Windows 2019
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NTP : Configure NTP Server
2019/02/04
 
Configure NTP Server to provide time synchronization service to Clients.
If the computer that is an Active Directory Domain Controler, NTP Server feature has already been enabled automatically. So the example follows is for computers to enable NTP Server feature in WorkGroup Environment.
[1] Run PowerShell with Admin Privilege and Configure.
Windows PowerShell
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# confirm current setting (follows are default settings)
PS C:\Users\Administrator> Get-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\w32time\TimeProviders\NtpServer" 

InputProvider                    : 0
AllowNonstandardModeCombinations : 1
EventLogFlags                    : 0
ChainEntryTimeout                : 16
ChainMaxEntries                  : 128
ChainMaxHostEntries              : 4
ChainDisable                     : 0
ChainLoggingRate                 : 30
RequireSecureTimeSyncRequests    : 0
DllName                          : C:\Windows\SYSTEM32\w32time.DLL
Enabled                          : 0
PSPath                           : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Serv
                                   ices\w32time\TimeProviders\NtpServer
PSParentPath                     : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Serv
                                   ices\w32time\TimeProviders
PSChildName                      : NtpServer
PSDrive                          : HKLM
PSProvider                       : Microsoft.PowerShell.Core\Registry

# enable NTP Server feature
PS C:\Users\Administrator> Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\w32time\TimeProviders\NtpServer" -Name "Enabled" -Value 1 

# set [AnnounceFlags] to 5
# number means
# 0x00 : Not a time server
# 0x01 : Always time server
# 0x02 : Automatic time server
# 0x04 : Always reliable time server
# 0x08 : Automatic reliable time server
PS C:\Users\Administrator> Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\services\W32Time\Config" -Name "AnnounceFlags" -Value 5 

# restart Windows Time service
PS C:\Users\Administrator> Restart-Service w32Time 

# if Windows Firewall is running, allow NTP port
PS C:\Users\Administrator> New-NetFirewallRule `
-Name "NTP Server Port" `
-DisplayName "NTP Server Port" `
-Description 'Allow NTP Server Port' `
-Profile Any `
-Direction Inbound `
-Action Allow `
-Protocol UDP `
-Program Any `
-LocalAddress Any `
-LocalPort 123 
[2]
NTP Server Host also needs to synchronize time with other Hosts as an NTP Client.
Refer to here to Configure NTP Client.
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