docs: def timeuntil(d, now=None):
      """
      Like timesince, but returns a string measuring the time until
      the given time.
      """
      if not now:
          if getattr(d, 'tzinfo', None):
              now = datetime.datetime.now(LocalTimezone(d))
          else:
              now = datetime.datetime.now()
      return timesince(now, d)