I declared a new attribute on FR dictionary, called CarboSolutions-NotBefore. This attribute should contain the data time as a string before what the user should not be able to authenticate. That attribute is placed in radcheck table (like: CarboSolutions-NotBefore >= 20120801). I tried to deal with that following some threads from that forum on similar issues, that sooner or later leads to unlang procedures. I also read the unlang's man page. But I can't understand how to deal with unlang. Can anyone help me to obtain what I need?