Measure =
VAR MinDate = CALCULATE(MIN('Date'[Date]),ALLSELECTED('Date'))
VAR MaxDate = MAX('Date'[Date])
VAR MinDate2 = MIN('Date (2)'[Date])
VAR deltadays = DATEDIFF(MinDate,MinDate2,DAY)
RETURN
CALCULATE([SalesAmount],DATEADD('Date'[Date],deltadays,DAY))