There is one advantage that a manual time management system like Franklin planner has, that I have never actually seen correctly implemented in an online application. It's the ability to quickly answer the question, "what did I do yesterday?" I desperately want this.

If I have a Franklin planner in my hand, I simply turn back one page and see which tasks got a check mark. It works for any day in the past.

The only date-related control on your search feature is the due date. If you could add a field for "date completed" I could search for tasks completed one day ago and make it a smart folder. It would be awesome if you could add this!

Thanks!