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 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: Update available for Brazil, Fiji and Jordan time zones

    This time zone update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: Jordan: Jordan announced last year that, on December 20, 2013, it would no longer use the daylight saving time (DST) schedule that it observed in 2012 and 2013...
  • Blog Post: Notice: Ramadan Exception for Morocco DST

    As stated in the previous blog post , Microsoft has issued updates for Morocco introducing Daylight Saving Time in 2012 [ KB2698707 ]. Daylight time will be paused during the holy month of Ramadan. Due to the yearly fluctuation of the start and end dates of Ramadan during this time of year, it...
  • 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: 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: 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: 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: 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: 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: 2012 DST changes for Morocco

    According to a recent law [ link ] passed by the government of Morocco, Morocco will follow DST each year from 2012. Microsoft is releasing a series of updates for Windows to address this change. You can find details of the updates, including order of installation here: [KB2698707] Note: All systems...
  • Blog Post: HOTFIX: Paraguay Shortens 2012-13 DST

    The government of Paraguay has Shortened Daylight Saving Time for 2012-13 [ Official Decree ]. DST for Paraguay now ends on March 23, 2013. A hotfix for Windows has been released to address this change. You can find details of the hotfix and download it here [ KB2829069 ]. Hotfixes are available for...
  • Blog Post: August 2011 DST Cumulative Update for Windows operating systems

    The August 2011 DST Cumulative Update for Windows operating systems contains the following changes : NewFoundland : Newfoundland’s DST start and end times have been updated to 2AM from 12:01 AM. The rest of the Newfoundland time zone schedule is unchanged. Russian Time Zones ...