Returns a value specifying the number of time intervals
between two dates.
Example:
Dim dt1 As Date = #3/1/2014#
Dim dt2 As Date = #4/1/2014#
MessageBox.Show("Day diff: " & DateDiff(DateInterval.Day, dt1, dt2) & " Week diff: " & DateDiff(DateInterval.Weekday, dt1, dt2))
