def CopyToDateTimeString(self):
if (self._timestamp is None or self._timestamp < self._INT64_MIN or<EOL>self._timestamp > self._INT64_MAX):<EOL><INDENT>return None<EOL><DEDENT>return super(JavaTime, self).CopyToDateTimeString()<EOL>
Copies the POSIX timestamp to a date and time string.

        Returns:
          str: date and time value formatted as: "YYYY-MM-DD hh:mm:ss.######" or
              None if the timestamp is missing.