Date range ("within X days/weeks/months/years", "after X days/weeks/months/years", "prior X days/weeks/months/years")

Date range ("within X days/weeks/months/years", "after X days/weeks/months/years", "prior X days/weeks/months/years")

Everything has been great, however I'm finding there is a lack of functionality with filters only allowing hard-coded dates.  I don't want to select a date for a report, otherwise the report would be useless in a week and manually have to be recreated.

In the Advanced Filters, it would be great to be able to say something like

Due Date is within 7 days
or
Due Date is within 1 month

I like to see what activities are assigned to a specific user within 14 days.    Right now, all I can choose is:

is
isn't
is before (Then have to select a date in the calendar.  Again, I can create one for now, but it will be obsolete in 14 days)
is after
today
tomorrow
tomorrow onwards
yesterday
till yesterday
is empty
is not empty.