how to create temporary user ?

[Trio Yulistianto]

dear all...im using freeradius-1.1.6 and mysql database engine
i have a problem.. i want to create a user that only can login in specific
dates..
for example user A can only login today (max 12.00pm this night)
user B can only login today and tomorrow (max 12.00pm tomorrow night)
user C can only login between 2007-05-20 to 2007-05-25

what attribute i should use ?
thanks
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