[Webtest] Help with using today's date + 10 days

[Tim Heath]

I am using webtest and I really like it!  I researched a number of other 
web testing tools and the only one I found that was even close to 
webtest was perl mechanize but that is not java. 

My code is as follows:

 <setinputfield stepid="set start date"
               name="sivo.effectiveDate"
               value="${startDate}" />

I want ${startDate} to be todays date + 10 days.  Can I do this with 
webtest?  If so how?

Thanks,

Tim Heath