30 August 2013
The time limit for A.y 2010-11 filing is upto 31-3-2013. With out filing of Income tax return you can't claim TDS refund.
So now you didn't file or claim TDS refund for such assessment year.
In case of if you received any notice u/s 142(1) then in such case only you can file return of income and claim TDS refund for such assessment year otherwise not possible and you have to forget about your refund amount.