The clock will be set automatically when the device is onboarded into cnMaestro.
Alternately you can enable NTP so the AP will learn time from an NTP server and sync up its clock. To use NTP, under "Configure"->"System" scroll down to the bottom to the section called "Time Settings" and define your NTP server IP address or name. If you dont have a local NTP server you can use some of the public ones on the internet such as "pool.ntp.org":