I have an API that returns JSON with datetime fields.

{
  ...
  "createdAt": "2021-11-01T12:08:05.334Z",
  "createdUser": "dev",
  "updatedAt": "2021-11-01T12:10:59.000Z",
  "updatedUser": "dev",
  "versionFlag": 3
}

I need to write a test that the above datetime fields are in correct format. (Just correct format that represents a correct timestamp. no need to verify the value)

expect(markerTypeInfo.createdAt).to.be.a('Date') is failing because the input is in string type. How this is done properly?