Timed Access to Airport Express

I have search this forum for any answers but have found none - though may have missed it somewhere.

I have a AX (A1084, 802.11 b/g) which generally has been working fine for years. However, I would like to limit access to only certain MAC addresses and some of these only at certain times. In reviewing set-up documentation, there is mention of a "Timed Access" setting (Tab-Access>MAC Address Access Control:Not enabled; Local; Timed Access; Radius) When I look for this, I see the Not enabled, Local and Radius access control settings but not the timed access control choice. Am I missing something? Any insight would be appreciated.



Thanks