Several dating systems were used on Pern throughout its history. While the early colonists recorded dates by counting the years that had passed since they had arrived on Pern, as time went on, Pern's history was recorded by counting how many years had passed since the beginning of the Pass or Interval. Hence, 259 AL becomes the Second Year of the Second Pass. * After Landing: 2508AL * Pass/Interval: (Day).(Month).1 - First Year of the Ninth Pass. * AIVAS Adjusted Turn: 2521AL