Configuring the Windows Time service to use an internal hardware clock


Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To configure the PDC master without using an external time source, change the announce flag on the PDC master. The PDC master is the server that holds the forest root PDC master role for the domain. This configuration forces the PDC master to announce itself as a reliable time source and uses the built-in complementary metal oxide semiconductor (CMOS) clock. To configure the PDC master by using an internal hardware clock, follow these steps:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINESYSTEMCurrentControlSetServicesW32TimeConfigAnnounceFlags
3. In the right pane, right-click AnnounceFlags, and then click Modify.
4. In Edit DWORD Value, type A in the Value data box, and then click OK.
5. Quit Registry Editor.
6. At the command prompt, type the following command to restart the Windows Time service, and then press ENTER:
net stop w32time && net start w32time

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