In saved searches, to calculate date difference we just need to use the Formula(Numeric) with formula
{datefield ID 1} – {datefield ID 2).
But if one of the date fields is in Date/time format, this formula will not work.
If date difference can not be calculated by this formula, use the following formula
Formula(Numeric) : ABS(TO_DATE({datefield ID 1}) – TO_DATE({datefield ID 2}))
For example, Need a saved search of Inbound shipments, with Expected Delivery Date within the last 7 days.
So used Formula(Numeric) – ABS(TO_DATE({today}) – TO_DATE({expecteddeliverydate})) less than or equal to 7