code: def CopyToDateTimeString(cls, time_elements_tuple, fraction_of_second):
      
      if fraction_of_second < 0.0 or fraction_of_second >= 1.0:
        raise ValueError('Fraction of second value: {0:f} out of bounds.'.format(
            fraction_of_second))
  
      microseconds = int(fraction_of_second * definitions.MICROSECONDS_PER_SECOND)
  
      return '{0:04d}-{1:02d}-{2:02d} {3:02d}:{4:02d}:{5:02d}.{6:06d}'.format(
          time_elements_tuple[0], time_elements_tuple[1], time_elements_tuple[2],
          time_elements_tuple[3], time_elements_tuple[4], time_elements_tuple[5],
          microseconds)
docs: Copies the time elements and fraction of second to a string.
  
      Args:
        time_elements_tuple (tuple[int, int, int, int, int, int]):
            time elements, contains year, month, day of month, hours, minutes and
            seconds.
        fraction_of_second (decimal.Decimal): fraction of second, which must be a
            value between 0.0 and 1.0.
  
      Returns:
        str: date and time value formatted as:
            YYYY-MM-DD hh:mm:ss.######
  
      Raises:
        ValueError: if the fraction of second is out of bounds.