As I write this, it’s March 18th, 2010. I just got my census, which asks how many people “were” living in my apartment on April 1st, 2010.
I could fill it out and send it in now, but what if one of us dies in the next two weeks? My answers would be wrong then. I’d better wait until April to fill it out.
But on the other hand, if one of us dies in the next two weeks, the remaining resident will probably be too distraught to remember to fill out the census. Do I risk giving wrong answers, or risk never sending in the census at all?
(Of course, I’m not actually asking for your advice in this matter, since I know you cannot send advice a year into the past. Unless you’re an awesome time traveler, in which case maybe you already have.)