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# AWS::IoT::AccountAuditConfiguration CertExpirationCheckCustomConfiguration
<a name="aws-properties-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration"></a>

Configuration structure containing settings for the device certificate expiration check.

## Syntax
<a name="aws-properties-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-syntax"></a>

To declare this entity in your Amazon CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-syntax.json"></a>

```
{
  "[CertExpirationThresholdInDays](#cfn-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-certexpirationthresholdindays)" : {{String}}
}
```

### YAML
<a name="aws-properties-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-syntax.yaml"></a>

```
  [CertExpirationThresholdInDays](#cfn-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-certexpirationthresholdindays): {{String}}
```

## Properties
<a name="aws-properties-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-properties"></a>

`CertExpirationThresholdInDays`  <a name="cfn-iot-accountauditconfiguration-certexpirationcheckcustomconfiguration-certexpirationthresholdindays"></a>
The number of days before expiration that defines when a device certificate is considered to be approaching expiration. The check will report a finding if a certificate will expire within this number of days.  
*Required*: No  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)