How to configure daylight saving time for Microsoft Windows operating systems

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials More

For more information, see the following Microsoft Knowledge Base article:
931667 How to address time zone changes by using the Time Zone Data Update Tool for Microsoft Office Outlook


Daylight saving time implementation varies from country to country. Some countries may not observe daylight saving time, whereas other countries may change the start dates and end dates for daylight saving time every year. This article describes how to update Windows to use the latest global time zone rules.


In many countries, the start dates and end dates for daylight saving time (DST) change from year to year. Additionally, countries may change their policy of how they recognize daylight saving time, or they may change the local time offset from Coordinated Universal Time (UTC).

This article contains information about how to update the registry in Microsoft Windows to accommodate these kinds of ongoing changes. All computers should be updated to include these time zone updates regardless of whether they are located in a changing time zone. This is because some applications may use the local time zone database to perform date and time calculations for events that occur elsewhere in the world.

Please install the time zone updates as soon as possible. This minimizes the number of Outlook and Exchange meetings or calendar events that are scheduled during the period that will experience changes.

For the latest daylight saving time update for Windows, see the following Microsoft Knowledge Base article:The samples in this article update the global time zone rules that are used in Windows as of December 2011. For more information about how daylight saving time changes may affect other Microsoft products, go to the following Microsoft website:

Updates that have been issued

The following daylight saving time updates have been issued for Windows since 2010.

Note The cumulative updates are rollups of all previous changes. The latest cumulative update is the only one that is required. The old updates do not have to be explicitly installed.

June 2016 cumulative update
To download this update, see the following article in the Microsoft Knowledge Base:
3162835 June 2016 DST and time zone update for Windows

Time zone changes

  • Venezuela

    Venezuela advanced its clocks by 30 minutes on May 1, 2016. This change sets Venezuela’s standard time zone offset from "(UTC-04:30) Caracas" to "(UTC-04:00) Caracas."

    Time zone key name Display name Old time zone offset New time zone offset
    Venezuela Standard Time (UTC-04:00) Caracas UTC-04:30 UTC-04:00

  • Egypt

    Egypt has announced that it will observe DST this year starting on Friday, July 8, 2016 at midnight and ending on Friday, October 28, 2016, at midnight.

    Time zone key name Display name DST start DST end
    Egypt Standard Time (UTC+02:00) Cairo July 8, 2016, 00:00 October 28, 2016, 00:00

  • Magadan, Russia

    Russia has moved the Magadan Oblast region from UTC+10:00 to UTC+11:00 on April 24. This update changes the Magadan time zone display to "(UTC+11:00) Magadan."

    Time zone key name Display name Old time zone offset New time zone offset
    Magadan Standard Time (UTC+11:00) Magadan UTC+10:00 UTC+11:00

  • Tomsk, Russia

    Russia moved the Tomsk Oblast region from UTC+06:00 to UTC+07:00 on May 29. This update introduces a Windows time zone for the Tomsk region. After the update is installed, we recommend that users in the new time zone switch to "(UTC+07:00) Tomsk" because this time zone will correctly account for historical time data for this region.

    Time zone key name Display name Old time zone offset New time zone offset
    Tomsk Standard Time (UTC+07:00) Tomsk UTC+06:00 UTC+07:00

  • Morocco

    The DST period for Morocco resumes after the Muslim month of Ramadan (02:00 on Sunday, July 10, 2016, to 03:00 on Sunday, October 30, 2016, in the Gregorian calendar).

    Time zone key name Display name DST start DST end
    Morocco Standard Time (UTC+00:00) Casablanca July 10, 2016, 02:00 October 30, 2016, 03:00

More Information


For more information, see the following articles in the Microsoft Knowledge Base:
256986 Windows registry information for advanced users
310516 How to add, modify, or delete registry subkeys and values by using a registration entries (.reg) file
100010 What are Control Sets? What is CurrentControlSet?
322756 How to back up and restore the registry in Windows
310516 How to obtain Microsoft support files from online services

How to set the computer time and time zone in Windows Vista

How to set the time zone in Microsoft Office