---
title: experimental.subDuration() function
description: experimental.subDuration() subtracts a duration from a time value and returns the resulting time value.
url: https://docs.influxdata.com/flux/v0/stdlib/experimental/subduration/
estimated_tokens: 1732
product: Flux
version: v0
---

# experimental.subDuration() function

-   Flux 0.39.0 – 0.162.0
-   View InfluxDB support

`experimental.subDuration()` is [subject to change at any time](/flux/v0/stdlib/experimental/#experimental-packages-are-subject-to-change).

`experimental.subDuration()` subtracts a duration from a time value and returns the resulting time value.

#### Deprecated

`experimental.subDuration()` is deprecated in favor of [`date.sub()`](/flux/v0/stdlib/date/sub/).

##### Function type signature

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

For more information, see [Function type signatures](/flux/v0/function-type-signatures/).

## Parameters

### from

(Required) Time to subtract the duration from.

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

### d

(Required) Duration to subtract.

### location

Location to use for the time value.

## Examples

-   [Subtract six hours from a timestamp](#subtract-six-hours-from-a-timestamp)
-   [Subtract six hours from a relative duration](#subtract-six-hours-from-a-relative-duration)
-   [Subtract two days from one hour ago](#subtract-two-days-from-one-hour-ago)

### Subtract six hours from a timestamp

```js
import "experimental"

experimental.subDuration(from: 2019-09-16T12:00:00Z, d: 6h)// Returns 2019-09-16T06:00:00.000000000Z

```

### Subtract six hours from a relative duration

```js
import "experimental"

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

experimental.subDuration(d: 6h, from: -3h)// Returns 2022-01-01T03:00:00.000000000Z

```

### Subtract two days from one hour ago

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

```js
import "experimental"

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

experimental.subDuration(from: -1h, d: 2d)// Returns 2021-12-08T15:27:40Z

```

#### Related

-   [experimental.addDuration() function](/flux/v0/stdlib/experimental/addduration/)

[date/time](/flux/v0/tags/date/time/)