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
DST Blog moved to new blog site
The DST blogs have been moved to a newer blog site...
Date: 02/07/2019
Timezone update for Qyzylorda, Kazakhstan
Microsoft is aware of the time zone change for Qyzylorda region of Kazakhstan. Qyzylorda will...
Date: 12/21/2018
Time zone updates for Kingdom of Morocco and Volgograd, Russia are available
The November 2018 update addresses Daylight Standard Time (DST) changes for the Kingdom of Morocco...
Date: 11/28/2018
Time zone update for Metlakatla, Alaska, USA
Microsoft is aware of the time zone change for the Metlakatla community in Alaska, USA. The citizens...
Date: 11/09/2018
Time zone update for the Kingdom of Morocco
Microsoft is aware of the upcoming time zone change for the Kingdom of Morocco. Morocco will remain...
Date: 10/26/2018
Time zone updates for Republic of Chile
Microsoft is aware of the following change in Daylight Saving Time (DST) for the Republic of Chile...
Date: 10/26/2018
DST update for Fiji is now available
The October 2018 Update addresses the DST changes for Fiji where the DST end date has been pulled in...
Date: 10/26/2018
Time zone updates for Volgograd Oblast, Russia
Microsoft is aware of the time zone change for Volgograd Oblast, Russia. Volgograd will permanently...
Date: 10/11/2018
Time Zone Updates for North Korea
Microsoft is aware of the following time zone change for which Windows Updates will be made...
Date: 05/04/2018
Windows Time data update for Brazil, Morocco, and São Tomé and Príncipe are now available
This update addresses the recently announced changes in Brazil, Morocco, and São Tomé and Príncipe....
Date: 04/24/2018
Windows Time Data Update for Namibia and Turks & Caicos now available
This update addresses the recently announced changes in the Republic of Namibia and the Turks &...
Date: 02/21/2018
Windows Time Data Updates for Morocco and Haiti is now available
As it has in previous years, Morocco suspended its daylight saving time (DST) period for the...
Date: 06/27/2017
Windows Time Data Updates for Morocco DST is now available
As it has in previous years, Morocco is suspending its daylight saving time (DST) period for the...
Date: 05/18/2017
Windows Time Data Updates for Magallanes (Chile) is now available
This update addresses the recent time zone changes in Magallanes region of Chile. Windows 10...
Date: 04/18/2017
Windows Time Data Updates for Tonga, Northern Cypress, Mongolia and Saratov (Russia) is now available
This update addresses the recent time zone changes in Tonga, Mongolia, Northern Cypress and Russian...
Date: 03/21/2017
Time Zone Updates for Magallanes (Chile) and Haiti
The government of Chile recently announced that the Magallanes Region and Chilean Arctic will stay...
Date: 03/15/2017
Time Zone Updates for Mongolia
The Mongolian government recently announced that they will not be observing DST going forward. DST...
Date: 02/13/2017
Time Zone Updates for Tonga
Microsoft has received official decree verifying that Tonga will start observing DST on November 6,...
Date: 10/28/2016
Time data update for Turkey is now available for Windows 8.1 and below
This addresses the recent DST changes announced by the Turkish government. Please visit the KB...
Date: 10/18/2016
Windows Time Data Updates for Turkey is now available for Windows 10
Windows 10 customers are recommended to install the latest cumulative update listed in our update...
Date: 10/11/2016
Windows Time Data Updates for Novosibirsk is now available
Please visit the KB article for more details on this update for Windows 8.1, Server 2012 R2 and...
Date: 09/22/2016
Time Zone Updates for Turkey
The Turkish government recently announced that they will not be observing DST going forward. They...
Date: 09/19/2016
Windows Time Data Update for Egypt DST change now available
Please visit the KB article for more details on this update for Windows 8.1, Server 2012 R2 and...
Date: 08/16/2016
Time Zone Updates for Novosibirsk, Russia
The Russian government recently announced that the Novosibirsk region will be moving from UTC +06:00...
Date: 07/12/2016
Time Zone Updates for Egypt: DST Cancellation
The government of Egypt recently canceled DST permanently. DST was previously scheduled to begin on...
Date: 07/06/2016
Windows Time Data Update for June 2016 now available
Please visit the KB article for more details on this update for Windows 8.1, Server 2012 R2 and...
Date: 06/15/2016
Windows Update now available for Azerbaijan, Chile and Haiti time zone changes
Please visit the KB article for more details on this update for Windows 8.1, Server 2012 R2 and...
Date: 05/20/2016
Time Zone Updates for Egypt
The Egyptian government recently announced that they will be observing DST from Friday, July 8th,...
Date: 05/20/2016
Time Zone Update for Tomsk, Russia
The Russian government recently announced that the Tomsk region will be moving from UTC +06:00 to...
Date: 05/10/2016
Time Zone Updates for Venezuela
The government of Venezuela recently announced that they will be advancing their clocks forward by...
Date: 04/20/2016
Time Zone Updates for Magadan Oblast, Russia
The Russian government recently announced that Magadan Oblast will be moving from UTC +10:00 hours...
Date: 04/11/2016
Time Zone Update for Chile and Haiti
The government of Chile recently announced that they will be returning to standard time this year....
Date: 03/23/2016
Time Zone Update for Azerbaijan
The government of Azerbaijan recently announced that they will not be observing DST this year. DST...
Date: 03/22/2016
Time Zone Updates for Russia
In accordance with recently passed Russian law, the following regions in Russia will switch time...
Date: 03/15/2016
Cumulative Windows DST Update made available in December 2015
Microsoft released a cumulative Windows Update for all supported versions of Windows in December...
Date: 01/04/2016
Upcoming Windows DST Update for Turkey, Democratic People's Republic of Korea and Fiji
Microsoft is preparing an update to address recent time zone data changes in Turkey, Democratic...
Date: 10/09/2015
August 2015 Cumulative Update for Windows Operating Systems is now availabe
The August 2015 DST Cumulative Update for Windows Operating Systems is now available. For more...
Date: 08/20/2015
Upcoming Windows DST Update for Democratic People's Republic of Korea
Democratic People's Republic of Korea just announced that it will implement its own time zone...
Date: 08/07/2015
Update for Morocco 2015 Ramadan End is Now Available
Please find the hotfix update to address Morocco 2015 Ramadan End scenario here:...
Date: 06/22/2015
[Updated] Prepare for 2015 Morocco Ramadan DST Change
KB 3062740 and KB 3062741 were released last month to address this year's Ramadan DST change in...
Date: 06/10/2015
Update for Mexico, Mongolia and Iran DST change is now available
Please download the update from https://support.microsoft.com/en-us/kb/3049874/.
Date: 03/25/2015
Upcoming Windows DST Updates for Mexico, Mongolia and Iran
Microsoft is preparing an update to address recent time zone data changes in Mongolia, and correct...
Date: 03/18/2015