While not the same as the Date Filters topic, there’s a desire to use natural language dates in different ways.
When I go to add a due date to a task I’d love to be able to type “3 days from now”, “tomorrow”, or something like “in two months” and Height parse my intent to the best of its ability.
The best examples I’ve seen of this just yet would be in Fantastical, iOS Reminders, and Things.