Time for revision of tds return

There is no due date for filing Revise Return of TDS. You can file revise return of TDS anytime you like

Thanks for the reply.

To be more specific, our company has filed TDS return manually for F.Y. 2008-09. While assessment of one of our vendor, IT department has come across TDS certificates issued by us. Now, IT Department has instructed us to upload the TDS data electronically against the assessee PAN number on NSDL website.

Please guide me how to comply with it.