## 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"
        }
    ]
}
```
import re
import json
import random
import logging
import threading
from binascii import crc32
from requests.models import Response
from localstack import config
from localstack.utils.aws import aws_stack, aws_responses
from localstack.utils.common import to_bytes, to_str, clone
from localstack.utils.analytics import event_publisher
from localstack.services.awslambda import lambda_api
from localstack.services.generic_proxy import ProxyListener
from localstack.services.dynamodbstreams import dynamodbstreams_api
TABLE_DEFINITIONS = {}
ACTION_PREFIX = 'DynamoDB_20120810'
LOGGER = logging.getLogger(__name__)
THROTTLED_ACTIONS = [
    'PutItem', 'BatchWriteItem', 'UpdateItem', 'DeleteItem', 'TransactWriteItems',
    'GetItem', 'Query', 'Scan', 'TransactGetItems', 'BatchGetItem'
]
class ProxyListenerDynamoDB(ProxyListener):
    thread_local = threading.local()
    def __init__(self):