The original poster in this thread asked for a way in OF to match the Today focus in Things - which does include overdue items (your "past not done item"). If you want to have a list of only items for today, then try what mmurray stated above: use the flag option to mark items for Today and select the "flagged" state for the Flag Filter in the View Bar. Each day you can add and remove flags from your items to get the list you want for that day.