We pass our date of death every year and have no idea.
Sometimes when I'm feeling my best-- special occasions with family, getting a new client, having achieved something remarkable-- I do my own Memento Mori.
I ask myself "what if this is my date of death?"
That's a very grounding question for me. It knocks you back and changes your perception of life, make you appreciate the little things you have and reminds you to live life to the fullest.
I'm sure this book will be an interesting read. I'm often into mystery and time travel. I'll have this in my book list.