This is the new *Amazon CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [Amazon CloudFormation User Guide](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::S3::Bucket PartitionedPrefix
<a name="aws-properties-s3-bucket-partitionedprefix"></a>

Amazon S3 keys for log objects are partitioned in the following format:

 `[DestinationPrefix][SourceAccountId]/[SourceRegion]/[SourceBucket]/[YYYY]/[MM]/[DD]/[YYYY]-[MM]-[DD]-[hh]-[mm]-[ss]-[UniqueString]` 

PartitionedPrefix defaults to EventTime delivery when server access logs are delivered.

## Syntax
<a name="aws-properties-s3-bucket-partitionedprefix-syntax"></a>

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

### JSON
<a name="aws-properties-s3-bucket-partitionedprefix-syntax.json"></a>

```
{
  "[PartitionDateSource](#cfn-s3-bucket-partitionedprefix-partitiondatesource)" : {{String}}
}
```

### YAML
<a name="aws-properties-s3-bucket-partitionedprefix-syntax.yaml"></a>

```
  [PartitionDateSource](#cfn-s3-bucket-partitionedprefix-partitiondatesource): {{String}}
```

## Properties
<a name="aws-properties-s3-bucket-partitionedprefix-properties"></a>

`PartitionDateSource`  <a name="cfn-s3-bucket-partitionedprefix-partitiondatesource"></a>
Specifies the partition date source for the partitioned prefix. `PartitionDateSource` can be `EventTime` or `DeliveryTime`.  
For `DeliveryTime`, the time in the log file names corresponds to the delivery time for the log files.   
 For `EventTime`, The logs delivered are for a specific day only. The year, month, and day correspond to the day on which the event occurred, and the hour, minutes and seconds are set to 00 in the key.  
*Required*: No  
*Type*: String  
*Allowed values*: `EventTime | DeliveryTime`  
*Update requires*: [No interruption](https://docs.amazonaws.cn/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)