std.datetime.date.DateTimeException if the two intervals do not intersect or if either interval is empty.
assert(Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)).intersection( Interval!Date(Date(1990, 7, 6), Date(2000, 8, 2))) == Interval!Date(Date(1996, 1 , 2), Date(2000, 8, 2))); assert(Interval!Date(Date(1996, 1, 2), Date(2012, 3, 1)).intersection( Interval!Date(Date(1999, 1, 12), Date(2011, 9, 17))) == Interval!Date(Date(1999, 1 , 12), Date(2011, 9, 17)));
Returns the intersection of two intervals