If the time shift is negative (to the left), then if checked, zero padding will be applied to the right of the data series so the last sample maintains the same location in time. If the time shift is positive (to the right), then if checked zero padding will be applied to the left of the data series so the first sample maintains the same location in time. By zero padding data points may be added to the data series, but under no condition will data points be removed from the series.