if (currentPeriod == 0 || currentPeriod > newestObservationPeriod) {
      return (
        uint16(RingBufferLib.wrap(_accountDetails.nextObservationIndex, MAX_CARDINALITY)),
        newestObservation,
        true
      );
    }
uint32 currentPeriod = _getTimestampPeriod(PERIOD_LENGTH, PERIOD_OFFSET, currentTime);
    uint32 newestObservationPeriod = _getTimestampPeriod(
      PERIOD_LENGTH,
      PERIOD_OFFSET,
      newestObservation.timestamp
    );
function _getTimestampPeriod(
    uint32 PERIOD_LENGTH,
    uint32 PERIOD_OFFSET,
    uint32 _timestamp
  ) private pure returns (uint32 period) {
    if (_timestamp <= PERIOD_OFFSET) {
      return 0;
    }
    // Shrink by 1 to ensure periods end on a multiple of PERIOD_LENGTH.
    // Increase by 1 to start periods at # 1.
    return ((_timestamp - PERIOD_OFFSET - 1) / PERIOD_LENGTH) + 1;
  }
