---
schema_version: "1"
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title: getMillisecondsInDuration()
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---

# getMillisecondsInDuration()

Returns the number of milliseconds in a duration.

## Signature

`getMillisecondsInDuration(Duration duration)`

## Parameters

**_duration_:** Type: `Duration`. The duration object returned by `$A.localizationService.duration`.

## Returns

**Type: `number`** The number of milliseconds in the duration.

**See Also**  


-   [duration()](https://developer.salesforce.com/docs/platform/aura-platform/guide/ref-jsapi-auralocalizationservice-duration.md)