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 :) 
}
    },
    'StepFunctions::Activity': {
        'create': {
            'function': 'create_activity',
            'parameters': {
                'name': ['Name', PLACEHOLDER_RESOURCE_NAME],
                'tags': 'Tags'
            }
        }
    },
    'SNS::Subscription': {
        'create': {
            'function': 'subscribe',
            'parameters': {
                'TopicArn': 'TopicArn',
                'Protocol': 'Protocol',
                'Endpoint': 'Endpoint',
                'Attributes': sns_subscription_params
            }
        }
    },
    'CloudFormation::Stack': {
        'create': {
            'function': 'create_stack',
            'parameters': get_nested_stack_params
        }
    }
}
def convert_acl_cf_to_s3(acl):