Daylight Saving Time & Time Zone Blog articles

Interim guidance for Egypt DST changes 2026

Naveen_Shankar — Fri, 17 Apr 2026 11:06:42 GMT

On April 24, 2026, Egypt will be observing DST changes. Earlier this month, Microsoft has identified an issue that affects Daylight Saving Time (DST) in Egypt between April 24 and April 30, 2026, inclusive of both dates. Calendar events and meeting times in Egypt will appear off by one hour for only certain Windows versions for the above-mentioned period.

This is due to a calendar edge case: a five-week April in 2026. Certain Windows versions apply Egypt’s DST change on the last Thursday of April (April 30, 2026) instead of the officially mandated transition on April 24, 2026. Therefore, Egypt DST enforcement might be delayed by one week with a manual workaround available. Clocks will be correctly set to Egypt DST time zone on May 1, 2026 without any further intervention.

The following platforms are impacted:

Windows Server 2016
This issue doesn’t impact any other in-support versions of Windows.

The impact of this change on the affected platforms is as follows:

Clocks will not be advanced by an hour at 12:00 a.m. on April 24, 2026, for the Egypt time zone until 12:00 a.m. on May 1, 2026.
Clocks will be automatically advanced by an hour at 12:00 a.m. on May 01, 2026, for the Egypt time zone.

Interim guidance

In the meantime, we recommend that affected organizations with devices in Egypt use the following workaround. For enterprise bulk management of this workaround, please contact Microsoft Customer Support.

Verify whether your device is affected by this issue

Select the Windows logo key, type "Date and time", and select Date and time settings.
If the date shown is April 24, 2026, then your device is unaffected. No further action is needed.
Your device is affected if the Date and Time dialog box shows May 1, 2026 as the beginning of DST (reference picture attached below)

Manually update the registry key to set up Egypt time zone on the devices

For affected devices, you can choose a temporary workaround. Manually update the registry key as follows.

Open the command prompt as administrator and run the following command:
reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Egypt Standard Time\Dynamic DST" /v LastEntry
Verify whether LastEntry is 0x7e7 (2023). If LastEntry is missing or different, please do not proceed. Wait for the May 2026 Windows security update or contact CSS.

Sample Output:

3. Optional Step: Create a backup before overwriting the settings with the fix.

- Run the following command to create backup: reg export "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Egypt Standard Time\Dynamic DST" "%USERPROFILE%\Desktop\EgyptDST_backup.reg" /y

Apply Fix:

Apply the fix through the following command.
reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones\Egypt Standard Time\Dynamic DST" /v 2023 /t REG_BINARY /d 88FFFFFF00000000C4FFFFFF00000A000400050017003B003B00E70300000400050005000000000000000000
Then type Y when prompted to overwrite.

Output:

Verify the Fix:

Check Date and time settings to confirm that the temporary fix is applied. Select the Windows logo key, type "Date and time", and select Date and time settings. The notice should now say that DST begins on April 24, 2026.

On May 1, 2026, all in-support systems will show the correct Egypt DST time automatically. Even if you apply the temporary workaround, no action is needed after this date.

For additional information, please review our official policy page and How Windows manages time zone changes.

Chile 2025 Time Zone update available now

Naveen_Shankar — Thu, 10 Apr 2025 03:45:36 GMT

On March 20, 2025, the Chile government made an official announcement that the Aysén Region in Chile would permanently stay in Daylight Saving Time (DST) or UTC-3.

The impact of this change is as follows:

Clocks will not advance by 60 minutes at 12:00 A.M. (midnight) on April 6, 2025, for the Chile Aysén Region time zone
The Chile Aysén Region time zone will shift to the new time zone America/Coyhaique at UTC-3 for the foreseeable future and will be referred to as Magallanes Standard Time year-round

Microsoft is releasing the below Windows updates in support of this decision. This change is available in the April 2025 Security monthly update, released on April 8, 2025, for all the below listed versions of Windows.  

All Windows updates containing this fix have the following release note text: 

“Update for the Aysen region in Chile to support the government DST change order in 2025"

The KB article numbers that support this change are listed below:

Product	KB Article ID
Windows 11, version 24H2	KB5055523
Windows 11, version 23H2	KB5055528
Windows 11, version 22H2	KB5055528
Windows 10, version 22H2	KB5055518
Windows Server 23H2	KB5055527
Windows Server 2022	KB5055526
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5055519
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5055521
Windows 10 TH1	KB5055547
Windows 8.1	KB5055557

All remaining supported Windows versions will have to manually set a new time zone setting to “(UTC-3) Punta Arenas” on April 6, 2025, at 12:00 A.M. (midnight). Please visit Interim guidance for Chile DST changes 2025 for an earlier announcement of this change and more details on how to set a new time zone.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Interim guidance for Chile DST changes 2025

Naveen_Shankar — Thu, 10 Apr 2025 04:06:30 GMT

Editor’s note 4.08.2025: Microsoft has released all Windows updates applicable to address Chile time zone changes in 2025.04 B Security Update. Here's a new post published about it: Chile 2025 Time Zone update available now

On March 20, 2025, the Chile government made an official announcement that the Aysén Region in Chile would permanently stay in Daylight Saving Time (DST) or UTC-3.

The impact of this change is as follows:

Clocks will not advance by 60 minutes at 12:00 A.M. (midnight) on April 6, 2025, for the Chile Aysén Region time zone
The Chile Aysén Region time zone will shift to the new time zone America/Coyhaique at UTC-3 for the foreseeable future and will be referred to as Magallanes Standard Time year-round

Microsoft plans to release an update to support this change. However, we require sufficient time to properly build, test, and release such an update for all platforms before the change goes into effect. See How Windows manages time zone changes to better understand the complexities of this process.

The following platforms will receive an update to support this time zone change as part of the April 2025 Windows security update:

Windows 11, version 24H2
Windows Server 23H2
Windows 11, version 22H2 and version 23H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB

For Devices on remaining versions of Windows i.e., Windows Server 2012, Windows 7 SP1, Windows Server 2008 R2 SP1, and Windows Server 2008 SP2 - will have to manually set a new time zone setting to “(UTC-3) Punta Arenas” on April 6, 2025, at 12:00 A.M. (midnight).

Interim guidance

Starting on April 6,12:00 AM and until you take the April 2025 Windows security update, we recommend that affected organizations with devices in the Chile Aysén Region use the following workaround: set a different time zone to reflect the correct local time.

Important

Regardless of April 2025 Windows Security Update, this is a required step for devices on the following versions: Windows Server 2012, Windows 7 SP1, Windows Server 2008 R2 SP1, and Windows Server 2008 SP2 to sync to correct time settings.

Set a new time zone on the devices

Microsoft recommends that users set the time zone on their devices to “(UTC-3) Punta Arenas” on April 6, 2025, at 12:00 A.M. (midnight). Selecting this time zone will ensure that devices reflect the correct local time, i.e., Magallanes Standard time. (Note: Events that have occurred in the past, before the update, will not show correctly.)

This can be done in one of the two ways:

Select the Windows logo key, type "time zone", and select Change the time zone. From the time zone dropdown, select “(UTC-3) Punta Arenas”.
Navigate to Control Panel > Date and Time > Change time zone. From the time zone dropdown, select “(UTC-3) Punta Arenas”. Select OK to apply the change.

For additional information, please review our official policy page and How Windows manages time zone changes

Paraguay 2025 time zone update now available

Naveen_Shankar — Thu, 13 Mar 2025 04:51:58 GMT

On October 14, 2024, the Paraguay government made an official announcement that Paraguay will permanently stay in Daylight Saving Time (DST) or UTC-3.  

The impact of this change is as follows: 

Clocks will not advance by 60 minutes at 12:00 AM on March 23, 2025, for the Paraguay time zone.

Paraguay will permanently stay at UTC-3 and will be referred to as Paraguay Time (PYT) all year.

Microsoft is releasing the below Windows updates in support of this decision. This change is available in the February 2025 non-security preview update, released on February 25, 2025, for the newer versions of Windows 10 and 11. All other supported Windows versions will receive the update as part of the next monthly quality update scheduled for release on March 11, 2025. 

All Windows updates containing this fix have the following release note text: 

“This update supports (DST) changes in Paraguay."

The KB article numbers that support this change are listed below:

Product	KB Article ID
Windows 11, version 24H2	KB5052093
Windows 11, version 23H2	KB 5052094
Windows 11, version 22H2	KB 5052094
Windows 10, version 22H2	KB 5052077
Windows Server 23H2	KB5053599
Windows Server 2022	KB5053603
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5053596
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5053594
Windows 10 TH1	KB5053618
Windows 8.1	KB5053887
Windows Server 2012	KB5053886
Windows 7 SP1	KB5053620
Windows Server 2008 SP2	KB5053888

Visit Interim guidance for Paraguay time zone changes 2025 for an earlier announcement of this change.

Interim guidance for Paraguay time zone changes 2025

Naveen_Shankar — Thu, 13 Mar 2025 04:57:22 GMT

Editor’s note 3.11.2025: Microsoft has released all Windows updates necessary to address these changes. We have updated the table below and published a new post: Paraguay-2025-time-zone-update-now-available

On October 14, 2024, the Paraguay government made an official announcement that Paraguay will permanently stay in Daylight Saving Time (DST) or UTC-3.

The impact of this change is as follows:

Clocks will not advance by 60 minutes at 12:00 AM on March 23, 2025, for the Paraguay time zone.

Paraguay will permanently stay at UTC-3 and will be referred to as Paraguay Time (PYT) all year.

The following platforms will receive an update to support this time zone change as part of the February 2025 non-security update:

Windows 11, version 24H2

Windows 11, version 23H2

Windows 11, version 22H2

Windows 10, version 22H2

Remaining versions of Windows will receive the update as part of the March 2025 monthly quality update.

For additional information, please review our official policy page and How Windows manages time zone changes.

Samoa 2021 time zone update now available.

AshishNawal — Tue, 09 Apr 2024 19:22:15 GMT

Samoa observes West Samoa Time (WST), 13 hours ahead of UTC (UTC+13). The government of Samoa implemented support for Daylight Savings Time (DST) in 2010.

Eleven years later, on September 15, 2021, the Samoa government cabinet announced its intent to stop observing Daylight Saving Time on September 20, 2021.

The impact of this change is as follows:

Samoa observes the UTC+13 time zone throughout the year, and the DST is completely abolished for the country.

Microsoft is releasing the below Windows updates in support of this decision. This change is available in the March 2024 non-security preview update, released on March 26, 2024, for the newer versions of Windows 10 and 11. All other supported Windows versions will receive the update as part of the next monthly quality update scheduled for release on April 9, 2024.

All Windows updates containing this fix have the following release note text:

“This update includes changes to Samoa daylight saving time (DST). “

The KB article numbers that support this change are listed below:

Product	KB Article ID
Windows 11, version 22H2	KB5035942
Windows 10, version 22H2; Windows 10, version 21H2	KB5035941
Windows 11, version 21H2	KB5036894
Windows Server 2022	KB5036909
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5036896
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5036899
Windows 10 Enterprise 2015 LTSB	KB5036925
Windows Server 2012	KB5036960

Visit Interim guidance for Samoa DST changes 2021 for an earlier announcement of this change.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Palestine Authority 2024 time zone update now available.

AshishNawal — Tue, 09 Apr 2024 19:22:18 GMT

The Palestinian Authority has decided to delay the start of Daylight-Saving Time (DST) in 2024 and 2025. The Ministry of Communications and Information Technology of the Palestinian Authority has conveyed this decision in an article dated January 30, 2024.

This moves the DST entry date further away from and the Eid ul Fitr holiday, which marks the end of Ramadan.

The Palestinian Authority also announced that the 2025 DST date will be delayed by one week.

The impact of this change is as follows:

Clocks will be set forward 1 hour on Saturday, April 20, 2024, from 2:00 AM to 3:00 AM local time.
Clocks will be set back 1 hour on Saturday, October 26, 2024, from 2:00 AM to 1:00 AM local time.

All Windows updates containing this fix have the following release note text:

“This update includes changes to Palestine authority daylight saving time (DST).”

The KB article numbers that support this change are listed below:

Product	KB Article ID
Windows 11, version 22H2	KB5035942
Windows 10, version 22H2; Windows 10, version 21H2	KB5035941
Windows 11, version 21H2	KB5036894
Windows Server 2022	KB5036909
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5036896
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5036899
Windows 10 Enterprise 2015 LTSB	KB5036925
Windows Server 2012	KB5036960

Visit Interim guidance for DST changes announced by Palestinian Authority for 2024, 2025 for an earlier announcement of this change.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Kazakhstan 2024 time zone update now available

AshishNawal — Tue, 09 Apr 2024 19:22:21 GMT

On December 7, 2023, the Kazakh Ministry of Trade and Integration proposed that Kazakhstan switch to a single time zone in 2024. Specifically, Kazakhstan would uniformly apply the fifth time zone (UTC+5) across its entire territory. Prior to March 1, 2024, Kazakhstan used two time zones: UTC+5 and UTC+6.

Based on the government article published on January 29, 2024, it appears that the DST time change was approved.

The impact of this change is that, as of March 1, 2024, the following turned back the local time by one hour:

The cities of Astana, Almaty, and Shymkent.
The regions of Abai, Akmola, Almaty, Zhambyl, Zhetisu, Karagandy, Kostanai, Pavlodar, North Kazakhstan, Turkistan, Ulytau, and East Kazakhstan.

Microsoft is releasing the below Windows updates in support of this decision. This change is available in the March 2024 non-security preview update, released on March 26, 2024 for the newer versions of Windows 10 and 11. All other supported Windows versions will receive the update as part of the next monthly quality update scheduled for release on April 9 , 2024.

All Windows updates containing this fix have the following release note text:

“This update includes changes to Kazakhstan daylight saving time (DST)"

The KB article numbers that support this change are listed below:

Product	KB Article ID
Windows 11, version 22H2	KB5035942
Windows 10, version 22H2; Windows 10, version 21H2	KB5035941
Windows 11, version 21H2	KB5036894
Windows Server 2022	KB5036909
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5036896
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5036899
Windows 10 Enterprise 2015 LTSB	KB5036925
Windows Server 2012	KB5036960

Visit Interim guidance for Kazakhstan time zone changes 2024 for an earlier announcement of this change.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Interim guidance for DST changes announced by Palestinian Authority for 2024, 2025.

AshishNawal — Tue, 09 Apr 2024 19:26:28 GMT

Editor’s note 4.9.2024: Microsoft has released all Windows updates necessary to address these changes. We have updated the table below and published a new post: Palestine Authority 2024 time zone update now available

The Palestinian Authority has decided to delay the start of Daylight Saving Time (DST) in 2024 and 2025. The Ministry of Communications and Information Technology of the Palestinian Authority has conveyed this decision in an article dated January 30, 2024.

This moves the DST entry date further away from the month of Ramadan and the Eid ul Fitr holiday, which marks the end of Ramadan.

The Palestinian Authority also announced that the 2025 DST date will be delayed by one week.

The impact of this change is as follows:

Clocks will be set forward 1 hour on Saturday, April 20, 2024, from 02:00 AM to 03:00 AM local time.

Clocks will be set back 1 hour on Saturday, October 26, 2024, from 02:00 AM to 01:00 AM local time.

The following platforms will receive an update to support this time zone change as part of the March 2024 non-security preview update or the April 2024 security update:

Windows Server 23H2
Windows 11, version 22H2 and version 23H2
Windows 11, version 21H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB
Windows Server 2012
Windows Server 2008 SP2
Windows 8.1
Windows 7.0 SP1

For additional information, please review our official policy page and How Windows manages time zone changes.

Interim guidance for Samoa DST changes 2021

AshishNawal — Tue, 09 Apr 2024 19:27:12 GMT

Editor’s note 4.9.2024: Microsoft has released all Windows updates necessary to address these changes. We have updated the table below and published a new post: Samoa 2021 time zone update now available

Samoa observes West Samoa Time (WST), 13 hours ahead of UTC (UTC+13). The government of Samoa implemented support for Daylight Savings Time (DST) in 2010

Eleven years later, on September 15, 2021, the Samoa government cabinet announced its intent to stop observing Daylight Saving Time on September 20, 2021.

The impact of this change is as follows:

Samoa observes the UTC+13 time zone throughout the year, and the DST is completely abolished for the country.

The following platforms will receive an update to support this time zone change as part of the March 2024 non-security preview update or the April 2024 security update:

Windows Server 23H2
Windows 11, version 22H2 and version 23H2
Windows 11, version 21H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB
Windows Server 2012
Windows Server 2008 SP2
Windows 8.1
Windows 7.0 SP1

Interim guidance

We recommend that affected organizations with devices in Samoa use the following workarounds till April 9, 2024: temporarily disable automatic DST adjustments in Windows and/or set a different time zone to reflect the correct local time.

Temporarily disable automatic DST adjustments in Windows

Temporarily disable automatic DST adjustments in Windows to reflect the correct local time, until April 9, 2024.

This can be done in one of the two ways:

Select the Windows logo key, type "Date and time," and select Date and time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to Off.
Go to Control Panel > Clock and Region > Date and Time > Change time zone and uncheck the option for “Automatically adjust clock for Daylight Saving Time.”

Re-enable automatic DST adjustments in Windows

After 10:00 A.M. on April 9, 2024, re-enable automatic DST adjustments and ensure accurate time switching with future DST transitions.

This can be done in one of the two ways:

Select the Windows logo key, type "Date and time," and select Date and time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to On.
Go to Control Panel > Clock and Region > Date and Time > Change time zone and check the option for “Automatically adjust clock for Daylight Saving Time.”

Temporarily set a different time zone on the devices

Microsoft recommends that users temporarily set the time zone on their devices to (UTC+13) Samoa. Selecting this time zone will ensure that devices reflect the correct local time. (Note: events that have occurred in the past, before the update, will not show correctly.)

This can be done in one of the two ways:

Select the Windows logo key, type "time zone," and select Change the time zone. From the time zone dropdown, select (UTC+13) Samoa.
Navigate to Control Panel > Date and Time > Change time zone. From the time zone dropdown, select (UTC+13) Samoa. Select OK to apply the change.

For additional information, please review our official policy page and How Windows manages time zone changes.

Interim guidance for Kazakhstan time zone changes 2024.

AshishNawal — Tue, 09 Apr 2024 19:28:17 GMT

Editor’s note 4.9.2024: Microsoft has released all Windows updates necessary to address these changes. We have updated the table below and published a new post: Kazakhstan 2024 time zone update now available

On December 7, 2023, the Kazakh Ministry of Trade and Integration proposed that Kazakhstan switch to single time zone in 2024. Specifically, Kazakhstan would uniformly apply the fifth time zone (UTC+5) across its entire territory.

Based on the government article published on January 29, 2024, it appears that the DST time change was approved.

Prior to March 1, 2024, Kazakhstan used two time zones: UTC+5 and UTC+6.

The impact of this change is as follows:

On March 1, 2024, the cities of Astana, Almaty, and Shymkent, as well as the following regions will turn back the local time by one hour: Abai, Akmola, Almaty, Zhambyl, Zhetisu, Karagandy, Kostanai, Pavlodar, North Kazakhstan, Turkistan, Ulytau, and East Kazakhstan.

The following platforms will receive an update to support this time zone change as part of the March 2024 non-security preview update or the April 2024 security update:

Windows Server 23H2
Windows 11, version 22H2 and version 23H2
Windows 11, version 21H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB

Interim guidance

We recommend that affected organizations with devices in Kazakhstan use the following workarounds between March 1 and April 9, 2024: temporarily disable automatic time adjustments in Windows and/or set a different time zone to reflect the correct local time.

Temporarily disable automatic time adjustments in Windows

Temporarily disable automatic time adjustments in Windows to reflect the correct local time between March 1 and April 9, 2024.

This can be done in the following way:

Go to Control Panel > Time and language > Date and Time > and uncheck the option for “Set time zone automatically.”

Re-enable automatic time adjustments in Windows.

After 10:00 A.M. on April 9, 2024, re-enable automatic time zone adjustments and ensure accurate time switching with future transitions.

This can be done in the following way:

Go to Control Panel > Time and language > Date and Time > and check the option for “Set time zone automatically.”

Temporarily set a different time zone on the devices

Microsoft recommends that users temporarily set the time zone on their devices to (UTC+5) Qyzylorda. Selecting this time zone will ensure that devices reflect the correct local time. (Note: events that have occurred in the past, before the update, will not show correctly.)

This can be done in the following way:

Navigate to Control Panel > Time and language > Date and Time. From the time zone dropdown, select (UTC+5) Qyzylorda. Select OK to apply the change.

For additional information, please review our official policy page and How Windows manages time zone change.

Syria 2022 time zone update now available

AshishNawal — Tue, 21 Nov 2023 12:46:47 GMT

By the order of the government of Syria, in October 2022, a new law was passed on the determination of time in the country. Based on that:

Since October 2022, Syria has observed the UTC+3 time, which is the country’s new standard time.
Late October 2023: Windows non-security preview release includes the update to address this time change for Windows 11 and Windows 10, version 22H2.
November 14, 2023: Windows monthly quality release will include the update to address this time change for all supported versions of Windows.

Microsoft is releasing the following Windows updates in support of this decision. This change is available in the October 2023 non-security preview update, released on 26th October 2023 for the newer versions of Windows 10 and 11. All other supported Windows versions will receive the update as part of the next monthly quality update scheduled to release on November 14, 2023.

All Windows updates containing this fix have the following release note text:

This update includes changes to Syria daylight saving time (DST).

The KB article numbers that support the Syria DST change are listed below:

Product	KB Article ID
Windows 11, version 22H2	KB5031455
Windows 10, version 22H2; Windows 10, version 21H2	KB5031445
Windows 11, version 21H2	KB5032192
Windows Server 2022	KB5032198
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5032196
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5032197
Windows 10 Enterprise 2015 LTSB	KB5032199
Windows Server 2012	KB5032249
Windows Server 2008 SP2	KB5032248
Windows 7.0 SP1	KB5032250 KB5032252

Visit Interim guidance for Syria DST changes 2022 for an earlier announcement of this change.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Greenland 2023 time zone update now available

AshishNawal — Wed, 11 Oct 2023 11:33:44 GMT

By the order of the government of Greenland, a new law has been passed on the determination of time in the country. The law stipulates that:

Greenland's standard time will be UTC-2 from 25 March 2023, instead of UTC-3.
Greenland will not switch to Daylight Saving Time this year, 2023, as the standard time for Greenland will change from UTC-3 to UTC-2.
Greenland will change to Daylight Saving Time again in 2024 and onwards.

How these time changes will be reflected, can also be understood from the table below:

Year	Standard time for Greenland	Daylight Saving Time
2022	UTC-3	UTC-2
2023	UTC-3 (Jan – Mar) \| UTC-2 (Oct – Dec)	UTC-2 (Mar – Oct)
2024	UTC-2	UTC-1 (Mar – Oct)
2025	UTC-2	UTC-1 (Mar – Oct)
And so on.	UTC-2	UTC-1 (Mar – Oct)

Microsoft is releasing the following Windows updates in support of this decision. This change is available in the September 2023 non-security preview update released in late September 2023 for the 20H2 and newer versions of Windows 10 and 11. All other supported Windows versions will receive the update as part of the next monthly quality update scheduled to release on October 10, 2023.

All Windows updates containing this fix have the following release note text:

This update includes changes to Greenland daylight saving time (DST).

The KB article numbers that support the Greenland DST change are listed below:

Product	KB Article ID
Windows 11, version 22H2	KB5030310
Windows 11, version 21H2	KB5030301
Windows 10, version 22H2; Windows 10, version 21H2	KB5030300
Windows Server 2022	KB5031364
Windows 10 Enterprise LTSC 2019; Windows Server 2019	KB5031361
Windows 10 Enterprise LTSC 2016; Windows Server 2016	KB5031362
Windows 10 Enterprise 2015 LTSB	KB5031377
Windows Server 2012	KB5031419 KB5031407
Windows Server 2008 SP2	KB5031416 KB5031 411
Windows 7.0 SP1	KB5031408 KB5031441

A minor known issue in the historical message string shown in the “Date and time” app might affect a few users. The Daylight-Saving Time for the period of January 1, 2023, to March 31, 2023, will show incorrectly on the app’s message string (marked in red below) but will not affect any application's time display, real or historical data.

Screenshot of the Date and Time app showing a historical DST message for Greenland.

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Interim guidance for Syria DST changes 2022.

AshishNawal — Mon, 11 Sep 2023 11:41:39 GMT

On October 5, 2022, the Syrian government made an official announcement about a Daylight-Saving Time (DST) time zone change. Since then, the official time has not advanced by an hour and has permanently shifted to the UTC+3 time zone.

The impact of this change is as follows:

Since October 2022, Syria has observed the UTC+3 time, which is the country’s new standard time.
Late October 2023: Windows non-security preview release will include the update to address this time change for Windows 11 and Windows 10, version 22H2.
November 14, 2023: Windows monthly quality release will include the update to address this time change for all supported versions of Windows.

The following platforms will receive an update to support this time zone change as part of October 2023 quality update or the November 2023 security update:

Windows 11, version 22H2
Windows 11, version 21H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB
Windows Server 2012
Windows Server 2008 SP2
Windows 8.1
Windows 7.0 SP1

Interim guidance

In the meantime, we recommend that affected organizations with devices in Syria use the following workarounds: temporarily disable automatic DST adjustments in Windows and/or set a different time zone to reflect the correct local time.

Temporarily disable automatic DST adjustments in Windows

Temporarily disable automatic DST adjustments in Windows to reflect the correct local time between September 03, 2023, and November 14, 2023.

This can be done in one of the two ways:

Select the Windows logo key, type "Date and time", and select Date and time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to Off.
Go to Control Panel > Clock and Region > Date and Time > Change time zone and uncheck the option for “Automatically adjust clock for Daylight Saving Time”.

Re-enable automatic DST adjustments in Windows.

For those in the Syria time zone, after 10:00 A.M. on November 14, 2023, re-enable automatic DST adjustments and ensure accurate time switching with future DST transitions.

This can be done in one of the two ways:

Select the Windows logo key, type "Date and time", and select Date and time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to On.
Go to Control Panel > Clock and Region > Date and Time > Change time zone and check the option for “Automatically adjust clock for Daylight Saving Time”.

Temporarily set a different time zone on the devices

Microsoft recommends that users temporarily set the time zone on their devices to “(UTC+3) Amman”. Selecting this time zone will ensure that devices reflect the correct local time. (Note: events that have occurred in the past, before the update, will not show correctly.)

This can be done in one of the two ways:

Select the Windows logo key, type "time zone", and select Change the time zone. From the time zone dropdown, select “(UTC+3) Amman”.
Navigate to Control Panel > Date and Time > Change time zone. From the time zone dropdown, select “(UTC+3) Amman”. Select OK to apply the change.

For additional information, please review our official policy page and How Windows manages time zone changes.

Interim guidance for Greenland DST changes 2023

AshishNawal — Sun, 03 Sep 2023 13:08:45 GMT

On November 27, 2022, the Greenland government made an official announcement about a Daylight-Saving Time (DST) time zone change. The country will not switch to Daylight Saving Time. Instead, Greenland’s standard time will permanently shift to UTC-2, which is the same time that has been observed since March 25, 2023. In 2024, Greenland will resume annual Daylight-Saving Time between March and October by temporarily shifting from UTC-2 to UTC-1.

The impact of this change is as follows:

Since March 25, 2023, Greenland has observed the UTC-2 time, which is the country’s new standard time.
Late September 2023: Windows non-security preview release will include the update to address this time change for Windows 11 and Windows 10, version 22H2.
October 10, 2023: Windows monthly quality release will include the update to address this time change for all supported versions of Windows.
March-October 2024: Greenland will temporarily shift to UTC-1 to observe the new annual Daylight-Saving Time. Devices updated with the September/October 2023 updates will reflect these changes automatically.

How these time changes will be reflected, can also be understood from the table below:

Year	Standard time for Greenland	Daylight Saving Time
2022	UTC-3	UTC-2
2023	UTC-3 (Jan – Mar) \| UTC-2 (Oct – Dec)	UTC-2 (Mar – Oct)
2024	UTC-2	UTC-1 (Mar – Oct)
2025	UTC-2	UTC-1 (Mar – Oct)
And so, on	UTC-2	UTC-1 (Mar – Oct)

The following platforms will receive an update to support this time zone change as part of September 2023 quality update or the October 2023 security update:

Windows 11, version 22H2
Windows 11, version 21H2
Windows 10, version 22H2; Windows 10, version 21H2
Windows Server 2022
Windows 10 Enterprise LTSC 2019; Windows Server 2019
Windows 10 Enterprise LTSC 2016; Windows Server 2016
Windows 10 Enterprise 2015 LTSB
Windows Server 2012
Windows Server 2008 SP2
Windows 8.1
Windows 7.0 SP1

For additional information, please review our official policy page and How Windows manages time zone changes.

Israel 2024 time zone update now available

AshishNawal — Mon, 22 Jan 2024 11:04:37 GMT

Editor’s Note: 12.26.2023: We have updated this post to clarify the DST dates and what happens if the recommended updates are not installed.

In the month of May 2023, our internal Customer Support team reported an error, which was affecting Daylight Saving Time (DST) in Israel for events that were scheduled for March 2024 and onwards. This was resulting in the meeting times in Israel being off by one hour. On further investigation, it was realized that it was happening due to a missing registry in one of the internal systems.

To ensure that this issue is proactively resolved, Microsoft released the Windows updates listed below to account for the correct DST changes:

Daylight Saving Time in Israel will start on Friday, March 29, 2024 at 2:00:00 AM local standard time.

The clocks will be turned forward one hour to 3:00:00 AM local daylight time.

Daylight Saving Time in Israel will end on Sunday, October 27, 2024 at 2:00:00 AM local daylight time.

The clocks will be turned backward one hour to 1:00:00 AM local standard time.

This change is available in the August 2023 Cumulative Update preview released on August 22, 2023, for the 20H2 and the newer versions of Windows 10 and 11. All other supported Windows versions received the update as part of the September 2023 monthly quality update scheduled to release on September 12, 2023.

Note: If you don’t install these Windows updates released in August 2023 and September 2023, you will not see the correct time change schedule.

All Windows updates containing this fix have the following release note text:

Update for Israel DST Changes

The KB article numbers that support the Israel DST change are listed below:

Product	KB article ID
Windows 11, version 22H2	KB5029351
Windows 11, version 21H2	KB5029332
Windows 10, versions 22H2, 21H2, and 20H2	KB5029331
Windows Server 2022	KB5030216
Windows 10, version 1809	KB5030214
Windows 10, version 1607	KB5030213
Windows Server 2012	KB5030278
Windows Server 2008 SP2	KB5030286
Win 8.1, Windows server 2012R2	KB5030287
Windows 7.0 SP1	KB5030261

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Iran 2023 time zone update now available

SharadaRangaraj — Fri, 12 May 2023 14:45:55 GMT

After returning to the standard time on 22 September 2022, the Iran Government elected to remain permanently in the standard time, cancelling daylight saving time. Hence, Iran will permanently remain at UTC + 3:30 time zone going forward.

Microsoft will release the following Windows Updates in support of this decision. This change is available in the April 2023 Cumulative Update preview released on April 25, 2023, for the 20H2 and newer versions of Windows 10 & 11. All other supported Windows versions will receive the update as part of the May 2023 monthly quality update scheduled to release on May 9, 2023.

All Windows updates containing this fix have the following release note text:

This update affects the Islamic Republic of Iran. The update supports the government’s daylight saving time change order from 2022.

The KB article numbers that support the Iran DST change are listed below:

Product	KB article ID
Windows 11, version 22H2	KB5025305
Windows 11, version 21H2	KB5025298
Windows 10, version 22H2, 21H2, 20H2	KB5025297
Windows Server 2022	KB5026370
Windows Server 2012	KB5026419
Windows Server 2008 SP2	KB5026408
Windows 10 Enterprise LTSC 2015	KB5026382
Windows 10 Enterprise LTSC 2016	KB5026363
Windows 10 Enterprise LTSC 2019	KB5026362
Windows 8.1	KB5026415
Windows 7.0 SP1	KB5026413

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Egypt 2023 time zone update now available

SharadaRangaraj — Tue, 18 Apr 2023 09:18:18 GMT

As a result of the March 1st order from the Government of Egypt, Daylight Saving Time (DST) in the Arab Republic of Egypt will resume from the last Friday of April. Hence, clocks will be set forward by an hour at 12:00 AM on April 28, 2023.

The April 2023 Monthly quality update for Windows includes the following time zone update for Egypt:

Clocks will be set forward by an hour at 12:00 a.m. on April 28, 2023, for the Egypt time zone.

Here are the KB article numbers that contain the Egypt DST fix for different versions of Windows:

Product	KB article ID
Windows 11, version 21H2	KB5025224
Windows 11, version 22H2	KB5023778
Windows Server 2022	KB5025230
Windows Server 2012	KB5025287
Windows Server 2008 SP2	KB5025271
Windows 10, version 22H2, 21H2, 20H2	KB5025221
Windows 10 Enterprise LTSC 2015	KB5025234
Windows 10 Enterprise LTSC 2016	KB5025228
Windows 10 Enterprise LTSC 2019	KB5025229
Windows 8.1	KB5025285
Windows 7.0 SP1	KB5025279

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Mexico 2023 time zone updates now available

SharadaRangaraj — Fri, 31 Mar 2023 19:28:40 GMT

Editor's note (3.31.2023): This article has been updated to provide additional clarity and guidance on time-zone mapping, and to include links to the KB articles offering the time zone fix.

As a result of the October 26th, 2022, order from the Mexican Government, Daylight Saving Time (DST) in the United Mexican States will not be observed in 2023 calendar year. In a subsequent order by the Mexican Government, it was declared that Chihuahua, Coahuila, Nuevo León, Tamaulipas and the state of Baja California near the Mexico-U.S. border will continue to honor the DST schedule defined by the United States in 2007 which starts on the second Sunday of March (March 12, 2023) at 2:00 AM and ends on the first Sunday of November (November 5, 2023) at 2:00 AM.

Microsoft will release Windows Updates in support of these DST changes for Mexico as follows:

A new time zone, America/Ciudad_Juarez, will be created, splitting from the existing time zone America/Ojinaga.
Clocks in the border municipalities of Janos, Ascensión, Juárez, Praxedis G. Guerrero, and Guadalupe will follow the America/Ciudad_Juarez time zone and will move forward by an hour at 2:00 a.m. on March 12, 2023 to UTC-6 (MDT).
Clocks in the border municipalities of Ojinaga, Manuel Benavides, and Coyame will follow the the America/Ojinaga time zone and will move forward by an hour at 2:00 a.m. on March 12, 2023 to UTC-5 (CDT).
Clocks for all states except Baja California, Coahuila de Zaragoza, Nuevo León, Tamaulipas, and Chihuahua will not move forward by an hour at 2:00 a.m. on April 02, 2023.

These changes will appear in the February 2023 Cumulative Update preview for the following Windows versions:

Windows 10, version 20H2
Windows 10, version 21H2
Windows 10, version 22H2
Windows 11, version 21H2
Windows 11, version 22H2

All other supported Windows versions will receive the update as part of March 2023 monthly quality update.

Here are the KB article numbers that contain the Mexico DST fix for different versions of Windows:

Product	KB article ID
Windows 11, version 21H2	KB5022905
Windows 11, version 22H2	KB5022913
Windows Server 2022	KB5023705
Windows Server 2012	KB5023756
Windows Server 2008 SP2	KB5023755
Windows 10 Enterprise LTSC 2015	KB5023713
Windows 10 Enterprise LTSC 2016	KB5023697
Windows 10 Enterprise LTSC 2019	KB5023702
Windows 8.1	KB5023765
Windows 7.0 SP1	KB5023769

We have refrained from adding a new time zone to Windows to avoid compatibility issues. There are functions in ICU, etc. to map between IANA and Windows zones; most of these implementations are legacy and cannot pick up any new mappings. After evaluating several options, we felt repurposing existing time zones would be a better approach. Here is a table to help you map between the IANA Zones and the corresponding Windows zones to help you pick the right zone for your machines.

Windows Display Name	Windows Time Zone ID	DST	IANA Zone
(UTC-06:00) Central Time (US & Canada)	Central Standard Time	US DST	America/Matamoros
(UTC-06:00) Central Time (US & Canada)	Central Standard Time	US DST	America/Ojinaga
(UTC-06:00) Guadalajara, Mexico City, Monterrey	Central Standard Time (Mexico)	No DST	America/Monterrey
			America/Mexico_City
			America/Chihuahua
			America/Bahia_Banderas
			America/Merida
(UTC-05:00) Chetumal	Eastern Standard Time (Mexico)	No DST	America/Cancun
(UTC-07:00) Mountain Time (US & Canada)	Mountain Standard Time	US DST	America/Ciudad_Juarez (New Zone)
(UTC-07:00) La Paz, Mazatlan	Mountain Standard Time (Mexico)	No DST	America/Mazatlan
(UTC-08:00) Baja California	Pacific Standard Time (Mexico)	US DST	America/Tijuana
(UTC-07:00) Arizona	US Mountain Standard Time	No DST	America/Hermosillo

Note: We are unable to provide time-zone mapping at the municipality level for regions that follow multiple DST rules. Hence, please pick the best time zone from the table above. For example, organizations in Anahuac looking to manually map to the right time zone in Anahuac should choose the time zone (UTC -06:00) Central Time (US & Canada).

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.

Fiji 2022 time zone update now available

SharadaRangaraj — Fri, 31 Mar 2023 17:13:08 GMT

As a result of the October 27th order from the Fijian government, Daylight Saving Time (DST) in the Republic of Fiji will not be observed in 2022. Hence, clocks were not advanced by an hour at 02:00 on November 13, 2022.

The November 2022 Cumulative Update preview release for Windows includes the following time zone update for Fiji:

Clocks will not be advanced by an hour at 2:00 a.m. on November 13, 2022, for the Fiji time zone.

This change is for customers running the following Windows versions:

Windows 10, version 20H2
Windows 10, version 21H1
Windows 10, version 21H2
Windows Server 2022
Windows 11, version 21H2
Windows 11, version 22H2

The rest of the Windows versions will receive the update as part of December 2022 monthly quality update. For organisations with devices in the Republic of Fiji on Windows versions not listed above, we recommend temporarily disabling the automatic DST adjustments in Windows to reflect the correct local time between November 13, 2022, and December 13, 2022.

This can be done in one of two ways:

Select the Windows logo key, type "Date and time", and select Date & time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to Off.

OR
Go to Control Panel > Clock and Region > Date and Time > Change time zone and uncheck the option for “Automatically adjust clock for Daylight Saving Time.”

After 10:00 a.m. on December 13, 2022, follow the steps below to re-enable automatic DST adjustments and ensure accurate time switching with future DST transitions.

Select the Windows logo key, type "Date and time", and select Date & time settings. From the Date & time settings page, toggle Adjust for daylight saving time automatically to On.

OR
Go to Control Panel > Clock and Region > Date and Time > Change time zone and check the option for “Automatically adjust clock for Daylight Saving Time.”

For Microsoft's official policy on DST and time zone changes, please see Daylight saving time help and support. For information on how to update Windows to use the latest global time zone rules, see How to configure daylight saving time for Microsoft Windows operating systems.