Sometimes we just need to plan our days to make better use of the hours. Sometimes we just need our days to be more structured. But we have to do lots of tasks in one day. and we can not remember all tasks. so just make a to-do list which can reduce little stress.
Moreover, some people like to save their day. They would like to write whatever become with them. this is like a digital diary.
In addition, one can save their expense and see total of expense.