Auto-advance
With Auto-Advance, 4.Do can automatically move tasks into the urgent quadrants as their due dates approach.
Tap the Sort button.
Tap Auto-Advance to reveal its options.
Tap the Auto-Advance switch to enable it. From this menu, you can also choose how far ahead of its due date a task is considered urgent.
Note: Auto-Advance doesn't work with manual sort. Enabling one disables the other.