## Issue description
When creating a CloudFormation stack, the `CreationDate` is always `2011-05-23T15:47:44Z`

## Steps to reproduce
1. Prepare a CloudFormation file, for example
```yml
AWSTemplateFormatVersion: 2010-09-09
Description: My Stack
Resources:
  LambdaCodeBucket:
    Type: AWS::S3::Bucket
    Properties:
      BucketName: my-bucket
```
2. Create a new stack based on this file, I used the command:
```bash
awslocal cloudformation create-stack --stack-name gch --template-body file://stack.yml
```
3. List all the created stacks and confirm the `CreationDate` is not a present date
```
awslocal cloudformation list-stacks
```
```
{
    "StackSummaries": [
        {
            "StackId": "arn:aws:cloudformation:us-east-1:000000000000:stack/stack/27187f13-a645-40a0-8788-62d502358216",
            "StackName": "stack",
            "TemplateDescription": "My Stack",
            "CreationTime": "2011-05-23T15:47:44Z",
            "StackStatus": "CREATE_COMPLETE"
        }
    ]
}
```
record['eventName'] = 'REMOVE'
                record['dynamodb']['Keys'] = data['Key']
                record['dynamodb']['OldImage'] = old_item
        elif action == '%s.CreateTable' % ACTION_PREFIX:
            if 'StreamSpecification' in data:
                if response.status_code == 200:
                    content = json.loads(to_str(response._content))
                    create_dynamodb_stream(data, content['TableDescription'].get('LatestStreamLabel'))
            event_publisher.fire_event(event_publisher.EVENT_DYNAMODB_CREATE_TABLE,
                payload={'n': event_publisher.get_hash(data['TableName'])})
            return
        elif action == '%s.DeleteTable' % ACTION_PREFIX:
            event_publisher.fire_event(event_publisher.EVENT_DYNAMODB_DELETE_TABLE,
                payload={'n': event_publisher.get_hash(data['TableName'])})
            return
        elif action == '%s.UpdateTable' % ACTION_PREFIX:
            if 'StreamSpecification' in data:
                if response.status_code == 200:
                    content = json.loads(to_str(response._content))
                    create_dynamodb_stream(data, content['TableDescription'].get('LatestStreamLabel'))
            return
        else:
            
            return
        if len(records) > 0 and 'eventName' in records[0]:
            if 'TableName' in data:
                records[0]['eventSourceARN'] = aws_stack.dynamodb_table_arn(data['TableName'])
            forward_to_lambda(records)
            forward_to_ddb_stream(records)
    def prepare_batch_write_item_records(self, record, data):