Main registry location
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32TimeCommon subkeys
| Subkey | Purpose |
|---|---|
Config |
Service-wide behaviour, phase-correction limits and clock discipline settings. |
Parameters |
The synchronisation type and manual peer list. |
TimeProviders\NtpClient |
Settings for the Windows NTP client provider. |
TimeProviders\NtpServer |
Settings for the Windows NTP server provider. |
Common values
| Value | Location | Purpose |
|---|---|---|
Type |
Parameters |
Controls whether Windows uses the domain hierarchy, manual NTP peers or another mode. |
NtpServer |
Parameters |
Stores the manual peer list and any peer flags. |
AnnounceFlags |
Config |
Influences whether the computer advertises itself as a time source. |
SpecialPollInterval |
TimeProviders\NtpClient |
Defines the fixed polling interval when a peer uses the 0x1 flag. |
Enabled |
TimeProviders\NtpClient or NtpServer |
Enables or disables the corresponding provider. |
MaxPosPhaseCorrection |
Config |
Limits the largest accepted positive correction. |
MaxNegPhaseCorrection |
Config |
Limits the largest accepted negative correction. |
Check the effective configuration
w32tm /query /configurationThis is normally more useful than reading the registry directly because it also shows values supplied by Group Policy.
Group Policy registry path
Policy-managed Windows Time values are commonly written beneath:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\W32TimeIf a setting is supplied by policy, changing the service key directly may have only a temporary effect.