## Add (1 of 2) {#add_1}

Adds specified double value to this duration.

**Returns:** New duration object that represents the value of this instance plus the specified duration value.

```cpp
Add(double val)
```

| Parameter | Description |
| --- | --- |
| val | the specified double value to add to this instance. |

---

## Add (2 of 2) {#add_2}

Adds specified duration to this duration.

**Returns:** New duration object that represents the value of this instance plus the specified duration value.

```cpp
Add(Duration d)
```

| Parameter | Description |
| --- | --- |
| d | specified Duration to add to this instance. |