Use a Network Time Protocol Server
If you set the system time on your computer with a Network Time Protocol (NTP) server, the time value of the NTP server and the time value of the domain controller could exceed the maximum skew. As a result, you will be unable to log on your computer.
If you use an NTP server with a cron job, there will be two processes trying to synchronize the computer's time, causing a conflict that will change the computer's clock back and forth between the time of the two sources.
We recommend that you configure your domain controller to get its time from the NTP server and configure the domain controller's clients to get their time from the domain controller.