117 lines
2.8 KiB
Markdown
117 lines
2.8 KiB
Markdown
---
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title: experimental.subDuration() function
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description: >
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`experimental.subDuration()` subtracts a duration from a time value and returns the resulting time value.
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menu:
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flux_v0_ref:
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name: experimental.subDuration
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parent: experimental
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identifier: experimental/subDuration
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weight: 101
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flux/v0/tags: [date/time]
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introduced: 0.39.0
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deprecated: 0.162.0
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---
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<!------------------------------------------------------------------------------
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IMPORTANT: This page was generated from comments in the Flux source code. Any
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edits made directly to this page will be overwritten the next time the
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documentation is generated.
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To make updates to this documentation, update the function comments above the
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function definition in the Flux source code:
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https://github.com/influxdata/flux/blob/master/stdlib/experimental/experimental.flux#L138-L138
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Contributing to Flux: https://github.com/influxdata/flux#contributing
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Fluxdoc syntax: https://github.com/influxdata/flux/blob/master/docs/fluxdoc.md
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------------------------------------------------------------------------------->
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`experimental.subDuration()` subtracts a duration from a time value and returns the resulting time value.
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{{% warn %}}
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#### Deprecated
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`experimental.subDuration()` is deprecated in favor of [`date.sub()`](/flux/v0/stdlib/date/sub/).
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{{% /warn %}}
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##### Function type signature
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```js
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(d: duration, from: A, ?location: {zone: string, offset: duration}) => time where A: Timeable
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```
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{{% caption %}}
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For more information, see [Function type signatures](/flux/v0/function-type-signatures/).
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{{% /caption %}}
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## Parameters
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### from
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({{< req >}})
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Time to subtract the duration from.
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Use an absolute time or a relative duration.
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Durations are relative to `now()`.
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### d
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({{< req >}})
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Duration to subtract.
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### location
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Location to use for the time value.
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## Examples
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- [Subtract six hours from a timestamp](#subtract-six-hours-from-a-timestamp)
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- [Subtract six hours from a relative duration](#subtract-six-hours-from-a-relative-duration)
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- [Subtract two days from one hour ago](#subtract-two-days-from-one-hour-ago)
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### Subtract six hours from a timestamp
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```js
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import "experimental"
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experimental.subDuration(from: 2019-09-16T12:00:00Z, d: 6h)// Returns 2019-09-16T06:00:00.000000000Z
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```
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### Subtract six hours from a relative duration
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```js
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import "experimental"
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option now = () => 2022-01-01T12:00:00Z
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experimental.subDuration(d: 6h, from: -3h)// Returns 2022-01-01T03:00:00.000000000Z
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```
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### Subtract two days from one hour ago
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A time may be represented as either an explicit timestamp
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or as a relative time from the current `now` time. subDuration can
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support either type of value.
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```js
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import "experimental"
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option now = () => 2021-12-10T16:27:40Z
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experimental.subDuration(from: -1h, d: 2d)// Returns 2021-12-08T15:27:40Z
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```
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