Last date of Deposit of TDS

Please check my file on Due dates www.psomani.caclubindia.com

For the TDS entry passed from 01.03.2008 to 30.03.2008----07.04.2008

For the TDS entry passed as on 31.03.2008 ---31.05.2008

Hi sir,

I have deducted TDS from Advertising contractors today. pls tell me last deposit date of TDS.

please tell me if  I deduct tds on 15th of every month , what will be the due date of depositing tds .

Received a notice from income tax for late payments where Interest paid on 31/03/2008 and remitted on 07/04/2008, but still IT deptt  has made a demand of 1 month late payment. Please guide.