(RADIATOR) Auto-logoff at specific time i.e 18:00

[Michael Dunne]

I would like to know if radiator can be set to accept connections from a specific time i.e 08:00 and then log those connections off at a specific time as well, i.e 18:00.
I would prefer to do this via SQL, but if not, any other way would be acceptable. Also I would prefer this to be done by a seperate users section.
The only way I can do this at the moment is by writing a cron'ed perl script to do all this, but if Radiator could do this for me I would like to know how.
After reading the manual that is bundled with the distribution I could not see anything clearly that would allow me to do this.