# show clock
In the CLI
To configure an NTP server:
(Instant Access Point)(config)# ntp-server <name>
(Instant Access Point)(config)# end
(Instant Access Point)# commit apply
To configure timezone:
(Instant Access Point)(config)# clock timezone <name> <hour-offset> <minute-offset>
(Instant Access Point)(config)# clock summer-time <timezone> recurring <start-week> <start-day> <start-month> <start-hour> <end-week> <end-day> <end-month> <end-hour>
(Instant Access Point)(config)# end
(Instant Access Point)# commit apply
Source: http://www.arubanetworks.com/techdocs/InstantMobile/Advanced/Content/Chapter4%20Basic%20Configuration%20and%20Deployment%20Tasks/Configuring_an_NTP_Serve.htm