The interval to merge with this interval.
std.datetime.date.DateTimeException if the two intervals do not intersect and are not adjacent or if the given interval is empty.
Note: There is no overload for merge which takes a PosInfInterval, because an interval going from negative infinity to positive infinity is not possible.
assert(NegInfInterval!Date(Date(2012, 3, 1)).merge( Interval!Date(Date(1990, 7, 6), Date(2000, 8, 2))) == NegInfInterval!Date(Date(2012, 3 , 1))); assert(NegInfInterval!Date(Date(2012, 3, 1)).merge( Interval!Date(Date(1999, 1, 12), Date(2015, 9, 2))) == NegInfInterval!Date(Date(2015, 9 , 2)));
Returns the union of two intervals