On Windows Server, you can manually configure the NTP time sync service to use outside servers.
To do this, execute the following command:
w32tm /config "/manualpeerlist:0.us.pool.ntp.org 1.us.pool.ntp.org 2.us.pool.ntp.org" /update w32tm /resync
To confirm the peer list, execute
w32tm /query /peers
Within a few seconds, your server time will now be in sync with the public NTP time servers.