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

[Zhang Weiwu <zhangweiwu@realss.com>]

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)