docs: def __set_timestamp(self, clock):
          """
          If "clock" is None, set the time now.
          This function is called self.__init__()
          """
          if clock is None:
              unix_timestamp = time.mktime(
                  datetime.datetime.now().utctimetuple()
              )
              timestamp = int(unix_timestamp)
  
              return timestamp
  
          else:
              return clock