Time Sync

Internet Time tab has disappeared from the Date and Time applet of the Control Panel

Administrator mode : 

w32tm /config /syncfromflags:MANUAL /manualpeerlist:time.nist.gov

about not work

below not work

w32tm /config /update

below  work

w32tm /resync

Configure a client computer for automatic domain time synchronization

https://technet.microsoft.com/en-us/library/cc758905(v=ws.10).aspx

Administrative Credentials
To perform this procedure, you must be a member of the Administrators group on the local computer. To perform this procedure from a remote computer, you must be a member of the Domain Admins group.
To configure a client computer for automatic domain time synchronization
Open a Command Prompt.
Type the following command and then press ENTER:
w32tm /config /syncfromflags:domhier /update
Type the following command and then press ENTER:
net stop w32time
Type the following command and then press ENTER:
net start w32time