How to resolve time issues and Windows Key Activation issues?

Question

How to resolve time issues and Windows Key Activation issues?

Charles 0

Hi,

I've come across an issue with a machine running Windows Server 2019 where we are unable to change the time settings at all whilst running as administrator. Whenever changing any settings it defaults back to what it was. Currently all the settings appear correct with the time zone however it's 1 hour behind exactly. Changing it to be manually set doesn't work and it reverts back after a short time.

We believed this stemmed from an issue with Windows not activating properly on the system. Unfortunately we don't have the product key itself but appears to have been registered on the device

Windows Product Key.png

I have tried to locate the key through the registry editor but it's appears as something different to the last digits in the screenshot. I applied the one from the registry editor but this is failing to activate with issues connecting to the activation servers.

Has anyone experienced this issue or have any suggestions?

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Answer 1

Allan Solomon Mejia 7,995

Hi @Charles

I’d treat these as two separate issues. Windows activation normally doesn’t control whether you can manually change the system time.

For the time issue, the clock changing and then reverting strongly suggests that Windows Time (W32Time), Group Policy, the domain hierarchy, or the virtualization host is setting it back. Domain-joined Windows Server systems normally synchronize from the AD domain hierarchy.

From an elevated Command Prompt, check:

w32tm /query /source
w32tm /query /status
w32tm /query /configuration

If this is a domain member, the source should normally be the domain hierarchy. Also verify the configured time zone/DST, since being exactly one hour out often points to a time-zone or daylight-saving configuration issue rather than an incorrect clock.

For activation, don’t rely on a product key recovered from the registry. It may be a generic KMS client key (GVLK) rather than the organization’s actual license key. Microsoft specifically uses GVLKs for KMS/volume-licensed systems.

Check the actual licensing state with:

slmgr /dlv
slmgr /xpr

/dlv should tell you the installed edition, license status, and activation channel (Retail/MAK/KMS, etc.). If it shows KMS, troubleshoot connectivity/DNS to the organization’s KMS host rather than trying to recover and reinstall the registry key.

Start with those outputs before reinstalling Windows or purchasing/replacing a key. The time issue is very likely independent of the activation problem.

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Charles 0 Reputation points

2026-09-01T08:24:01.9133333+00:00
Hi @Allan Solomon Mejia

Thank you for providing your response.

In terms of the clock issue I did suspect it was due to the time zone as it is exactly an hour out. After going through the commands I can see that the source was set to "Free-running System Clock" and the precision time was "-23"

After some playing around I confirmed that the daylight saving time wasn't being applied properly and I was unable to manually set it successfully through the settings.

To resolve this I was able to set it via the elevated command prompt using the following commands.

tzutil /g tzutil /l tzutil /s "TimeZoneName"

For my "TimeZoneName" I used "GMT Standard Time" from the list.

The time has adjusted for the hour and is now correct.

For the Licensing issue I might have gone too far and lost the original details by trying to apply the key from the registry. Unfortunately I can't find any form of Windows backup to revert to before I changed the product key. Would you then advise I reinstall Windows or purchase a new key?

Any further advise regarding the license is welcome.
Allan Solomon Mejia 7,995 Reputation points

2026-09-01T14:12:04.3433333+00:00

Hello @Charles

Glad you resolved the clock issue. GMT Standard Time should handle the daylight saving adjustment automatically.

For Windows activation, don't reinstall Windows or purchase another key yet. Changing the product key doesn't necessarily invalidate the original digital license tied to the device. Reinstalling the same Windows edition can reactivate automatically if a valid digital license exists.

First, go to Settings → System → Activation and run the Activation troubleshooter/Get Help. Also note the exact activation error code and confirm the installed edition (Home/Pro) matches the original license.

If the PC previously had a digital license linked to your Microsoft account, sign in with that account and let the troubleshooter try to reactivate it.

Only consider purchasing a new license after confirming that Microsoft cannot recover/reactivate the existing entitlement.

Help make this community better for everyone: if this answer resolved your issue, please accept it or upvote it. If not, share more details in a comment so we can continue the discussion and find the right solution.