title: SSRS default parameter values in subscription
body: <p>I have a report that has two required date parameters which the user enters. I want to create a subscription that runs on Friday that pulls for the previous week's Sunday through Saturday period. So for example, for this coming Friday, the subscription would pull for Jan 29 - Feb 4. I've tried <code>=Now(), =Today(),  @ExecutionTime</code> and then subtracting the number of days but all I get is errors. Is this possible to do?</p>
  
  <p>I did see this link but I wonder if there's a better way.
  <a href="http://www.sqlservercentral.com/articles/Development/datadrivensubscriptions/2432/" rel="nofollow">http://www.sqlservercentral.com/articles/Development/datadrivensubscriptions/2432/</a></p>
  
  <p>SSRS 2008</p>