How to temporarily stop time syncing with domain controller?

Open the registry editor (regedit), navigate to:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters

Find the REG_SZ value named Type. Edit the value to NoSync. Set it back to Nt5DS when you need to sync with the domain hierarchy again.

You can do this from the command line by calling

reg add HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Parameters /v Type /d NoSync /f

or in PowerShell, with:

Set-ItemProperty HKLM:\SYSTEM\CurrentControlSet\services\W32Time\Parameters -Name "Type" -Value "NoSync"

Disable the Windows Time service or block the outbound port 123 on your local firewall.

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