parameterized report name in pentaho bi server-5 ce

HI All,

I have a requireemnt to save the reports in daily basis and store them on the basis of their names based on dates.
ie. I need to create the report with its name consisiting the present date.
each day it should when the report is generated it should be saved in to the folder as the "present-date" name.
Example: for present day the report name should be "2013-12-05" and for tomorrow automatically it should be "2013-12-06".

Can anyone guide me how to achieve this. it will be a great help.
As of now I'm doing it manually by changing the name.

Thanks in advance.
Malibu