To know the 3rd round counseling date for an affiliated law college, you'll need to specify which college you're interested in. The Consortium of National Law Universities (CLAT) has already conducted its third round of counseling for affiliated colleges. If you're looking for a specific college, you'll need to check their official website for the exact date.

For example,as you are from TN the Tamil Nadu Dr. Ambedkar Law University (TNDALU) conducts its counseling process online and separately for the School of Excellence in Law and affiliated colleges. TNDALU's affiliated colleges have a 3-round counseling process for the LLB (Hons.) program.

If you can provide the name of the specific affiliated law college, a more precise answer can be given. For example, if you are interested in the 3rd round counseling for TNDALU affiliated colleges, you should check their website for updates.