From when not, iiit counciling start,

Hello,
From your question, I assume that you are asking about the counseling dates for admission in NITs and IIITs. Well, the counseling for NITs and IIITs is done through Josaa counseling based on your ranks. Josaa counseling will begin in few days. You have to apply for Josaa counseling, according to your JEE Mains rank and preferences, you will be alloted seats in respective NITs and IIITs. Then, you can choose a seat and take admission.
I hope you understood this. For any further queries, ask me in the comments.