@classmethod<EOL><INDENT>def CopyToDateTimeString(cls, time_elements_tuple, fraction_of_second):<DEDENT>
raise NotImplementedError()<EOL>
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 with fraction
              of second part that corresponds to the precision.