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 NegInfInterval, because an interval going from negative infinity to positive infinity is not possible.
assert(PosInfInterval!Date(Date(1996, 1, 2)).merge( Interval!Date(Date(1990, 7, 6), Date(2000, 8, 2))) == PosInfInterval!Date(Date(1990, 7 , 6))); assert(PosInfInterval!Date(Date(1996, 1, 2)).merge( Interval!Date(Date(1999, 1, 12), Date(2011, 9, 17))) == PosInfInterval!Date(Date(1996, 1 , 2)));
Returns the union of two intervals