Could you be more specific as to what application you are actually wanting to address? Aura covers just about all the Avaya products and there are differences for some.
For CM, in the SMI, you set the time zone as well as the NTP server(s). By default the CM gets it's time from the AVP host it is installed on. You can also adjust the time and date, time zone and NTP server(s) for the AVP host.