append date to exporting file name in SQL reporting service

When exporting a report to another format, say excel,PDF; the file name is always set to the report name. Our client has a requirement where whenever a user exports a report to pdf, the timestamp of when the data of the report was made should be appended in the filename. Is there a way to do this in Reporting Services ?

example : Report name : Testreport

Exported file should be : Testingreport-November-22-2007.pdf

please help me in this

Thanks
sukuTry here:

http://www.codeproject.com/sqlrs/PDFUsingSQLRepServices.asp|||I would suggest placing the timestamp inside of the report.
ie. "Report was generated November 22 2007 11:01am".
This way the client cannot change the "report date".

Because it is a PDF and thus you won't be editing the document you can sort it by "Date Modified" in explorer if you want to sort the files.