Windows Server time is drifting fixed in three easy steps (using NTP service)
So you keep noticing that your network time is drifting. Users are complaining.
You should have to keep changing the time every other week. The fix is relatively easy. You need to make sure of the service which does it automatically.
From the active directory server, open Powershell (make sure you have administrative rights)
Type in the command as shown in bold:
w32tm /config /manualpeerlist:pool.ntp.org /syncfromflags:MANUAL
Stop-Service w32time
Start-Service w32time
In my exmaple I use pool.ntp.org to get the time from the Internet. I have used them for both Windows and Vmware servers with great success and reliability over the years. You are free to use any NTP service, naturally.
Enjoy being on time!