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.