docs: def hex_timestamp_to_datetime(hex_timestamp):
      """Converts hex timestamp to a datetime object.
  
      >>> hex_timestamp_to_datetime('558BBCF9')
      datetime.datetime(2015, 6, 25, 8, 34, 1)
      >>> hex_timestamp_to_datetime('0x558BBCF9')
      datetime.datetime(2015, 6, 25, 8, 34, 1)
      >>> datetime.fromtimestamp(0x558BBCF9)
      datetime.datetime(2015, 6, 25, 8, 34, 1)
      """
      if not hex_timestamp.startswith('0x'):
          hex_timestamp = '0x{0}'.format(hex_timestamp)
  
      return datetime.fromtimestamp(int(hex_timestamp, 16))