Most time management books I've read say that the ideal time period for planning is a week. That way if something happens on Monday, it's fine, because you can just do the task on Tuesday. It reduces stress and gives you more flexibility.
Certainly sometimes things like a doctor's appointment have a set date and time, but they're talking about discretionary activities.
How do you plan out your week's activities? Do you use computer software, a notepad, a smart phone app?
