On the the Time Setting page, you can set the time zone for the host, and add or remove NTP server(s) that your host uses to synchronize time. Setting time zone is useful if you want to set up a maintenance window through the Cloud Services Portal.
You can click Add to add a new NTP server, or choose the checkbox an existing NTP server you want to delete and click Remove to delete it. When you add and use a new NTP server, the host uses the new NTP server for time synchronization and the default settings will not be retained.
If you select the Sync with ESXi check box for hosts deployed through OVA on ESXi servers, the list of NTP servers on the Time Settings page will not be used for the host. If desired, for OVA deployments on ESXi servers, you can enable the Synchronize guest time with host option during the deployment to synchronize your host with the NTP server. If you do not select the Synchronize guest time with host option (or if this option is disabled) during the deployment, the host synchronizes with the Ubuntu NTP servers: ntp.ubuntu.com and ubuntu.pool.ntp.org. If you choose to disable the Synchronize guest time with host option during the deployment and select the Sync with ESXi check box, ensure that you open the UDP 123 port for time synchronization with the Ubuntu NTP servers.
Click Next to go to the Proxy Settings page. You can also click Cancel to cancel the configuration or click Finish to save the configuration.