Try
Code:
=IF(([@[Declaration Date]])<=3/22/2023), DATE(YEAR([@[POP End Date]]), MONTH([@[POP End Date]]), DAY([@[POP End Date]])-60)),DATE(YEAR([@[POP End Date]]), MONTH([@[POP End Date]]), DAY([@[POP End Date]])-90))
Otherwise Please post a sample sheet ( no pics please) with some data . Thx