Cognizant — I didnt receive my date of joining yet

Hi, I am rajamuthukumari, i have been selected in cognizant campus interview which has been held on my college. I have completed all my background process and letter of authorisation but still i didnt receive date of joining. May I know when i will receive the date of joining and the further process. Because I am waiting for this from last year. I couldnt access my future. So please assist me or inform me about the further procedure and date of joining process