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

[Nakul_Bhagat]

First published on TECHNET on Aug 22, 2007

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

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