Tax

dear sir ,

         how to calculate interest on TDS for late deposit & late deduction , in my asseesse has tds deduction date Rs.5000 is 2.8.13 ( due date is sep 7th 2013 ) but deposit date is sep 10th 2013 ,therefore interest months is one month , some body says its 2 & 3 month .. what is correct month & calculation ? pls give interest rate about tds?  urgent sir