def _GetNormalizedTimestamp(self):
if self._normalized_timestamp is None:<EOL><INDENT>if self._number_of_seconds is not None:<EOL><INDENT>self._normalized_timestamp = (<EOL>decimal.Decimal(self._microseconds) /<EOL>definitions.MICROSECONDS_PER_SECOND)<EOL>self._normalized_timestamp += decimal.Decimal(self._number_of_seconds)<EOL><DEDENT><DEDENT>return self._normalized_timestamp<EOL>
Retrieves the normalized timestamp.

        Returns:
          decimal.Decimal: normalized timestamp, which contains the number of
              seconds since January 1, 1970 00:00:00 and a fraction of second used
              for increased precision, or None if the normalized timestamp cannot be
              determined.