title: Getting JSON serializable error for datetime
body: <p>I am trying to fetch the CloudFormation stack details using boto3 as below</p>
  
  <pre><code>import boto3
  import json
  
  def lambda_handler(event, context):
      global cnfOutput
      cnfOutput = cfn1.describe_stacks(StackName='cfn-init-stack1')
      cnf2 = json.dumps(cnfOutput)
      return cnf2
  </code></pre>
  
  <p>Below is the output I get if I print cfnOutput. I tried to do json.dumps and getting the error. Please need help</p>
  
  <pre><code>{u'Stacks': [{u'StackId': 'arn:aws:cloudformation:us-west-2:123456789123:stack/cfn-init-stack1/d209-11e8-b83e-0ad6ed005066', u'Description': 'CloudFormation template for creating an ec2 instance', u'Parameters': [{u'ParameterValue': 'e1', u'ParameterKey': 'KeyName'}, {u'ParameterValue': 'ami-a0cfeed8', u'ParameterKey': 'ImageId'}, {u'ParameterValue': 't2.micro', u'ParameterKey': 'InstanceType'}], u'Tags': [], u'Outputs': [{u'Description': 'The public name of the EC2 instance.', u'OutputKey': 'PublicName', u'OutputValue': 'ec2-51-111-211-211.us-west-2.compute.amazonaws.com'}], u'RoleARN': 'arn:aws:iam::123456789123:role/CFN1-role', u'EnableTerminationProtection': False, u'CreationTime': datetime.datetime(2018, 10, 17, 12, 40, 10, 783000, tzinfo=tzlocal()), u'StackName': 'cfn-init-stack1', u'NotificationARNs': ['arn:aws:sns:us-west-2:123456789123:topic2'], u'StackStatus': 'CREATE_COMPLETE', u'DisableRollback': False, u'RollbackConfiguration': {u'RollbackTriggers': []}}], 'ResponseMetadata': {'RetryAttempts': 0, 'HTTPStatusCode': 200, 'RequestId': 'd20e-11e8-b15b-a11f0bf7ba', 'HTTPHeaders': {'x-amzn-requestid': 'd20e-11e8-b15b-a11f0bf7ba', 'date': 'Wed, 17 Oct 2018 13:13:11 GMT', 'content-length': '2010', 'content-type': 'text/xml'}}}
  </code></pre>
  
  <p><strong>Getting below error</strong></p>
  
  <blockquote>
    <p>File "/usr/lib64/python2.7/json/encoder.py", line 184, in default
        raise TypeError(repr(o) + " is not JSON serializable") TypeError: datetime.datetime(2018, 10, 17, 12, 40, 10, 783000, tzinfo=tzlocal())
    is not JSON serializable</p>
  </blockquote>