docs: def roundTime(dt=None, roundTo=1):
      """Round a datetime object to any time period (in seconds)
      dt : datetime.datetime object, default now.
      roundTo : Closest number of seconds to round to, default 1 second.
      Author: Thierry Husson 2012 - Use it as you want but don't blame me.
      http://stackoverflow.com/questions/3463930/how-to-round-the-minute-of-a-datetime-object-python/10854034#10854034
      """
      if dt == None : dt = datetime.now()
      seconds = total_seconds(dt - dt.min)
      # // is a floor division, not a comment on following line:
      rounding = (seconds+roundTo/2) // roundTo * roundTo
      return dt + timedelta(0,rounding-seconds,-dt.microsecond)