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: Updates Available for Egypt DST Ramadan Exception in 2014

    The government of Egypt has decided to pause DST during the holy month of Ramadan in 2014, from Friday, June 27 at 00:00 to Friday, August 1 at 00:00. Fix it solutions for Windows have been released to address this change, and you can find the details and download them here: http://support.microsoft...
  • Blog Post: Updates Available for Morocco DST Ramadan Exception in 2014

    The government of Morocco has decided to pause DST during the holy month of Ramadan in 2014, from Saturday, June 28 at 3AM to Saturday, August 2 at 2AM. Fix it solutions for Windows have been released to address this change, and you can find the details and download them here: http://support.microsoft...
  • Blog Post: Updates available for Paraguay, Turkey and Chile time zones

    This time zone update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: Chile Chile has changed its DST start date to September 7 at 00:00:00 and DST end date to April 27 at 00:00:00 for the year 2014. Turkey ...
  • Blog Post: Hotfix available for Chile DST change

    The government of Chile has extended Daylight Saving Time for 2012 [ Official Decree ]. DST for mainland Chile now ends on April 28, 2012 and starts on September 1, 2012. A hotfix for Windows has been released to address this change. You can find details of the hotfix and download it here [ KB2681116...
  • Blog Post: December 2011 DST Cumulative Update for Windows operating systems

    The December 2011 DST Cumulative update for Windows operating systems has been published on Microsoft Download Center. It contains the following changes: Kaliningrad Standard Time: As previously announced in KB2625508 , Belarus has decided to discontinue daylight saving time from 2011 and stay...
  • Blog Post: Notice: Now also available for Windows XP and Windows Server 2003: Optional Hotfix Available for Pakistan 2009 Daylight Saving Time

    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...
  • Blog Post: Advisory: DST cancellations in Belarus, Ukraine and Armenia

    Ukraine , Belarus , and Armenia have decided to discontinue daylight saving time starting from 2011. These countries are mirroring Russia's changes by staying on "summer time" indefinitely and not falling back to "winter time" on October 30th 2011. Microsoft’s guidance to customers in the affected...
  • Blog Post: Armenia cancels DST

    Disclaimer : The information in this document is written in response to an announcement by the government of Armenia about changes in the daylight saving time in Armenia for the year of 2012. The steps provided in this bulletin were created to mitigate the impacts that the daylight saving time...
  • Blog Post: Announcement: Upcoming Microsoft webcast on daylight saving time changes in Russia

    Update : The recorded webcast is now available on-demand here . Understanding and preparing for the 2011 Russian Daylight Savings Time Change September 15, 2011 10:00 am to 11:30 am Pacific Time Click here to calculate your local time. Presented By: M3 Sweatt, Partner...
  • Blog Post: Hotfix Available for Bangladesh 2009/2010 Daylight Saving Time

    12/28/2009 Update: As announced today, Bangladesh has decided to end DST on December 31, 2009. This hotfix does not address this most recent change on Bangladesh's time. Please stay tuned for more information on Bangladesh's newest DST change. According to an announcement from the Bangladesh government...
  • Blog Post: December 2012 DST Cumulative Update for Windows operating systems

    The December 2012 DST Cumulative update for Windows operating systems has been published on Microsoft Download Center. It contains the following changes: Bahia Standard Time: Starting in 2012, Bahia Standard Time will no longer have DST. Azores Standard Time: Changes reflect the end of...
  • Blog Post: Notice: Ukraine and Armenia revert 2011 DST cancellation

    The previous post calls out planned 2011 DST cancellations for Belarus, Ukraine and Armenia [ link ]. We have received reports that Armenia and Ukraine have canceled their proposed changes. According to reports in Rada and Kyivpost , Ukraine will not stay on permanent summer time and instead will...
  • Blog Post: Notice: Optional Hotfix Available for Pakistan 2009 Daylight Saving Time

    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. Microsoft has produced a hotfix to implement...
  • Blog Post: Microsoft Announces Update to Support Policy for Daylight-Saving Time or Time Zone Changes

    As part of Microsoft’s continued focus on customer satisfaction, we are announcing a revision to the Microsoft Support Lifecycle policy regarding the availability of Daylight Saving Time (DST) or Time Zone (TZ) updates during the Extended Support phase. DST or TZ updates are important because unless...
  • Blog Post: Notice: A hotfix is available to update the Daylight Saving Time for the “(UTC) Casablanca” time zone for Windows Operating Systems

    Morocco will observe daylight saving time in 2010. Microsoft has produced a hotfix to implement this change. If interested in downloading this hotfix, please refer to KB 982615 titled: "A hotfix is available to update the Daylight Saving Time for the "(UTC) Casablanca" time zone for Windows Operating...
  • Blog Post: Announcement: Microsoft Windows 2009 Daylight Saving Time and Time Zones Hotfix available for Egypt, Western Australia

    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...
  • Blog Post: Hotfix Available for Fiji 2009/2010 Daylight Saving Time

    Fiji government has approved the re-introduction of daylight saving time in Fiji, from Sunday, November 29th 2009 at 2.00 am to Sunday, April 25th 2010 at 3.00 am. This hotfix updates the start and end of Daylight Savings Time (DST) for Fiji in 2009. Microsoft has produced a hotfix to implement...
  • Blog Post: Advisory: Syria decides to start daylight saving time on April 2nd, 2010

    The "Syrian News Station" reported that the Council of Ministers has decided that Syria will postpone DST start to April 2nd, 2010 (midnight between Thursday and Friday). Microsoft Windows provides a way to prevent machines from switching into DST by un-checking the “Automatically adjust the clock for...
  • Blog Post: Notice: Pakistan decides not to observe daylight saving time (DST) in the year 2010

    As reported on the Associated Press of Pakistan the government of Pakistan has decided that Pakistan will not observe DST in the year 2010. The existing setting for the Pakistan time zone in Microsoft Windows already reflects no DST for 2010. The display name for the Pakistan time zone is: “(UTC+05:00...
  • Blog Post: December 2013 DST Cumulative Update for Windows Operating Systems

    The December 2013 DST Cumulative Update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: Mid-Atlantic Time: The Mid-Atlantic time zone is deprecated in this update. Morocco Standard Time: Morocco extended the 2013 DST...
  • Blog Post: August 2013 DST Cumulative Update for Windows operating systems

    The August 2013 DST Cumulative Update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: Libya Standard Time: New DST starts on the last Friday of March at 2:00 A.M., and ends on the last Friday of October at 2:00 A.M. This new...
  • Blog Post: Microsoft Daylight Saving Time and Time Zone update now available (December 2008)

    The most recent cumulative updates to daylight saving time (DST) and world time zones (TZ) are now available for supported versions of the following products. For the latest DST updates on each of these products, please visit the following Microsoft Web site: Microsoft Daylight Saving Time Support page...
  • Blog Post: HOTFIX: Chile Extends 2013 DST

    The government of Chile has extended Daylight Saving Time for 2013 [ Official Decree ]. DST for mainland Chile now ends on April 27, 2013 and starts on September 7, 2013. A hotfix for Windows has been released to address this change. You can find details of the hotfix and download it here [ KB2821346...
  • Blog Post: October 2012 DST Cumulative Update for Windows operating systems

    The October 2012 DST Cumulative update for Windows operating systems has been published on Microsoft Download Center. This year’s October Update replaces the normal August Cumulative Update. It contains the following changes: E. Europe Standard Time: The display name for this time zone...
  • Blog Post: Advisory: Mauritius Discontinues Daylight Saving Time in 2009

    There will be no daylight saving time (DST) in Mauritius in 2009 despite positive reports from a recent DST trial, which began in October 2008 and ended in March 2009. Mauritius’ government announced that it would not repeat last year’s DST trial. Microsoft Windows provides a way to prevent machines...