Daylight saving time help and support

This article describes the Microsoft policy in response to daylight saving time (DST) and time zone changes.

Subscribe to the Microsoft Daylight Saving Time & Time Zone Blog to receive the latest updates on changes around the world.

Original product version: В Windows 10 — all editions
Original KB number: В 22803

Microsoft policy in response to daylight saving time and time zone changes

Many applications and cloud services reference the underlying Windows operating system for daylight saving time (DST) and time zone (TZ) information. To make sure that Windows has the latest and most accurate time data, Microsoft continuously monitors DST and TZ changes that are announced by governments around the world. Microsoft makes an effort to incorporate these changes to Windows, and publishes an update through Windows Update (WU). Each DST and TZ update that is released through WU will have the latest time data and will also supersede any previously issued DST and TZ update.

Recommendations

In order for Microsoft to provide an update at the earliest and ensure a seamless transition to new DST and TZ policies, Microsoft recommends that governments provide the following:

• Ample advance notice (one year or more) of the planned change
• Official published confirmation of planned changes to DST or time zones
• Concentrated efforts to promote the change to affected citizens

Standalone

KB 914387 provides a list of DST updates that have been released. It also includes a short summary of the content that is included in each update. This allows a consistent means for customers and partners to be informed whenever such an update is made available.

Monthly rollups

DST updates are also included in monthly rollup releases. You can find more information about our monthly rollup releases here:

Microsoft DST and TZ support policy

Change type	Change details	Microsoft support policy	Solution
Change to a region’s time zone rules	A subset of the region that shares a time zone makes a change to its DST requirements or changes the time bias of its time zone. A new time zone is required for the affected users within that region because the existing time zone has to remain unchanged for the rest of the users.

New DST or TZ change that does not match the exact parameters of another TZ, including historical time data accuracy (from 2010). Microsoft will introduce a new time zone for such scenarios.

A new Windows time zone entry will be created only when a country or region (including dependencies), or a first-order administrative division of a country or region (state, province, department, and so on), has a separate and distinct history of UTC offsets and DST rules from existing TZ entries. Additionally, a smaller geographic area (county, city, and so on) qualifies for a new Windows time zone entry when its current UTC offset and DST rule combination is not provided by another Windows time zone entry.

Daylight Saving Time in Windows 10

At some point during the year, some of you may see a notification when you click on the Taskbar clock in Windows. The notification could be something to this effect:

Daylight Saving Time ends on (date) at (time). The clock is set to back/forward 1 hour at that time.

Let us see what is Daylight Saving Time, what this notification means and how to change Daylight Saving Time on a Windows system.

What is Daylight Saving Time or DST

Those of you who do not know what is Daylight saving time DST, let me explain in brief.

In most of Europe, local time is moved forward by 1 hour in Spring and moved backward by 1 hour in Autumn. This happens around March or April and ends in October or November. This practice is called Daylight Saving Time. These shifts are different in the North and South hemispheres and may vary from country to country. In the southern hemisphere, the changes are the opposite.

Automatically adjust clock for Daylight Saving Time

Microsoft Windows has established an annual update schedule for Daylight Saving Time (DST) and Time Zone (TZ) releases. From time to time releases DST Cumulative Updates and Updates for Time Zone changes. If you have Windows Update set to ‘automatically install’, there is nothing you need to do, as this will give you a seamless transition to the new Daylight Savings Time and Time Zone settings.

Every country has its own DST implementation policy. Some may not observe DST, while others may change the start dates and end dates for DST every year.

Windows stores time zone information in two locations in the registry.

It is recommended that you use Microsoft Update or download the time zone update from the Microsoft download site instead of manually editing the registry. But if you wish to change the time zone settings manually, you can use the Time Zone Editor or Tzedit.exe tool.

This tool lets you create and edit time zone entries for the date and time settings in the Control Panel. You can read more about this at KB914387.

Depending on your Time Zone, if you have checked the Notify me when the clock changes box, you will see this notification in your Windows Clock in the taskbar. By default, the Automatically adjust clock for Daylight Saving Time option is checked.

If your time zone does not observe DST, then you will see Daylight Saving Time is not observed in this time zone display.

You can access this Date and Time applet via your Control Panel.

Disable Automatic Daylight Savings Adjustment

If you wish to disable Automatic Daylight Savings Adjustment for some reason, you can uncheck the check-box as shown in the above image. Or you may edit the registry as follows:

Open the Windows Registry Editor and navigate to the following key:

Here in the right-side pane, create a new DWORD Value. Name it DisableAutoDaylightTimeSet and give it a value of 1. To enable it back, change its value to 0 or simply delete this key.

Date: October 24, 2018 Tags: Features, Time

Why doesn’t Windows 10 automatically adjust daylight savings time?

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Open the Settings App (gear icon on your Start Menu)

Go to Time and Language — make sure the Daylight Savings Time option is turned on

Then on the left, choose Region and Language

Is your region/country set correctly form there?

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Hello bluecew, my name is Irisdiel and I am an independent advisor.
Down below I have provided 2 methods that may work for you. I suggest following the instructions.

Most likely, the system clock isn’t set to the correct time. Perhaps there’s a problem getting the correct time from the Internet, which is enabled or disabled from the first «Set time automatically» option.
1. Check that your Internet Time settings are correct. Try a different time server if necessary.
Follow the below to check Internet Time settings
1. Go to Control Panel.
2. Search for «Date and Time».
3. Click on «Set the time and date».
4. Click on the «Internet Time» tab.
Click on «Change settings…”.
2. Turn on all options, being sure to turn on «Adjust for daylight saving time automatically» before turning on «Set time zone automatically».

Go to clock bottom right on the bar. Left click and select date and time settings (bottom left). On the left panel select Region and language Then on page select additional date time and region settings. On next window select under Date and Time select Set time and date. On the next screen select change date and time and adjust to your date and time. (note it will not change on this screen but does on the clock on the desktop)

Hope this helps!
Thank you and good luck,
Regards- Irisdiel H.

Adjust for daylight saving time automatically is grayed out in Windows 10

If you live in the USA or some other countries where Daylight Saving Time is available, but find that the setting is not working on your Windows 10 PC, then this post will show you is how to fix it. If the Adjust for daylight saving time automatically option is grayed out in the Windows Settings panel, here are some troubleshooting suggestions that might be helpful for you.

What is Daylight Saving Time setting in Windows 10

Daylight Saving Time or DST is a common practice in the United States and some other regions. If the Daylight Saving Time option is activated on your PC, your system will forward the clock one hour from standard time in the summer and revert the change in the fall. It does this so that users can utilize the sunlight or daylight better during that period.

Like some other devices, Windows 10 has this feature as well. However, if it is not working on your PC or the option is grayed out in the Windows Settings, you can fix it with the help of this guide.

Adjust for daylight saving time automatically is grayed out

To fix Daylight Saving Time is grayed out error in Windows 10, follow these suggestions-

1. Change Time Zone
2. Enable DST from Registry Editor.

1] Change time zone

As mentioned earlier, DST is available only in a few countries around the world. You may, therefore, need to change the Time Zone so that Windows 10 can enable this functionality.

Press Win+I to open Windows Settings, and go to Time & Language setting. Make sure that you are in the Date & time tab. If so, you can expand the Time zone drop-down menu, and select a different time zone where Daylight Saving Time is available.

2] Enable DST from Registry Editor

If the solution, as mentioned above, is not working for you, you must force the adjustment from Registry Editor. For that, open Registry Editor on your PC, and navigate to this path-

On your right-hand side, you can find an entry called DynamicDaylightTimeDisabled.

Make sure that the Data is set to zero (0). If not, you can set that specific data and check if the DST setting is enabled or not.

If you want to force-update the DST adjustment, you can set the Data to one (1).

I hope this works for you.

Date: March 21, 2020 Tags: Time, Troubleshoot

Windows 10 does not update Daylight Savings Time (DST) change

If you notice that your Windows 10 computer does not update Daylight Savings Time (DST) change or that the Windows Time has been changed automatically from DST to Normal Time and changes again every time the PC starts or wake up from hibernate, then this post is intended to help you. In this post, we will provide the appropriate solution you can try to remediate this anomaly.

Windows 10 does not update Daylight Savings Time

The computer uses the date and time to identify when files are created, modified, or deleted; to manage email messages and catalog system restoration points, and to manage many other important system-related activities.

If you’re faced with this issue, you can follow the instructions outlined below to resolve the issue.

Do the following:

1. Right-click the displayed time in the system tray/notification area on the right end of the taskbar, and then click Adjust date/time .
2. In the Date & time window that appears, under the Related settings section, click the Add clocks for different time zones link.
3. Click the Date and Time tab on the windows that pop up.
4. Click the Change time zone.
5. Make sure the correct time zone is selected. Place a checkmark next to Automatically adjust clock for Daylight Saving Time , if it is not already selected.
6. Click OK .
7. Next, click Change date and time button.
8. Click the small left and right arrows in the calendar to select a month and year, and then click a day within the month.
9. Change the time by entering the hour, minute, AM or PM, or by clicking the up-down arrow buttons.
10. Click OK when the time matches the current time.

The time zone, date, and time have been set!

Now, you’ll need to Synchronize time regularly with the Internet Time Server.

Windows can automatically synchronize the date and time with a time server to make sure the accurate time is displayed.

Follow these steps to enable Internet Time:

Note: If your computer is part of a domain, the Internet Time feature is not available. Contact your System Administrator for clock synchronization information.

1. Right-click the displayed time in the taskbar, and then click Adjust date/time .
2. In the Date & time window that appears, under the Related settings section, click the Add clocks for different time zones link.
3. Click the Internet Time tab on the window that pops up.
4. Then, click Change settings .

If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

• Now, make sure that Synchronize with an Internet Time server is checked.
• Next, make sure the computer is connected to the Internet and click the Update Now button.

The computer will now connect to an Internet server and updates the time on the computer.

Note: If the computer fails to receive an update from the selected Internet Time server, a message opens stating that an error has occurred. Select a different server and try again.

• Click OK.

Internet Time is now enabled on your computer!

The issue should now be resolved. However, if you’re still having problems with the clock showing the wrong time when the PC switches from Normal time to Daylight Savings Time (DST), make sure to uncheck the Notify me when clock changes option.