Microsoft Daylight Saving Time & Time Zone Blog

This is the blog maintained by staff at Microsoft to provide general information, announcements and provide answers to Frequently Asked Questions (FAQs) related to daylight saving time (DST) and time zone (TZ) changes around the world. * Important Notice

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  • Blog Post: Argentina is changing their daylight saving time on December 30

    (cross posted from this blog entry ) This past week, the government of Argentina approved a new change to their observance of daylight saving time in the country effective this Sunday, December 30, 2007 at 12:00am to March 16th, 12:00 for Argentina. According to Reuters, "under the new law, which...
  • Blog Post: Daylight saving time ends this weekend, November 2, in much of North America (posted October 30, 2008)

    Daylight saving time ends this weekend in much of North America. The US Energy Policy Act of 2005 introduced changes to the start and end dates of DST beginning in 2007. Now, DST in North America is observed across most of the United States as well as Canada from the second Sunday in March through to...
  • Blog Post: Applications using historical data from 2006 (or any previous years) can have invalid results

    Executive Summary: Applications using historical data from 2006 (or any previous years) can have invalid results. Microsoft is currently working to provide support for vendors and software developers for their applications, if the application does not provide historical DST start and end-date tables...
  • Blog Post: Daylight Saving Time Begins Sunday, March 9, in the US and Canada

    [cross posted to http://blogs.msdn.com/mthree/archive/2008/03/07/dst-arrives-030708.aspx ] Daylight Saving Time begins in much of the US and Canada this weekend, as noted in more than 2,200 news articles today on March 9 , several weeks earlier than in years prior to 2007. As you may recall, last...
  • Blog Post: Chile announces an extension on their Daylight Saving Time for 2008

    The government of Chile announced on February 7, 2008, that their current daylight saving time will be extended in order to save energy. The new fall back date for the daylight saving period of 2007-2008 is: Daylight saving time ends: Last Saturday of March at 11:59:59PM Information is available...
  • Blog Post: What is the impact on SharePoint by the Daylight Saving Time change in 2007?

    Q: Where can I find out more about the status of any impact on SharePoint by the Daylight Saving Time change in 2007? A: Please see http://blogs.msdn.com/sharepoint/archive/2007/03/10/key-us-daylight-savings-time-information.aspx on the official blog of the SharePoint Product Group with more complete...
  • Blog Post: Advisory: Potential changes to Daylight Saving Time in Iraq

    Microsoft has learned of a potential change to the observance of Daylight Saving Time (DST) in Iraq that may impact customers using the Baghdad time zone. An early, unsubstantiated report is that the Ministry of Iraq has decided that the country will no longer observe DST as they have in prior years...
  • Blog Post: DST 2007: Unable find mailbox timezone:Error 0x80004005

    DST 2007: Unable find mailbox timezone:Error 0x80004005 This article deals with understanding and troubleshooting the famous " Unable find mailbox timezone:Error 0x800004005 " while extracting time zone information from users during the extraction mode of the Exchange Calendaring Tool. (Author...
  • Blog Post: Remember: April 1st is not this year's daylight saving time 'spring forward' date

    If you did not apply the updates to your various PCs and devices as noted on our http://www.microsoft.com/dst2007 daylight saving time information site, but manually adjusted the time, please note that older devices may 'spring forward' on the first Sunday in April (the old beginning of DST). As USA...
  • Blog Post: Help desk guidelines on Daylight Saving Time for Microsoft Office Outlook Calendars

    The Exchange team has posted a helpdesk-oriented document that provides recommendations and prescriptive guidance for updating Outlook calendars to comply with the Daylight Saving Time (DST) 2007 rule changes. The goal is to provide an Outlook user with a "personal touch" experience to help them understand...