Currdate to String

  
I have to export an excell file, the filename needs to be like
2016.04.13-Report.xls

First 10 characters are Currdate(), so I have to change the currdate() format only in this case.

Is it possible? How can i do it?

Thanks
Solution
checkout formatdatetime in the text-exension.

btw, don't use dots as seperator..
Solution
thanks!