If you have a Domain Controller that will not keep the time accurately, run these commands to force it to sync with a Time Server on the Internet.
Open Command Prompt as Administrator
net stop w32time
w32tm /config /syncfromflags:manual /manualpeerlist:"0.pool.ntp.org, 1.pool.ntp.org, 2.pool.ntp.org"
w32tm /config /reliable:yes
net start w32time