A simple todo list with a "later" option could do that. I.e. you write "Receive package" (Report in 2 weeks) So, your todolist is empty but you can safely r

A simple todo list with a "later" option could do that. I.e. you write "Receive package" (Report in 2 weeks) So, your todolist is empty but you can safely remove that task from your mind as it will remind you in any due time. (I.e. 2 weeks in this example)