If your computer participates in a domain, it is normal that the properties
of the Windows Time system service are not modifiable.
They would be grayed out by default and the time is synchronized with the domain controller, as required for Kerberos authentication.
You should in this case address yourself to the administrator of the domain.
If your computer is not on a domain, check first
if this also happens when booting in Safe mode.
If the Properties are still not modifiable, then there is a problem with
Windows. Otherwise, some installed product is causing the problem.
If this also happens in Safe mode, check
in the Local Group Policy Editor (
if the permissions have not been corrupted.
Computer Configuration\Windows Settings\Security Settings\Local Policies\User Rights Assignment. Check here the item
Change the system time whose property should be
LOCAL SERVICE,Administrators,NT SERVICE\autotimesvc.
Change the time zone whose value should be
LOCAL SERVICE,Administrators,Users,Device Owners.
If this is not the problem, to set all Windows components to a known state
would require to
Do a Repair Install of Windows 10 with an In-place Upgrade.
This is exactly the same as doing a major Windows upgrade, so you should take
similar precautions, but in most cases has no bad effects.
The main problem is obviously Windows Time will not start since its set to manual and greyed out.
However, I finally devised a solution. Click Run, then type Regedit.
Go to Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time
Modify the Start dword and change the value to 2.
Restart your computer. While Windows time service is still grey out, we have been able to finally start it.
Now go to Date / Time by right clicking your time on bottom right corner. And then click Adjust date/time. Then set time automatic and time zone automatic.
You may and will then see a spinning blue circle as Windows 10 is using all of your CPU’s power to change the time to automatic. Give it some time to complete the operation. It may take up to 5 min even if you have custom built gaming machine. However, it will in fact finish and your time will now be automatic and working again.
So this solution of changing the start value may and probably will work with any greyed out service that you need to start.
@Robert in comments pointed out HOW to check permissions of service which appear to be incorrect on your PC & he’s given you steps on how to fix which you have declined. I am thinking its unlikely you will find the answer to WHY that service got messed up TBH. However you may want to update/rephrase your question to indicate what you are trying to solve exactly: the problem itself or the reason why the problem occurred. Below is some info I can provide that may be helpful: