Logging your swim workouts

So I have a general question about the time you all log for your swim workouts.  Yes this is probably just a technicality but I am too detailed of a person to not determine the right away or at least the consensus before I get in a habit.  So the question is what do you calculate as the time you swam in a workout when you log it in the training log?  Do you count the warm up and cool down time and distance?  If your training plan calls for a 30 min workout are you timing the workout from when you enter the pool to when you get out?  If so that would mean you would count the 15-30 sec breaks for ex between sets if you do sets.  

All in all I am just trying to determine a consistent way to track my time in the pool and if I count the entire time and distance (warm up, cool down, breaks, and swim workout) I am not sure if I am cheating myself on my plan and my 100yd average is skewed higher in a sense for the workout.  If I count only the time I swim then I am in the pool longer to achieve the time needed for the plan (not a bad thing just a different perspective), but my 100 yd time is accurate to what I can actually did in the core of the workout.  Like I said over thinking this but just the way it is sometimes.  What do you do?