Filter option "a due date"
Is it possible to create a filter which shows all tasks that have some kind of due date?
Can you please explain further, what do you mean by some kind of date? You can search for a specific date if you'd like, just by entering the exact date.
By that I mean all tasks that have a due date. The opposite of filter "no due date".
Technically, it's possible but not directly. That is - you can't use a specific filter that will display all tasks with any due date, but if you search for "7 days" or "30 days", then you will see all tasks that have a due date within this timeframe.