Authentication by group and time.

Freeradius Dear users, good afternoon! I have a radius server using a mysql database authentication by performing login and mac address working very well. Now I need to implement a new plan of authentication where some users can only connect at a certain time of day (eg Monday to Friday from 18:00 to 22:00 pm and throughout the weekend). Looking for something in the documentation found on the "Login-Time" Freeradius but found nothing of how to deploy this in my current configuration structure. Has anyone made ​​this and could give me some idea of how to do? Thank you! Angelo