That's because the data doesn't need to be adjusted. Reports can only report on the transactions that have been entered to date. For instance: my fiscal yearend is June 30. If I create a P&L or Balance Sheet for This Fiscal Year  (July 1 2018 to June 30, 2019), the numbers will be exactly the same as the reports I create with dates of July 1, 2018 to March 21, 2019 (today). My yearend doesn't change (still June 30). Reports with both date parameters report only data recorded with dates up to March 21.