Add an NTP Server
Use this procedure to add an NTP server.
Choose System > Network Time and Time Zone Settings. The Network Time and Time Zone Settings window appears.
Click Add. The Add a NTP Server window appears.
Enter the hostname or IP address for the NTP server. To make it the primary NTP server, check the box next to “Preferred”.
Click Add. The Network Time and Time Zone Settings screen appears with the new server listed in the table.