HP Manager Software manual Authentication Attributes for Local Users

			set mac-user attr 247
Table 47 Authentication Attributes for Local Users
Attribute	Description	Valid Value(s)
encryption-type	Type of encryption	One of the following numbers that
	required for access by	identifies an encryption algorithm:
	the client. Clients who	„	1—AES_CCM (Advanced
	attempt to use an
			Encryption Standard using Counter
	unauthorized encryption
			with CBC-MAC)
	method are rejected.
			2—Reserved
		„
		„ 4—TKIP (Temporal Key Integrity
			Protocol)
		„	8—WEP_104 (the default)
			(Wired-Equivalent Privacy protocol
			using 104 bits of key strength)
		„	16—WEP_40 (Wired-Equivalent
			Privacy protocol using 40 bits of
			key strength)
		„	32—NONE (no encryption)
		„	64—Static WEP
		In addition to these values, you can
		specify a sum of them for a
		combination of allowed encryption
		types. For example, to specify
		WEP_104 and WEP_40, use 24.
end-date	Date and time after	Date and time, in the following
	which the user is no	format:
	longer allowed to be on	YY/MM/DD-HH:MM
	the network.

You can use end-datealone or with start-date. You also can use start-date, end-date, or both in conjunction with time-of-day.