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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
2011 Russian Changes
August 2011 Cumulative Update
Daylight Saving Time
Daylight Savings Time
Democratic People's Republic of Korea
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Microsoft Daylight Saving Time & Time Zone Blog
Cumulative Windows DST Update made available in December 2015
Microsoft released a cumulative Windows Update for all supported versions of Windows in December 2015 - KB3112148. The update contains all the DST changes that were released as hotfixes between August 2015 and December 2015. Please read the KB article for Windows 8.1 and below to get a detailed description...
5 Jan 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 People's Republic of Korea and Fiji. Details are as below: Turkey will end DST two weeks later than normal. Clocks will turn back one hour from 04:00 to 03:00 on Sunday, November 8, 2015. Democratic...
9 Oct 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 information on these adjustments, refer to this Microsoft Knowledge Base article : https://support.microsoft.com/en-us/kb/3077715 .
20 Aug 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 with UTC +8:30. Windows is currently investigating creating a new time zone to address this change, and the update as well as the change details will be available later this month or the beginning of September...
7 Aug 2015
Update for Morocco 2015 Ramadan End is Now Available
Please find the hotfix update to address Morocco 2015 Ramadan End scenario here: https://support.microsoft.com/en-us/kb/3062741.
22 Jun 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 Morocco. However, on Monday, 6/8 Morocco government officially announced this year's Ramadan period, which is different from the dates that KB 3062740 and KB 3062741 are based on. Unfortunately there...
10 Jun 2015
Upcoming Windows DST Update for Chile and Mexico
Microsoft is preparing update to address recent time zone data changes in Chile and Mexico. Details are as below: Chile will remain in DST from this year on, thus its UTC offset will be updated to UTC-3:00, display name of time zone "Pacific SA Standard Time" will be updated to "(UTC...
6 Feb 2015
December 2014 DST Cumulative Update for Windows Operating Systems
The December 2014 DST Cumulative Update for Windows Operating Systems is now available. It contains the following changes: Russia time zones Russia has changed its existing time zones on October 26, 2014. This change included seven updated time zones, three new time zones, and two existing time...
9 Dec 2014
Update for Fiji DST change 2014 is available now
Pleas download the hotfix package from here: http://support.microsoft.com/kb/3011843
30 Oct 2014
Fiji DST Change for 2014
Fiji government announced on Oct. 20th, 2014 that Fiji will enter DST on November 2nd, 2014 till Jan 18th, 2015 ( link ). While Microsoft is preparing a Hotfix to address this change, below are temporary solutions that users who are impacted by this change should take before Oct 26th, 2014, when Windows...
24 Oct 2014
Update for Russian Time Zone Changes is Now Available
Please visit http://support.microsoft.com/kb/2998527 for the update details.
24 Sep 2014
Announcement: Update for Russian Time Zone Changes
According to a recent law [ link ] passed by the government of Russia, Russia will change its existing time zones on October 26, 2014. Microsoft is planning to release an update for Windows on September 23, 2014 to address this change, with details below: 1. Update 7 existing time zones to match...
22 Aug 2014
August 2014 DST Cumulative Update for Windows Operating Systems
The August 2014 DST Cumulative Update for Windows Operating Systems has been published on Microsoft Download Center. It contains the following changes: Jordan Standard Time: For 2014 and onward, Jordan has changed its DST Start time from the last Thursday in March at midnight to the last Friday...
12 Aug 2014
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...
24 Jul 2014
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...
24 Jul 2014
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 ...
18 Mar 2014
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...
7 Mar 2012
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...
23 Nov 2011
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...
18 Apr 2009
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...
13 Sep 2011
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...
11 Dec 2009
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...
30 Mar 2010
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...
9 Dec 2013
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...
27 Nov 2012
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...
19 Oct 2011
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