST KB articles listed below for your specific version of Groove.

Office Groove 2007

  • KB 932607 How to correct issues that are caused by daylight saving time changes in 2007 and that affect the Calendar tool in Groove 2007 and in earlier versions of Groove

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Microsoft Dynamics CRM

Dynamics CRM 2013 Online

  • It is important to note that while Microsoft’s Services infrastructure will be updated to reflect DST changes it is critical that customer computers, both Client and server, that interact with these services should have the latest Windows cumulative updates for DST updates applied in order to ensure data integrity.

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Dynamics CRM 2013

  • KB 2917899 Microsoft Dynamics CRM 2013 updates and hotfixes

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Dynamics CRM 2011

  • KB 2555051 Microsoft Dynamics CRM 2011 updates and hotfixes

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Dynamics CRM 4.0

  • KB 949256 Microsoft Dynamics CRM 4.0 updates and hotfixes

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Dynamics CRM 3.0

  • KB 908951 Microsoft Dynamics CRM 3.0 updates and hotfixes

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Windows Mobile and Windows Phone

Windows Mobile 6.x

  • For information about updating Windows Mobile 6.x refer to KB 2526756

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Windows Phone 7

  • All Windows Phone 7 updates are published by Microsoft and notifications are sent to your phone when they are available. Installing these updates will ensure you have the latest changes for DST.To manually set the time, tap Settings> Date+time.

Windows Phone 8

  • All Windows Phone 8 updates are published by Microsoft and notifications are sent to your phone when they are available. Installing these updates will ensure you have the latest changes for DST. To manually set the time, tap Settings> Date+time.

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Windows CE

Windows CE-based devices

All updates for Windows CE are available from the Windows Embedded Download Site

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Outlook for Mac

Outlook for Mac 2011

To ensure you have the latest updates for Daylight Savings Time and Time Zone changes you can do one of the following:

  • An update will be made available. Please check back here for updates.
  • Select Check for updates in the Office for Mac 2011 Help menu. This will automatically search for the latest available updates.
  • Visit the Download Page on the Office for Mac website to find the latest available updates

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Windows Services For Unix (SFU) and Subsystem for UNIX-based Applications (SUA)

Windows Services For Unix (SFU) 3.5, Windows Services For Unix (SFU) 3.0, SUA in Windows Server 2003 R2, and SUA in Windows Vista

Information will be made available soon.

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Microsoft Policy in Response to DST/TZ Requests

Microsoft Windows has established an annual update schedule for daylight saving time (DST) and time zone (TZ) releases. Most Windows-based applications (and some services) reference the underlying operating system for DST/TZ information, but some applications and services do not. Hence many of our product teams also follow an annual product update cadence such a Windows, with provisions for semi-annual cumulative updates as needed. For each update release, Microsoft accepts change requests up to a few months (generally four to six) prior to the release date. The Windows Release schedule provides a regular cadence for other product groups to follow.

Following the Windows regular cadence for publishing newly legislated DST rules and TZ updates, cumulative DST and Time Zone updates are scheduled for release each December (to the Microsoft Download Center and to Windows Update) for the coming calendar year as long as there are time zones affected. When needed, Microsoft product groups may also provide a semi-annual update in the August/September timeframe. The product group will also publish the new or modified TimeZoneInformation (TZI) keys in an update to Microsoft KB article 914387 for IT professionals and systems administrators who may need that information. Microsoft hopes that this will provide a more predictable way for customers to anticipate and plan for our scheduled product updates as they are published.

Recommendations

In order to achieve more seamless transitions to new DST and time zone policies, Microsoft requests that governments provide the following:

  1. Ample advance notice (1 year or more) of the planned change.
  2. Official published confirmation of planned changes to DST or time zones.
  3. Concentrated efforts on promoting the change to the affected citizens.

Customer requests and the Microsoft DST/TZ Support Policy

 
Change TypeChange DetailsSolution RecommendationsSolution
Change to a region's TZ rulesNew DST or TZ change matches another TZs exact parameters.There will be no product updates for this type of request. The recommendation is for the country or region requesting this change to use the existing time zone that matches the same parametersGuidance
Changes to existing time zones

Modifying the DST start and end times and dates of a time zone (or several time zones that affect a particular country or region) with no time zone that matches the exact parameters.

-or-

Modify an existing time zone by change the DST rule or adding and removing DST to a time zone.

-or-

Modifying the time bias to an existing time zone.

In this scenario, if there is no existing time zone that matches the exact requirements of the country or region, the recommendation is to schedule the request to be included in the next DST/TZ cadence release.

Microsoft’s ability to meet any country or region’s needs with this official DST/TZ policy, depends greatly on the regions providing sufficient time (6 months or more) of notification prior to the change taking effect.

Cadence Update

-and-

Guidance

New Time ZonesA 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 subset of users changing requirements because the existing time zone is needed as is for the rest of its users.

This scenario requires a new time zone. The recommendation is to schedule the request to be included in the next DST/TZ cadence release.

Microsoft’s ability to meet any country or region’s needs with this official DST/TZ policy , depends greatly on the regions providing sufficient time (6 months or more) of notification prior to the change taking effect.

Cadence Update

-and-

Guidance

On occasion, when there are extreme circumstances that require a change to a time zone, Microsoft may make an effort to provide a solution to the customers in the impacted regions through an Out-of-Band (OOB) Release. Any such package may include a Windows hot fix and a documented Outlook solution through the TZMOVE tool. Where a temporary workaround for customers exists Microsoft may recommend using the workaround until the Cadence Release is made available.

Other resources

DST Webcasts

When DST and Timezone changes occur Microsoft often produces webcasts to support customers. These webcasts include the guidance provided on this site and the Q&A sessions with customers. The DST Webcasts page will continue to be updated as new webcasts are available.

Microsoft IT deployment guidance


The following guidance documents from the Microsoft IT Department cover a wide range of enterprise scenarios for DST change management. Guidance from both 2011 and 2007 is available all of which remains highly relevant to the broad range of customers and partners using different versions of Microsoft Products in their environments.



MSIT 2011 Guidance
The following documents provide information about Microsoft’s approach to rolling out the DST changes for Russia across the Microsoft enterprise.

XPS format:
To view these documents on computers that do not have Vista or Internet Explorer 7 installed, visit the following Web site to download and install the free XPS viewer: http://www.microsoft.com/whdc/xps/viewxps.mspx

MSIT DST Assessment Checklist
MSIT Enterprise Response Plan
MSIT Russia DST Awareness Communication

PDF format:
To view these documents on computers that do not have the Adobe reader software installed, visit the following Web site to download and install the free PDF viewer: http://www.adobe.com/products/acrobat/readstep2.html

MSIT DST Assessment Checklist
MSIT Enterprise Response Plan
MSIT Russia DST Awareness Communication

MSIT 2007 Guidance
The following links provide information that Microsoft learned in deploying daylight saving time changes in the enterprise during the 2007 DST changes in the United States. This information may help your organization in preparing for changes.

XPS format:
To view these documents on computers that do not have Vista or Internet Explorer 7 installed, visit the following Web site to download and install the free XPS viewer: http://www.microsoft.com/whdc/xps/viewxps.mspx

MSIT DST Assessment Checklist
MSIT DST Enterprise Response Plan
MSIT DST Patching Overview
MSIT DST Exchange TZ Update Tool Guidance
MSIT DST Outlook TZ Update Package Guidance
MSIT DST Exchange Calendar Update Tool Awareness Communication
MSIT DST Outlook Time Zone Data Update Tool Awareness Communication
MSIT DST Windows Mobile Smartphone or Pocket PC user Awareness Communication

PDF format:
To view these documents on computers that do not have the Adobe reader software installed, visit the following Web site to download and install the free PDF viewer: http://www.adobe.com/products/acrobat/readstep2.html

MSIT DST Assessment Checklist
MSIT DST Enterprise Response Plan
MSIT DST Patching Overview
MSIT DST Exchange TZ Update Tool Guidance
MSIT DST Outlook TZ Update Package Guidance
MSIT DST Exchange Calendar Update Tool Awareness Communication
MSIT DST Outlook Time Zone Data Update Tool Awareness Communication
Updating resource mailboxes for daylight saving time 2007

DST Blogs

There are a number of useful blogs to keep customers up to date on DST\TZ changes in their region.

3rd Party Product updates

Blackberry/RIM
The latest available updates for BlackBerry can be found by searching the BlackBerry Knowledge Base
http://btsc.webapps.blackberry.com/btsc/microsites/microsite.do
Enter the Search term “daylight savings time” and Sort By: Publication Date to find the latest information.

Archived 2011 content and resources

Archived List of products and services affected by daylight saving time


 
Product Family Update Available
Windows Server Windows Server 2008 R2
Windows Server 2008
Windows Server 2003

Windows Client Windows 7
Windows Vista SP2
Windows XP SP3
Exchange Server Exchange Server 2010 SP1
Exchange Server 2007 SP3
Exchange Server 2003 SP2
Exchange Server 2003 MAPI CDO 1.2.1 and CDO 1.2.1
Exchange Server 2003 Lotus Notes Connector
Exchange 2000 Conferencing Server
Outlook
Outlook 2010
Outlook 2007 SP2
Outlook 2003 SP3
Office 365
Office 365
Commerce Server Commerce Server 2007 and 2009
Windows SharePoint Services O365 SharePoint Online
Windows SharePoint 2010
Windows SharePoint Services 3.0 SP2
SQL Server Notification Services SQL Server 2005 Notification Services
SQL Server 2000 Notification Services
Groove Office Groove 2007
Dynamics CRM Dynamics CRM 2011
Dynamics CRM 4.0
Dynamics CRM 3.0
Windows Mobile and Windows PhoneWindows Mobile 6.x
Windows Phone 7
Windows Phone 8
Windows CE Windows CE-based devices
Entourage Entourage
Outlook for MAC

Windows Services For Unix (SFU) and
Subsystem for UNIX-based Applications (SUA)
Windows Services For Unix (SFU) 3.5
Windows Services For Unix (SFU) 3.0
SUA in Windows Server 2003 R2
SUA in Windows Vista

Detailed update information and downloads

Windows Server and Client

Windows 7, Windows Server 2008 R2, Windows Server 2008, Windows Vista SP2, Windows Server2003 SP2, Windows XP SP3

  • For the latest DST updates for all supported versions of Windows refer to KB 914387 How to configure daylight saving time for Microsoft Windows operating systems.

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Exchange Server

Exchange Server 2010 Service Pack 1

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Exchange Server 2007 Service Pack 3

  • Ensure you have the latest Service Pack for Exchange Server 2007, install the Windows cumulative update or Hotfix and then install the Exchange 2007 DST Update. You should then refer to the Updating Exchange and Outlook Calendars page describing how to update Exchange Server 2003 in response to a DST change.
  • The Exchange 2007 SP3 DST Update for August 2011 has been released as a part of Rollup 5. See KB 2602324 Description of Update Rollup 5 for Exchange Server 2007 Service Pack 3 for more information.

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Exchange Server 2003 Service Pack 2

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Exchange Server 2003 MAPI CDO 1.2.1 and CDO 1.2.1

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Exchange Server 2003 Lotus Notes Connector

  • KB 978385 December 2009 cumulative DST update for Exchange Server 2003 Connector for Lotus Notes, Exchange Server 2003 Calendar Connector for Lotus Notes, and Exchange Server 2003 Migration Wizard for Lotus Notes

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Exchange 2000 Conferencing Server

  • KB 932658 Information about the changes to daylight saving time in 2007 for Exchange 2000 Conferencing Server
  • If you are working with a Technical Account Manager (TAM), contact your TAM about creating a hotfix request for Exchange SE to obtain the patch.

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Outlook

Outlook 2010

  • In Outlook, you can display two separate time zones in the Calendar. This allows you to see your local time zone and the time zone of a city that you often travel to. When you travel to that other time zone, you can use the Swap Time Zones option to change the position of the time bar in the Calendar. Using the Swap Time Zones option in Outlook 2010 results in unexpected behavior. This issue is fixed in Outlook 2010 SP1 and Microsoft recommends that customers download and install this service pack to avoid this problem. Customer who have not yet installed Outlook 2010 SP1 can find a work around for this issue in Outlook 2010 in the KB Article 2507003 Using Outlook 2010 Swap Time Zones to switch from non-DST to DST Time Zone does not enable DST in Windows.

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Outlook 2007 Service Pack 2

  • KB 931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook

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Outlook 2003 Service Pack 3

  • KB 931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook

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Office 365

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Windows SharePoint Services

Office 365 SharePoint Online

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Windows SharePoint 2010

  • KB 2553050 Description of the SharePoint Foundation 2010 cumulative update package (SharePoint Foundation server-package): August 30, 2011

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Windows SharePoint Services 3.0 Service Pack 2

  • KB 888253 How to manually update the DST period for a time zone definition in Windows SharePoint Services by modifying the Timezone.xml file
  • KB 2553019 Description of the Windows SharePoint Services 3.0 hotfix package (Sts-x-none.msp): August 30, 2011

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Commerce Server

Commerce Server 2007 and 2009

  • KB 932395 How to update Commerce Server 2007 and Commerce Server 2009 for the changes to daylight saving time

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SQL Server Notification Services

SQL Server 2005 Notification Services

  • KB 974412 DST time zone update for SQL Server 2005 Notification Services and for SQL Server 2000 Notification Services

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SQL Server 2000 Notification Services

  • KB 974412 DST time zone update for SQL Server 2005 Notification Services and for SQL Server 2000 Notification Services

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Groove

Important information for users who have Groove workspaces: After this change, users should communicate to verify and adjust start times and end times of Groove Meetings tool meetings and Groove Calendar tool appointments. Also, users should be aware that time stamps may appear incorrectly in other Groove tools such as Discussion, Forms, Chat, and messaging. For more guidance on resolving or working around these problems, refer to the DST KB articles listed below for your specific version of Groove.

Office Groove 2007

  • KB 932607 How to correct issues that are caused by daylight saving time changes in 2007 and that affect the Calendar tool in Groove 2007 and in earlier versions of Groove

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Microsoft Dynamics CRM

Dynamics CRM 2011

  • KB 2555051 Microsoft Dynamics CRM 2011 updates and hotfixes

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Dynamics CRM 4.0

  • KB 949256 Microsoft Dynamics CRM 4.0 updates and hotfixes

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Dynamics CRM 3.0

  • KB 908951 Microsoft Dynamics CRM 3.0 updates and hotfixes

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Windows Mobile and Windows Phone

Windows Mobile 6.x

  • For information about updating Windows Mobile 6.x refer to KB 2526756

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Windows Phone 7

  • All Windows Phone 7 updates are published by Microsoft and notifications are sent to your phone when they are available. Installing these updates will ensure you have the latest changes for DST.To manually set the time, tap Settings> Date+time.

Windows Phone 8

  • All Windows Phone 8 updates are published by Microsoft and notifications are sent to your phone when they are available. Installing these updates will ensure you have the latest changes for DST.To manually set the time, tap Settings> Date+time.

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Windows CE

Windows CE-based devices

All updates for Windows CE are available from the Windows Embedded Download Site

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Entourage and Outlook for Mac

Entourage and Outlook for Mac 2011

To ensure you have the latest updates for Daylight Savings Time and Time Zone changes you can do one of the following:

  • Select Check for updates in the Office for Mac 2011 Help menu. This will automatically search for the latest available updates.
  • Visit the Download Page on the Office for Mac website to find the latest available updates

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Windows Services For Unix (SFU) and Subsystem for UNIX-based Applications (SUA)

Windows Services For Unix (SFU) 3.5, Windows Services For Unix (SFU) 3.0, SUA in Windows Server 2003 R2, and SUA in Windows Vista

  • KB 977615 A hotfix is available for Windows Services for UNIX and for Subsystem for UNIX-based Applications to incorporate a cumulative DST update for December 2009

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Russian Time Zone Changes 2014

Summary
The Russian Federation passed a new Federal law No 248-FЗ from 21 July 2014 “On amending the Federal law “On the calculation of time”” which changes all of the current time zones used in the Russian Federation. The changes will take effect October 26, 2014 and, in summary, moves most of existing time zones back one hour, creates three new time zones and merges two existing time zones into one new one. These time zones will not observe ‘Summer Time’ / Daylight Saving Time (aka DST). Please read the response, impact and our recommended action sections for details.

Microsoft Response
On September 23, 2014, Microsoft releasd updates for Operating Systems to cover these changes. In addition, Belarus has until now shared time zone settings with Kaliningrad. As part of these changes we are creating a new “Belarus Standard Time” (Display name: (UTC+03:00) Minsk).

Windows Operating Systems
For Windows Operating Systems, KB2998527 provides full details of the changes as well as links to downloads. The change will occur on October 26, 2014 at 2:00 am local time. Therefore, the time zone offset changes and time zone revisions will be executed with the next click of the clock after 1:59:59h.

Potential Impact to Windows users.

1. Updates to 7 existing time zones to match with the new ones. Impact on users: Majority no impact, see summary of time zone changes*
Most (but not all) users who fall into these new time zones will have their settings automatically updated on Oct 26, 2014 to correct new time zones. Some users from will have to make changes manually, see summary of time zone changes for further information.

New Name of Time ZoneNew Display NameCurrent Name of Time ZoneCurrent Display Name
Russia Time Zone 1(UTC+02:00) Kaliningrad (RTZ 1)Kaliningrad Standard Time(UTC+03:00) Kaliningrad, Minsk
Russia Time Zone 2(UTC+03:00) Moscow, St. Petersburg, Volgograd (RTZ 2)Russian Standard Time(UTC+04:00) Moscow, St. Petersburg, Volgograd
Russia Time Zone 4(UTC+05:00) Ekaterinburg (RTZ 4)Ekaterinburg Standard Time(UTC+06:00) Ekaterinburg
Russia Time Zone 5(UTC+06:00) Novosibirsk (RTZ 5)N. Central Asia Standard Time(UTC+07:00) Novosibirsk
Russia Time Zone 6(UTC+07:00) Krasnoyarsk (RTZ 6)North Asia Standard Time(UTC+08:00) Krasnoyarsk
Russia Time Zone 7(UTC+08:00) Irkutsk (RTZ 7)North Asia East Standard Time(UTC+09:00) Irkutsk
Russia Time Zone 8(UTC+09:00) Yakutsk (RTZ 8)Yakutsk Standard Time(UTC+10:00) Yakutsk

2. Add 3 new time zones. Impact on users: Manual change required.
Users who fall into these new time zones will need to manually switch to the new time zones, otherwise they will remain in the current selected ones which will not be correct for their region after Oct 26, 2014.

New Name of Time Zone New Display NameCurrent Name of Time Zone Current Display Name
Russia Time Zone 3(UTC+04:00) Izhevsk, Samara (RTZ 3)N/AN/A
Russia Time Zone 10(UTC+11:00) Chokurdakh (RTZ 10)N/AN/A
Russia Time Zone 11(UTC+12:00) Anadyr, Petropavlovsk-Kamchatsky (RTZ 11)N/AN/A

3. Merge two existing time zones to a new one. Impact on users: Users in Vladivostok time zone, none, users in Magadan time zone, manual change required.
Windows will update “Vladivostok Standard Time” to the new time zone completely, and update time data only for "Magadan Standard Time" but leave the display/time zone name as is, so the user on the Vladivostok time zone won’t need to do anything (just as #1 above), but those on the other will need to manually switch in order to get the correct name. If they don’t, they’ll still have the correct time data after October 26, 2014, until Windows deprecates the "Magadan Standard Time" time zone in a later milestone.

New Name of Time ZoneNew Display NameCurrent Name of Time ZoneCurrent Display Name
Russia Time Zone 9(UTC+10:00) Vladivostok, Magadan (RTZ 9)Vladivostok Standard Time
Magadan Standard Time
(UTC+11:00) Vladivostok
(UTC+12:00) Magadan

4. Create new time zone for Belarus.
Impact on users: Users in Belarus who fall into the "Kaliningrad Standard Time" time zone will need to manually switch to this new time zone, otherwise they will be automatically updated to the new "Russia Time Zone 1" on October 26, 2014.

Belarus is currently sharing time zone setting with Kaliningrad, so Windows will create a new "Belarus Standard Time" as part of this update.

  • Time zone name: Belarus Standard Time
  • Display name: (UTC+03:00) Minsk
  • All other value remain the same as the current “Kaliningrad Standard Time” time zone.

*Summary of time zone changes.

Old ZoneNew Zones (bold – default)Summary
MSC-1RTZ1Kaliningrad Oblast (region) shifts to RTZ1 automatically.
Republic of Belarus – users need to choose their new zone manually.
MSCRTZ2, RTZ3Most regions of MSC go to RTZ2 automatically.
Udmurt Republic and Samara Oblast (region) should manually switch to RTZ3.
MSC+1MSC+1 was empty.
MSC+2RTZ4All regions from MSC+2 go to RTZ4 automatically.
MSC+3RTZ5, RTZ6Most regions go to RTZ5 automatically.
Kemerovo Oblast (region) should switch to RTZ6 manually.
MSC+4RTZ6All regions from MSC+4 go to RTZ6 automatically.
MSC+5RTZ7All regions from MSC+5 go to RTZ7 automatically.
MSC+6RTZ8, RTZ7Most regions from MSC+7 go to RTZ8 automatically.
Users from Zabaykalsky Krai (region) should switch to RTZ7 manually.
MSC+7RTZ9All regions from MSC+7 go to RTZ9 automatically.
MSC+8RTZ10, RTZ9, RTZ11Most regions from MSC+8 go to RTZ10 automatically.
Users from Magadan Oblast (region) should switch to RTZ9 manually.
Users from Chukotsky Avtonomny Okrug (Chukotka) and Kamchatsky Krai (Kamchatka) should switch to RTZ11 manually.

Changes in Republic of Belarus – Additional Information

New time zone for Republic of Belarus
Belarus is currently sharing time zone settings with Kaliningrad region. Starting 26th of October 2014 there will be different DST rules in Russia and Belarus. Time zone name for Kaliningrad also will changes to incorporate time zone name abbreviation – RTZ1. Therefore, Windows creates a dedicated time zone for Belarus as part of this update. The new time zone has the following characteristics:

  • Time zone name: Belarus Standard Time
  • Display name: (UTC+03:00) Minsk
  • All other values remain the same as for the current "Kaliningrad Standard Time" time zone

Impact on users: Users in Belarus who fall into the "Kaliningrad Standard Time" time zone will need to manually switch to this new time zone, otherwise they will be automatically updated to the new "Russia Time Zone 1" on October 26, 2014.

CountryCurrent time zone in WindowsNew time zone in Windows
Republic of BelarusKaliningrad Standard Time
(UTC+03:00) Kaliningrad, Minsk
Belarus Standard Time
(UTC+03:00) Minsk

Remarks

  • “(UTC+03:00) Kaliningrad, Minsk” time zone was introduced in Накопительном пакете обновления за август 2011 года (KB2570791), so its installation is pre-required before installing update discussed here.
  • Users in Republic of Belarus currently in (UTC+03:00) Kaliningrad, Minsk need to switch to (UTC+03:00) Minsk manually.
  • You may find more info in Microsoft KB article http://support.microsoft.com/kb/2625508

General Information

Note: Applicable systems for this update will be the same as those for the latest cumulative update, and all systems will need to have the latest cumulative update installed before this update can be applied. You can find the latest time zone cumulative update for Windows here.

Other Microsoft Products
Apart from Windows, some Microsoft Products require updates/mitigations specifically for the Russian Time Zone change. These are:

Microsoft Exchange Server
For Exchange Server, please see KB3004235

Outlook for Mac
For Outlook for Mac 2011, please see KB3003031

Microsoft Dynamics CRM
Update Rollup 1 for Microsoft Dynamics CRM 2013 Service Pack 1. See 3004235
Microsoft Dynamics CRM 2011 Update Rollup 18. See KB2958724
Microsoft Dynamics CRM 4 Update Rollup 21. See KB2621054

Microsoft SharePoint
For SharePoint Online, please see http://support.microsoft.com/kb/3009590 For SharePoint On Premise, to temporarily work around this issue, you can set the Time Zone setting in the Regional Settings page to match the offset for your specific zone. Be aware that you must change this setting back to your specific time zone after the update is deployed.

Windows Phone
While the current Windows Phone 8.1 OS and earlier does not yet take Russian DST changes into account, we are working on it for a future update. Until your phone receives the next update, you may need to set the time manually beginning October 26, 2014:

  1. In the App list, tap Settings > date+time.
  2. Slide "Set date and time automatically" to Off.
  3. Set "Time" to the correct time.

General Updates for other Microsoft Products that are affected by DST and TimeZone changes are listed on the Available DST and TZ Updates for Microsoft Products page of the Daylight Saving Time Help and Support Center.

Information will continue to be updated on the Daylight Saving Time Help and Support Center

Last Review : December 9, 2014