I reset my lawn sprinkler timer, which was more than an hour off due to the spring ritual known as daylight saving time. Rather than move it one hour ahead, I decided to let it run backward. It was mesmerizing to see time back up—so much so that when I reached the desired time, I didn’t stop. I let it go back another 24 hours and then another, one hour at a time. As the numbers counted backward, I let my mind wander. If I could, would I want to relive the time that has passed? Would I want to put my life on rewind? At first, the idea was exhilarating. I would get another chance to accept or reject all those credit card offers that brought me to my knees. Having the chance to apply all that I know now to my life the way it was then—surely that …