configure ACL: allow access until after a period of time?

Hello.

I've been looking for a solution to define time-based ACL. e.g. a user can access certain entries only since now on until after 3 months. Is it possible?

Of course I can also set up a cron-job or simply mark on my calendar, to remove access of this entry after a period of time, e.g. 3 months. But I wonder if it's possible to let slapd manage it.

e.g. I want to make certain group of users not able to access all contact records in certain department after 2008-08-08 (but still can access other records).

Thank you very much in advance. Would be kind of you to just give me some links where I can get these knowledge myself (didn't seems to find related information in 2.4 admin manual)