I would have to day that I would want to know for three reasons:

1) It would make me get my life together for the better.

2) It would help me no take the time I have for granted, "Live everyday to the Fullest."

3) It would help me avoid making irrational decisions.

"Its Ironic that the day your born is the day you start to die." So you kind of already know when your going to kick the bucket, its just how you take and deal with this knowledge.

You know it also has a lot to do with your past and reconciling your wrongs, I've already in my short life reconciled my wrongs so I have no problem going tomorrow if that's gods decision for me. Death is a scary thing and I think knowing kind of gives you an upper hand.