If I knew the date I was going to die, I would change a few things about myself. For starters, I would try to be healthier and exercise more often. I would also spend more time with my family and friends, and try to make the most of every moment. Additionally, I would probably take more risks and seize opportunities that come my way, since I would know that I only have a limited amount of time left. Finally, I would try to enjoy life as much as possible and not sweat the small stuff.