## 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"
        }
    ]
}
```
keys = dynamodb_extract_keys(item=data['Item'], table_name=data['TableName'])
                if isinstance(keys, Response):
                    return keys
                
                if response._content == '{}':
                    response._content = json.dumps({'Attributes': data['Item']})
                    fix_headers_for_updated_response(response)
                
                record['dynamodb']['Keys'] = keys
                record['dynamodb']['NewImage'] = data['Item']
                record['dynamodb']['SizeBytes'] = len(json.dumps(data['Item']))
                if existing_item:
                    record['dynamodb']['OldImage'] = existing_item
        elif action in ['%s.GetItem' % ACTION_PREFIX, '%s.Query' % ACTION_PREFIX]:
            if response.status_code == 200:
                content = json.loads(to_str(response.content))
                
                
                if 'ConsumedCapacity' not in content and data.get('ReturnConsumedCapacity') in ['TOTAL', 'INDEXES']:
                    content['ConsumedCapacity'] = {
                        'TableName': data['TableName'],
                        'CapacityUnits': 5,             
                        'ReadCapacityUnits': 2,
                        'WriteCapacityUnits': 3
                    }
                    response._content = json.dumps(content)
                    fix_headers_for_updated_response(response)
        elif action == '%s.DeleteItem' % ACTION_PREFIX:
            if response.status_code == 200:
                old_item = self._thread_local('existing_item')