I'm confused by the instructions. At one point is says that overnight trips could as 0. (Leave on day and come back the next.) At another point, it says that even daytrips must be entered. I don't get it because these instructions seem contradictory. A daytrip and even overnight count as 0. So they still need to be entered? Also, I'm sure that I've made a couple daytrips over the years but couldn't even begin to know the exact dates. What to do?