A key component of effective time management is to regularly sit down and plan out the next few days in reasonable detail. The big question is, how many days? How far ahead should you plan? Can you go too far or too short?
As I talk about in the time management chapters in my book, you can indeed try to plan too far into the future and too shortly.
Planning out your precise schedule (barring time-specific appointments, like a doctor’s appointment) all day for this Friday when it’s now Sunday is not going to work. Too many thing are going to occur over the next five days that will likely radically alter your specific plans for Friday. Thus, micromanaging Friday on Sunday will just waste your time on Sunday and frustrate you on Friday.