Originally reported in https://github.com/localstack/localstack/issues/2099, the CreationTime for CF stacks was hardcoded. This was fixed in in LocalStack itself (https://github.com/localstack/localstack/pull/2103), but is now also fixed in moto (https://github.com/spulec/moto/pull/2818).

I don't know what version of moto you're using, and whether it's acceptable to use dev-releases, but if you do: 

moto 1.3.15.dev550 should fix this issue, so the LS fix can be removed if you upgrade :) 
import re
import os
import json
import uuid
import boto3
import logging
from requests.models import Request, Response
from six.moves.urllib import parse as urlparse
from samtranslator.translator.transform import transform as transform_sam
from localstack import config
from localstack.utils.aws import aws_stack
from localstack.services.s3 import s3_listener
from localstack.utils.common import to_str, obj_to_xml, safe_requests, run_safe, timestamp
from localstack.utils.analytics import event_publisher
from localstack.utils.cloudformation import template_deployer
from localstack.services.generic_proxy import ProxyListener
XMLNS_CLOUDFORMATION = 'http://cloudformation.amazonaws.com/doc/2010-05-15/'
LOG = logging.getLogger(__name__)
def error_response(message, code=400, error_type='ValidationError'):