Create measurement based on parameters

[winglui]

Hi everyone,

I am new to PowerBI so I am not too sure is this very hard to achieve.

I created two parameter fields like below and  would like create some visuals on the days difference 

I am not too sure how to write a measure for calculating the start and end date, and which table should the new column be under.

Thanks a lot

[mh2587]

DaysDiff = DATEDIFF(<Date1>, <Date2>, <Interval>)//Put Day in interval