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Article ID: 2570791 - Last Review: October 12, 2011 - Revision: 12.0

Support for Windows Vista Service Pack 1 (SP1) ended July 12, 2011. To continue receiving security updates for Windows, make sure that you are running Windows Vista with Service Pack 2 (SP2). For more information, refer to this Microsoft webpage:
Support is ending for some versions of Windows (http://windows.microsoft.com/en-us/windows/help/end-support-windows-xp-sp2-windows-vista-without-service-packs)
Important This update supersedes and replaces update 2443685, which was released in December 2010. This update also includes additional time zone changes released as hotfixes after update 2443685 was published.

If you have already deployed update 2443685, read the descriptions of the specific time zone changes that are addressed in this article to determine whether you must deploy this update immediately. If systems are not directly affected, you can schedule deployment at the next available opportunity.

We recommend that you deploy the most current Windows cumulative time zone update to guarantee the consistency of the time zone database on all systems.

Important
  • Before you apply the update that is described in this article, be aware of potential issues that may affect Microsoft Outlook.

    For more information about these issues, view the article in the Microsoft Knowledge Base:
    931667  (http://support.microsoft.com/kb/931667/ ) How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook
  • If you are running Microsoft Exchange Server in an Information Technology (IT) environment, you must take additional measures to guarantee the correct operation of Exchange Server.

    For more information about the Exchange daylight saving time (DST) update, view the article in the Microsoft Knowledge Base:
    941018  (http://support.microsoft.com/kb/941018/ ) How to address daylight saving time by using the Exchange Calendar Update Tool
  • Cumulative time zone updates contain only data that has changed for a specific region or that was added to maintain parity with other operating system versions. Therefore, if a time zone key is deleted, some original values may not be restored after you apply the cumulative zone update.

    We do not recommend that you delete any registry keys that are related to time zones. On a computer that has incomplete time zone keys, first restore the time zone keys from a known good backup. Then, apply the update.

On This Page

Introduction

The update that this article describes changes the time zone data to accommodate daylight saving time (DST) changes in several countries.

The update that this article describes is a cumulative update rollup that includes the changes previously released as hotfixes in Microsoft Knowledge Base (KB) articles 2543367, 2523087, 2519231 and 2515337. This cumulative update also includes additional fixes not included in previous released hotfixes. For more information about how DST changes may affect other Microsoft products, visit the following Microsoft website:
http://support.microsoft.com/gp/cp_dst (http://support.microsoft.com/gp/cp_dst)
For more information about how daylight saving time changes may affect other Microsoft products, view the following article in the Microsoft Knowledge Base:
914387  (http://support.microsoft.com/kb/914387/ ) How to configure daylight saving time for Microsoft Windows operating systems
Note When you apply this update, you may receive the following message:
Update cannot be installed as a newer or same time zone update has already been installed on the system.
This message indicates that you have already applied the correct update or that Windows Updates or Microsoft Update has automatically installed this update. No additional action is required to update the Windows operating system.

The following files are available for download from the Microsoft Download Center:

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Download
Download the Update for Windows 7 (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=0393e644-b9f1-4063-a23a-a484f91db30b)

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Download the Update for Windows 7 for x64-based Systems (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=4bc2bd73-86dd-4444-809b-6d797d72ccfd)

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Download the Update for Windows Server 2008 R2 x64 Edition (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=bb274326-ade0-4c10-94ad-dfe745d496a7)

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Download the Update for Windows Server 2008 R2 for Itanium-based Systems (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=76aeb7af-1762-4a36-bde0-de99f08d6f77)

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Download the Update for Windows Vista SP2 (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=bd3842a4-f3ff-4f17-9975-ae9f04548e17)

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Download the Update for Windows Vista SP2 for x64-based Systems (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=d2785863-96b0-444c-9943-d8ed55841f2e)

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Download the Update for Windows Server 2008 SP2 (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=749a9cb2-1b38-4d19-baea-0efebdb1b5b8)

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Download the Update for Windows Server 2008 SP2 for Itanium-based Systems (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=353325a5-c03c-4697-aef2-8cef213e5064)

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Download the Update for Windows Embedded Standard 7 for x64-based Systems (KB2570791) package now. (http://www.microsoft.com/downloads/details.aspx?FamilyId=7a52eba6-d035-434e-b8c9-15fd60e3ec49)

Release Date: August 9, 2011

For more information about how to download Microsoft support files, view the following article in the Microsoft Knowledge Base:
119591  (http://support.microsoft.com/kb/119591/ ) How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.

Updates from the previous cumulative Windows time zone update

The following changes were made since the previous Windows cumulative time zone update:
  • Turkey Standard Time:
    A new Windows time zone was created: Turkey Standard Time. The display name is "(UTC+2:00) Istanbul." The government of Turkey has decided to change the 2011 DST schedule. It will start on Monday March 28 instead of Sunday March 27.
    "Istanbul" was removed from the display name of the "(UTC+2:00) Athens, Bucharest, Istanbul" time zone.
  • Egypt Standard Time [Display Name "(UTC+2:00) Cairo"]:
    The government of Egypt has canceled daylight saving time.
  • Pacific SA Standard Time [Display Name "(UTC-4:00) Santiago"]:
    Sets the 2011 DST start date to occur in August and the 2012 end date to occur in March. 
  • Morocco Standard Time [Display Name "(UTC) Casablanca"]:
    Sets the 2011 DST end date to occur in July.
  • Fiji Standard Time [Display Name "(UTC+12:00) Fiji"]:
    Sets the 2011 DST end date to occur on the first Sunday in March.
  • Samoa Standard Time [Display Name "(UTC-11:00) Samoa"]:
    Sets the 2011 DST end time to occur one hour later.
Collapse this tableExpand this table
Time zone key name Display name 2011 DST start 2011 DST endTZI subkey
Turkey Standard Time(UTC+2:00)IstanbulLast Monday in March

03:00:00.000
Last Sunday in October

04:00:00.000
"TZI"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,0a,00,00,00,05,00,04,00,00,00,00,00,00,00,00,00,03,00,01,00,05,00,03,00,00,00,00,00,00,00
Egypt Standard Time(UTC+02:00) CairoNoneNone"TZI"=hex:88,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Pacific SA Standard Time(UTC-04:00)SantiagoThird Saturday in August

23:59:59.999
First Saturday in May

23:59:59.999
"TZI"=hex:f0,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,05,00,06,00,01,00,17,00,3b,00,3b,00,e7,03,00,00,08,00,06,00,03,00,17,00,3b,00,3b,00,e7,03
Morocco Standard Time(UTC)CasablancaFirst Saturday in April

23:59:59.999
Last Saturday in July

23:59:59.999
"TZI"=hex:00,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,07,00,06,00,05,00,17,00,3b,00,3b,00,e7,03,00,00,04,00,06,00,01,00,17,00,3b,00,3b,00,e7,03
Fiji Standard Time(UTC+12:00)FijiFourth Sunday in October

02:00:00.000
First Sunday in March

03:00:00.000
"TZI"=hex:30,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,03,00,00,00,01,00,03,00,00,00,00,00,00,00,00,00,0a,00,00,00,04,00,02,00,00,00,00,00,00,00
Samoa Standard Time(UTC-11:00)SamoaLast Sunday in September

00:00:00.000
First Sunday in April

01:00:00.000
"TZI"=hex:94,02,00,00,00,00,00,00,c4,ff,ff,ff,00,00,04,00,00,00,01,00,01,00,00,00,00,00,00,00,00,00,09,00,00,00,05,00,00,00,00,00,00,00,00,00
In addition to these changes, the August 2011 DST cumulative update contains revisions for the following time zones:

  • Updated the UTC offsets and removed DST for the time zones that are listed in the table.
Collapse this tableExpand this table
Time ZoneOldNew
Russian Standard Time (UTC +3:00) Moscow, St Petersburg, Volgograd(UTC +4:00) Moscow, St Petersburg, Volgograd
Ekaterinburg Standard Time(UTC +5:00) Ekaterinburg(UTC +6:00) Ekaterinburg
N. Central Asia Standard Time(UTC +6:00) Novosibirsk(UTC +7:00) Novosibirsk
North Asia Standard Time(UTC +7:00) Krasnoyarsk(UTC +8:00) Krasnoyarsk
North Asia East Standard Time(UTC +8:00) Irkutsk(UTC +9:00) Irkutsk
Yakutsk Standard Time(UTC +9:00) Yakutsk(UTC +10:00) Yakutsk
Vladivostok Standard Time(UTC +10:00) Vladivostok(UTC +11:00) Vladivostok
Magadan Standard Time(UTC +11:00) Magadan(UTC +12:00) Magadan
  • Kaliningrad Standard Time [Display Name "(UTC+3:00) Kaliningrad"]:
    A new Windows time zone was created, and it has the display name "(UTC+3:00) Kaliningrad." This time zone does not observe daylight saving time.
  • Newfoundland Standard Time [Display Name "(UTC-3:30) Newfoundland"]:
    The DST start time and end time were updated from 12:01 A.M. to 2:00 A.M.
Collapse this tableExpand this table
Time zone key name Display name 2011 DST start 2011 DST endTZI subkey
Russian Standard Time(UTC +4:00) Moscow, St. Petersburg, VolgogradNoneNone“TZI”=hex: 10,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Ekaterinburg Standard Time(UTC +6:00) EkaterinburgNoneNone“TZI”=hex:98,fe,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
N. Central Asia Standard Time(UTC +7:00) NovosibirskNoneNone“TZI”=hex:5c,fe,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
North Asia Standard Time(UTC +8:00) KrasnoyarskNoneNone“TZI”=hex:20,fe,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
North Asia East Standard Time(UTC +9:00) IrkutskNoneNone“TZI”=hex:e4,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Yakutsk Standard Time(UTC +10:00) YakutskNoneNone“TZI”=hex:a8,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Vladivostok Standard Time(UTC +11:00) VladivostokNoneNone“TZI”=hex:6c,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Magadan Standard Time(UTC +12:00) MagadanNoneNone“TZI”=hex:30,fd,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Kaliningrad Standard Time(UTC +3:00) KaliningradNoneNone“TZI”=hex:4c,ff,ff,ff,00,00,00,00,c4,ff,ff,ff,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00
Newfoundland Standard Time(UTC-3:30) NewfoundlandSecond Sunday in March

00:01:00:000
First Sunday in November

02:00:00:000
“TZI”=hex:d2,00,00,00,00,00,00,00,c4,ff,ff,ff,00,00,0b,00,00,00,01,00,02,00,00,00,00,00,00,00,00,00,03,00,00,00,02,00,00,00,01,00,00,00,00,00


Known issues

After you install this update, conversion of old 2011 winter dates from UTC to local time for the affected Russian time zones uses the incorrect offset (+4 instead of +3 in the case of Russian Standard time). This issue affects the old winter dates only (January 2011 until the start of DST in 2011).

Windows XP

Prerequisites

You must have Windows XP Service Pack 3 (SP3) installed to apply this update. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
322389  (http://support.microsoft.com/kb/322389/ ) How to obtain the latest Windows XP service pack

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

Note You can install this cumulative update rollup even after you have installed any of the following previously released updates. This update replaces the following update:
2443685  (http://support.microsoft.com/kb/2443685/ ) December 2010 cumulative time zone update for Microsoft Windows operating systems

Windows Server 2003

Prerequisites

You must have Windows Server 2003 SP2 installed to apply this update. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
889100  (http://support.microsoft.com/kb/889100/ ) How to obtain the latest service pack for Windows Server 2003

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

Note You can install this cumulative update rollup even after you have installed any of the following previously released updates. This update replaces the following update:
2443685  (http://support.microsoft.com/kb/2443685/ ) December 2010 cumulative time zone update for Microsoft Windows operating systems

Windows Vista or Windows Server 2008

Prerequisites

You must have Windows Vista or Windows Server 2008 Service Pack 2 installed to apply this update.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

Note You can install this cumulative update rollup even after you have installed any of the following previously released updates. This update replaces the following update:
2443685  (http://support.microsoft.com/kb/2443685/ ) December 2010 cumulative time zone update for Microsoft Windows operating systems

Windows 7 or Windows Server 2008 R2

Prerequisites

No prerequisites are required to apply this update. The same package installs both on the RTM version as well as the SP1 versions of Windows 7 and Windows Server 2008 R2.

Restart requirement

You may have to restart the computer after you apply this update.

Update replacement information

Note You can install this cumulative update rollup even after you have installed any of the following previously released updates. This update replaces the following update:
2443685  (http://support.microsoft.com/kb/2443685/ ) December 2010 cumulative time zone update for Microsoft Windows operating systems







APPLIES TO
  • Windows 7 Enterprise
  • Windows 7 Home Basic
  • Windows 7 Home Premium
  • Windows 7 Professional
  • Windows 7 Starter
  • Windows 7 Ultimate
  • Windows 7 Service Pack 1
  • Windows Vista Service Pack 2
  • Microsoft Windows XP Service Pack 3
  • Windows Server 2008 R2 Datacenter
  • Windows Server 2008 R2 Enterprise
  • Windows Server 2008 R2 for Itanium-Based Systems
  • Windows Server 2008 R2 Foundation
  • Windows Server 2008 R2 Standard
  • Windows Server 2008 R2 Service Pack 1
  • Windows Server 2008 Service Pack 2
  • Microsoft Windows Server 2003 Service Pack 2
  • Windows Embedded Standard 7
Keywords: 
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