The Network Time Protocol (NTP) provides network users with the ability to synchronise the Windows system clock with a central server. Network users synchronise their system clocks with a domain controller server on the network. The domain controller synchronises with a central Internet server, so all clocks on the network reflect the correct time. This is beneficial for network administrators who have time-sensitive jobs that require the system clock's accuracy to avoid network issues.
Click the Windows "Start" button and select "Programs." Click "Administrative Tools" and then click "Group Policy Editor." This opens your GPO object console editor.
Click "Computer Configuration" on the left panel to expand a list of options. Click "Administrative Templates," "System," then "Windows Time Service."
Click the "Time Providers" key in the central pane. This is where you set the NTP group policy for your network users.
Double-click "Windows NTP Server." Enter your central server name you want to use as the NTP server. This is typically the domain controller for the network. Click "OK" to save the changes.
Close the GPO editor. It may take several minutes for the group policy to propagate on the network and your users' computers to synchronise with the central server clock.