code: def parse_api_datetime(value):
      
      dt = datetime.strptime(value[0:DATETIME_LEN], API_DATE_FORMAT)
      offset_str = value[DATETIME_LEN:]
      assert offset_str in ["+0000", "Z"], "The Salesforce API returned a weird timezone."
      return dt
docs: parse a datetime returned from the salesforce API.
  
      in python 3 we should just use a strptime %z, but until then we're just going
      to assert that its a fixed offset of +0000 since thats the observed behavior. getting
      python 2 to support fixed offset parsing is too complicated for what we need imo.