docs: def unixtimestamp(datetime):
      """Get unix time stamp from that given datetime. If datetime
      is not tzaware then it's assumed that it is UTC
      """
      epoch = UTC.localize(datetime.utcfromtimestamp(0))
      if not datetime.tzinfo:
          dt = UTC.localize(datetime)
      else:
          dt = UTC.normalize(datetime)
      delta = dt - epoch
      return total_seconds(delta)