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# `std.datetime.interval.NegInfInterval.merge` - multiple declarations

## Function NegInfInterval.merge

Returns the union of two intervals

``` NegInfInterval merge (   scope const Interval!TP interval ) const; ```

### Parameters

NameDescription
interval The interval to merge with this interval.

### Throws

`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.

### Example

``````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)));``````

## Function NegInfInterval.merge

Returns the union of two intervals

``` NegInfInterval merge (   scope const NegInfInterval interval ) const pure nothrow; ```

### Parameters

NameDescription
interval The interval to merge with this interval.

### Note

There is no overload for `merge` which takes a `PosInfInterval`, because an interval going from negative infinity to positive infinity is not possible.

### Example

``````assert(NegInfInterval!Date(Date(2012, 3, 1)).merge(
NegInfInterval!Date(Date(1999, 7, 6))) ==
NegInfInterval!Date(Date(2012, 3 , 1)));

assert(NegInfInterval!Date(Date(2012, 3, 1)).merge(
NegInfInterval!Date(Date(2013, 1, 12))) ==
NegInfInterval!Date(Date(2013, 1 , 12)));``````