---
title: experimental.addDuration() function
description: >
  `experimental.addDuration()` adds a duration to a time value and returns the resulting time value.
menu:
  flux_0_x_ref:
    name: experimental.addDuration
    parent: experimental
    identifier: experimental/addDuration
weight: 101
flux/v0.x/tags: [date/time]
introduced: 0.39.0
deprecated: 0.162.0
---

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`experimental.addDuration()` adds a duration to a time value and returns the resulting time value.



##### Function type signature

```js
(d: duration, to: A, ?location: {zone: string, offset: duration}) => time where A: Timeable
```

{{% caption %}}For more information, see [Function type signatures](/flux/v0.x/function-type-signatures/).{{% /caption %}}

## Parameters

### d
({{< req >}})
Duration to add.



### to
({{< req >}})
Time to add the duration to.



### location

Location to use for the time value.

Use an absolute time or a relative duration.
Durations are relative to `now()`.


## Examples

- [Add six hours to a timestamp](#add-six-hours-to-a-timestamp)
- [Add one month to yesterday](#add-one-month-to-yesterday)
- [Add six hours to a relative duration](#add-six-hours-to-a-relative-duration)

### Add six hours to a timestamp

```js
import "experimental"

experimental.addDuration(d: 6h, to: 2019-09-16T12:00:00Z)// Returns 2019-09-16T18:00:00.000000000Z


```


### Add one month to yesterday

A time may be represented as either an explicit timestamp
or as a relative time from the current `now` time. addDuration can
support either type of value.

```js
import "experimental"

option now = () => 2021-12-10T16:27:40Z

experimental.addDuration(d: 1mo, to: -1d)// Returns 2022-01-09T16:27:40Z


```


### Add six hours to a relative duration

```js
import "experimental"

option now = () => 2022-01-01T12:00:00Z

experimental.addDuration(d: 6h, to: 3h)// Returns 2022-01-01T21:00:00.000000000Z


```