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  "identifier" : "/documentation/CoreMotion/CMMovementDisorderManager/monitorKinesiasExpirationDate()",
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  "title" : "monitorKinesiasExpirationDate()"
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# monitorKinesiasExpirationDate()

Returns the expiration date for the most recent monitoring period.

```
func monitorKinesiasExpirationDate() -> Date?
```

## Return Value

The current expiration date, or `nil` if you have not yet begun monitoring.

## Discussion

This date is set when you call the [`monitorKinesias(forDuration:)`](/documentation/CoreMotion/CMMovementDisorderManager/monitorKinesias(forDuration:)) method. You can extend the date by calling [`monitorKinesias(forDuration:)`](/documentation/CoreMotion/CMMovementDisorderManager/monitorKinesias(forDuration:)) again; however, you can’t shorten the monitoring duration.

You can use the expiration date to determine whether you are currently monitoring the user.

```swift
guard let experiationDate = movementDisorderManager.monitorKinesiasExpirationDate() else {
    // You haven't started monitoring the user.
    return
}

if experiationDate > Date() {
    // Currently monitoring the user.
} else {
    // The monitoring period has ended.
}
```

---

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