Microsoft Daylight Saving Time & Time Zone Blog : KB article

Announcement: Microsoft Windows 2009 Daylight Saving Time and Time Zones Hotfix available for Egypt, Western Australia

atsim — Thu, 27 Aug 2009 02:40:00 GMT

Once again, as has happened in the past, a couple of countries will see new changes to their observation of Daylight Saving Time (DST) , this time in Egypt and Western Australia.

A new Microsoft Knowledge Base article is up – KB 974176 – noting the hotfix now available to update the Daylight Saving Time for the "(GMT+02:00) Cairo" and "(GMT+08:00) Perth" time zones for the year 2009 for Windows Server 2003-based, Windows Vista-based, Windows Server 2008-based, and Windows 7-based computers.

Egypt has announced to change the Daylight Saving Time (DST) to end on midnight August 21st. This hotfix updates the end date of DST for the "(GMT+02:00) Cairo" time zone in 2009. The clock will move one hour backward at midnight between August 20th and August 21st.
Australia has announced the end of Daylight Saving Time for the Western Australia time zone. This hotfix removes the Daylight Saving Time for the "(GMT+08:00) Perth" time zone.
More specifically, this hotfix:

· Sets DST end date for Egypt at 23:59:59.999 on August 20th, 2009

· Removes DST for Western Australia time zone in 2009.

To get the hotfix, click here to view and request hotfix downloads.

Please note that these packages are call-in/request only packages and will not be released to the Microsoft Download Center or via Microsoft Update Services. This change will be included in the next DST Windows cumulative package released for all currently supported operating systems in December 2008 (Windows XP, Windows Server 2003, Windows Server 2008 and Windows Vista).

Microsoft strongly recommends that DST and time zone updates be installed on all impacted systems, devices and applications to ensure consistency with current DST rules and time zone settings worldwide. Customers should review the product updates available and posted on this site and at http://support.microsoft.com/gp/dst_prodlist for the latest and updated information of Microsoft products affected by daylight saving time.

An important note for Consumers

For those customers (consumers, small businesses) wondering "Does this mean I have to install the updates manually?"

No. Generally, consumers can wait for the updates to be installed via Windows Update rather than download and install these from the DLC. And for end users who have their PCs managed by a central administrator, your IT folks will handle the distribution and updating of your PCs over the network.

Additional information

Please note that where we have heard that changes may be coming to a territory but have yet to receive an official confirmation from a government, we indicate that the changes are "not yet confirmed."

As a reminder on our cadence (outlined here), our product teams are have moved to a semi-annual product update cadence (with provisions for out-of-band releases as needed). Following the Windows regular cadence for publishing newly legislated DST rules and time zone updates, our "Cumulative DST and Time Zone Updates" will be released in November/ December (to the Download Centre and via Windows Update respectively) for the coming calendar year; we also provide semi-annual updates (like this one) in the July/August timeframe as needed.

For each, the window closes for additional updates a few months (generally four to six) prior to the release date.

Most Windows applications (and some services) reference the underlying OS for DST and time zone information, but some do not. The product and service groups with offerings that have internal DST or TZ references have agreed to follow the regular schedule for cumulative Windows OS DST & TZ updates. The regular Windows release provide a regular schedule for other product groups to follow, as noted in the DST & TZ Product Update Cadence policy. We hope that this will provide a more predictable way for our customers to anticipate and plan for our cumulative updates

Notice: Hotfix Available for Morocco 2009 Daylight Saving Time

atsim — Wed, 27 May 2009 18:06:00 GMT

Morocco has announced the start of DST for 2009 on June 1st at midnight. The clock will move one hour forward at midnight between May 31st and June 1st, and then move one hour back at midnight between August 20th and August 21st in 2009. There was no DST for Morocco in 2009 prior to this update.

More specifically, this update sets DST for Morocco as follows:

• DST starts at 23:59:59 on May 31st, 2009

• DST ends at 23:59:59 on August 20th, 2009

Microsoft has produced a hotfix to implement this change. If interested in downloading this hotfix, please refer to KB 970613 titled: “A hotfix is available to update the Daylight Saving Time for the "(GMT) Casablanca" time zone for the year 2009 for Windows XP-based, Windows Server 2003-based, Windows Vista-based and Windows Server 2008-based computers”.

Notice: Now also available for Windows XP and Windows Server 2003: Optional Hotfix Available for Pakistan 2009 Daylight Saving Time

atsim — Fri, 17 Apr 2009 23:25:00 GMT

As reported in various publications, including Daily Times, Pakistan has announced the start of DST for 2009 on April 15^th at midnight. This information is subject to change as it has not been officially confirmed by a Pakistani government source.

Last Monday a hotfix was released to implement this change for Windows Vista and Windows Server 2008. The update is now also available for Windows XP and Windows Server 2003. If interested in downloading this hotfix, please refer to KB 970084 titled: “A hotfix is available to update the Daylight Saving Time for the "(GMT +5:00) Islamabad, Karachi" time zone for the year 2009 for Windows XP-based, Windows Server 2003-based, Windows Vista-based and Windows Server 2008-based computers”.

Notice: Optional Hotfix Available for Pakistan 2009 Daylight Saving Time

atsim — Tue, 14 Apr 2009 06:11:00 GMT

Microsoft has produced a hotfix to implement this change for Windows Vista and Windows Server 2008. If interested in downloading this hotfix, please refer to KB 970084 titled: “A hotfix is available to update the Daylight Saving Time for the "(GMT +5:00) Islamabad, Karachi" time zone for the year 2009 for Windows Vista-based and Windows Server 2008-based computers”.

For other Windows versions, please refer to KB 914387 “How to configure daylight saving time for Microsoft Windows operating systems” on how to update the time zone registry key.

Q: Is there a list of the time zones and daylight saving time changes in Windows?

atsim — Wed, 22 Aug 2007 07:41:00 GMT

Q: Is there a list of the time zones [and daylight saving time/ summer time] changes in Windows?"

A: yes, there is a list of all changes included in KB article 933360, "August 2007 cumulative time zone update for Microsoft Windows operating systems," that notes that the following changes have been made since the previous Windows cumulative time zone update in February (KB article 931836) :

Caucasus Standard Time: Changes display name to Caucasus Standard Time as cities in the previous display name have separate time zones, and removes DST settings.
Armenian Standard Time: Creates a new time zone for Armenia to better align with different DST changes in the Caucasus region.
New Zealand Standard Time: Adjusts DST start dates and end dates according to changes signed in to law after the prior cumulative time zone update was created (February 2007).
GTB Standard Time: Corrects the display name for GTB Standard Time on Windows Server 2003 SP2 to include Bucharest.
Jordan Standard Time: Adjusts DST start times, end times, and dates according to changes signed in to law after the prior cumulative time zone update was created (February 2007).

A list of the display names and GMT offsets are noted here for your review...

Registry subkey name	Display name	Daylight name	Standard name	DST start	DST end
Alaska Standard Time	(GMT-09:00) Alaska	Alaskan Daylight Time	Alaskan Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



Armenian Standard Time	(GMT +04:00) Yerevan	Armenian Daylight Time	Armenian Standard Time	Last Sunday in March at 2:00:00 AM	Last Sunday in October 3:00:00 AM



Atlantic Standard Time	(GMT-04:00) Atlantic Time (Canada)	Atlantic Daylight Time	Atlantic Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



AUS Eastern Standard Time	(GMT+10:00) Canberra, Melbourne, Sydney	AUS Eastern Daylight Time	AUS Eastern Standard Time	Unchanged	Last Sunday in March at 03:00:00



Azerbaijan Standard Time	(GMT+04:00) Baku	Azerbaijan Daylight Time	Azerbaijan Standard Time	Last Sunday in March at 04:00:00	Last Sunday in October at 05:00:00



Caucasus Standard Time	(GMT +04:00) Caucasus Standard Time	Caucasus Daylight Time	Caucasus Standard Time	removed	removed



Cen. Australia Standard Time	(GMT+09:30) Adelaide	Cen. Australia Daylight Time	Cen. Australia Standard Time	Unchanged	Last Sunday in March at 03:00:00



Central Brazilian Standard Time	(GMT-04:00) Manaus	Central Brazilian Daylight Time	Central Brazilian Standard Time	First Sunday in November at 00:00:00	Last Sunday in February at 00:00:00



Central Standard Time	(GMT-06:00) Central Time (US & Canada)	Central Daylight Time	Central Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



Central Standard Time (Mexico)	(GMT-06:00) Guadalajara, Mexico City, Monterrey	Central Daylight Time (Mexico)	Central Standard Time (Mexico)	First Sunday in April at 02:00:00	Last Sunday in October at 02:00:00



E. Europe Standard Time	(GMT+02:00) Minsk	E. Europe Daylight Time	E. Europe Standard Time	Last Sunday in March at 02:00:00	Last Sunday in October at 03:00:00



E. South America Standard Time	(GMT-03:00) Brasilia	E. South America Daylight Time	E. South America Standard Time	First Sunday in November at 00:00:00	Last Sunday in February at 00:00:00



Eastern Standard Time	(GMT-05:00) Eastern Time (US and Canada)	Eastern Daylight Time	Eastern Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



Egypt Standard Time	(GMT+02:00) Cairo	Egypt Daylight Time	Egypt Standard Time	Last Thursday in April at 23:59:59.999	Last Thursday in September at 23:59:59.999



Georgian Standard Time	(GMT+03:00) Tbilisi	Georgian Daylight Time	Georgian Standard Time	Removed	Removed



Greenwich Standard Time	(GMT) Casablanca, Monrovia, Reykjavik	Greenwich Daylight Time	Greenwich Standard Time	Not applicable	Not applicable



GTB Standard Time	(GMT+02:00) Athens, Bucharest, Istanbul	GTB Daylight Time	GTB Standard Time	Last Sunday of March at 3:00:00	Last Sunday in October at 04:00:00



Iran Standard Time	(GMT+03:30) Tehran	Iran Daylight Time	Iran Standard Time	Removed	Removed



Israel Standard Time	(GMT+02:00) Jerusalem	Jerusalem Daylight Time	Jerusalem Standard Time	March 30, 2007 at 02:00:00	September 16, 2007 at 02:00:00



Jordan Standard Time	(GMT+2:00) Amman	Jordan Daylight Time	Jordan Standard Time	Last Thursday in March at 11:59:59	Last Friday in October at 01:00:00



Middle East Standard Time	(GMT+02:00) Beirut	Middle East Daylight Time	Middle East Standard Time	Last Sunday in March at 00:00	Last Saturday in October at 23:59:59.999



Montevideo Standard Time	(GMT-03:00) Montevideo	Montevideo Daylight Time	Montevideo Standard Time	First Sunday in October at 02:00:00	Second Sunday in March at 02:00:00



Mountain Standard Time	(GMT-07:00) Mountain Time (US and Canada)	Mountain Daylight Time	Mountain Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



Mountain Standard Time (Mexico)	(GMT-07:00) Chihuahua, La Paz, Mazatlan	Mountain Daylight Time (Mexico)	Mountain Standard Time (Mexico)	First Sunday in April at 02:00:00	Last Sunday in October at 02:00:00



Myanmar Standard Time	(GMT+06:30) Yangon (Rangoon)	Myanmar Daylight Time	Myanmar Standard Time	Not applicable	Not applicable



Namibia Standard Time	(GMT+02:00) Windhoek	Namibia Daylight Time	Namibia Standard Time	First Sunday in April at 02:00:00	First Sunday in September at 02:00:00



New Zealand Standard Time	(GMT+12:00) Auckland, Wellington	New Zealand Daylight Time	New Zealand Standard Time	Last Sunday in September at 02:00:00	First Sunday in April at 03:00:00



Newfoundland Standard Time	(GMT-3:30) Newfoundland	Newfoundland Daylight Time	Newfoundland Standard Time	Second Sunday of March at 00:01:00	First Sunday of November at 00:01:00



Pacific SA Standard Time	(GMT-04:00) Santiago	Pacific SA Daylight Time	Pacific SA Standard Time	Second Saturday in October at 23:59:59.999	Second Saturday in March at 23:59:59.999



Pacific Standard Time	(GMT-08:00) Pacific Time (US & Canada)	Pacific Daylight Time	Pacific Standard Time	Second Sunday in March at 02:00:00	First Sunday in November at 02:00:00



Pacific Standard Time (Mexico)	(GMT-08:00) Tijuana, Baja California	Pacific Daylight Time (Mexico)	Pacific Standard Time (Mexico)	First Sunday in April at 02:00:00	Last Sunday in October at 02:00:00



SA Pacific Standard Time	(GMT-05:00) Bogota, Lima, Quito, Rio Branco	SA Pacific Daylight Time	SA Pacific Standard Time	Not applicable	Not applicable



Sri Lanka Standard Time	(GMT+05:30) Sri Jayawardenepura	Sri Lanka Daylight Time	Sri Lanka Standard Time	Not applicable	Not applicable



Tasmania Standard Time	(GMT+10:00) Hobart	Tasmania Daylight Time	Tasmania Standard Time	Unchanged	Last Sunday in March at 03:00:00



W. Australia Standard Time	(GMT+08:00) Perth	W. Australia Daylight Time	W. Australia Standard Time	Last Sunday in October at 02:00:00	Last Sunday in March at 03:00:00

Important notes from this KB...

This update supersedes and replaces update KB931836, released in January 2007. This update also includes additional time zone changes that were signed in to law after update KB931836 was created. Customers who have already deployed update KB931836 should evaluate whether any of the five specific time zone changes that are addressed in the update described by this Microsoft Knowledge Base (KB) article merit deploying this update immediately. If systems are not directly affected, you can schedule deployment at the next available opportunity. We recommend that all customers standardize on the most current Windows cumulative time zone update to guarantee the consistency of the time zone database on all systems.
Before you apply the update that is described by this article, be aware of potential issues that may affect Microsoft Office Outlook. For more information about these issues, click the following article number to view the article in the Microsoft Knowledge Base: 931667 (http://support.microsoft.com/kb/931667/) How to address the daylight saving time changes in 2007 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 informationabout the Exchange daylight saving time (DST) update, click the following article number to view the article in the Microsoft Knowledge Base: 926666 (http://support.microsoft.com/kb/926666/) Update for daylight saving time changes in 2007 for Exchange 2003 Service Pack 2

Tags: Microsoft, Daylight Saving Time, Daylight Savings Time, DST. 629,244; 954,983; 1,750,000

KB 932395 updated: Commerce Server 2002, Commerce Server 2007 for DST 2007

atsim — Wed, 22 Aug 2007 06:54:00 GMT

Please note that for Microsoft Commerce Server 2002 and Commerce Server 2007, KB article 932395 has been updated.

This article outlines how to update these Microsoft products to meet the updated time zone changes (including the changes to observation of DST in New Zealand) as outlined in KB 933360, "August 2007 cumulative time zone update for Microsoft Windows operating systems."

APPLIES TO

•	Microsoft Commerce Server 2007 Enterprise Edition
•	Microsoft Commerce Server 2007 Developer Edition
•	Microsoft Commerce Server 2007 Standard Edition
•	Microsoft Commerce Server 2002 Standard Edition