26 September 2010
TDS can be issue once the payment is made in monthly related to fy 2009-10, while issuing return acknowledgment number available need to be mention. so after filing the retun you can put the date related to return
06 October 2010
now it is compulsary to issue tds certificate monthly or quaterly. and you can issue tds certificate within one week from the date of deposit of tds.