sir, can you please tell me if i submit obc certificate which is issued to me before 1 january 2010 at the time of counslling in iit will it be rejected

No , It will not be rejected .

Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation.