Configure NTP Server for Time Sync.
[1]
Right-click [Start] button and open [run] and input [gpedit.msc] like follows.
[2]
Select [Administrative Templates] - [System] - [Windows Time Service] - [Time Providers] on the left pane, and Open [Enable Windows NTP Server] on the right pane.
[3]
Check a box [Enabled] which is upper-left like follows.
[4]
Back to [Windows Time Service] on the left Pane, and click to Open [Global Configuration Settings].
[5]
Check a box [Enabled] which is upper-left and change [AnnounceFlag] to [5] like follows. Then Close Group-Policy-Editor.
[6]
Run [Server Manager] and Open [Tools] - [Services].
[7]
Select [Windows Time] Service and click [Start the service] or [Restart the service]. Furthermore, Change [Startup type] to [Automatic] if it is not the value.
[8]
If Windows Firewall is enabled, allow 123/UDP like follows.
Configure NTP Client
Select [Administrative Templates] - [System] - [Windows Time Service] - [Time Providers] on the left pane, and Open [Enable Windows NTP Client] on the right pane.
Click to open [Configure Windows NTP Client] on the right pane.
Check a box [Enabled] which is upper-left and change values for your environment.
[NtpServer] ⇒ Hostname or IP address of your NTP Server.
The value [0x9] is generally OK to keep default. [0x9] means [0x01] + [0x08].
They mean like follows.
0x01 SpecialInterval
0x02 UseAsFallbackOnly
0x04 SymmetricActive
0x08 NTP request in Client mode
For [Type] section, It's OK to keep default [NT5DS] if your computer is in a Domain, but if not, change to [NTP].
For [SpecialPollInterval], set interval to sync time.
Open [Server Manager] - [Tools] - [Services].