How to calculate date2 if we know interval and date1?

Hi there,

I used the function datediff(interval, date1, date2) in VBA. I wonder if we know interval and date1, how could we calculate date2? For example:
interval = 48 days
date1= 25 March 2010
And I want to have a result that date2= 12 May 2010

Thanks for your help and I’m looking forward to hearing from you.