Create a variable and set the variable to evalueate as expression = True.

Create an expression that creates the file name as you require.

In the file transfer section of your ftp task, set the IsLocalPathVariable = True, and then select the variable you set up above.

Or remote path, whatever the case may be.

This link will show you how to do everything, Pick out the pieces you need.

http://zlika.org/index.php/2010/06/06/simple-ssis-project-part-1/[/url]