# UpdateExpirationForHIT
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## Description
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The `UpdateExpirationForHIT` operation allows you extend the expiration time of a HIT beyond is current expiration or expire a HIT immediately. You cannot shorten the expiration time so that you're not affecting Workers who have accepted your HIT.

 To expire a HIT immediately, provide the value 0 or set ExpireAt to a time in the past. 

## Request Syntax
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```
{ 
  "HITId": String,

  "ExpireAt": Timestamp
 }
```

## Request Parameters
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 The request accepts the following data in JSON format: 


| Name | Description | Required | 
| --- | --- | --- | 
|   ` HITId `   |  The HIT to update. Type: String  |  Yes  | 
|   ` ExpireAt `   |  The date and time at which you want the HIT to expire Type: Timestamp  |  Yes  | 

## Response Elements
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 A successful request for the `UpdateExpirationForHIT` operation returns with no errors and an empty body.