EchoSun13 thinks that the first day of the rest of her life was the day she was born, and today is the 'one millionth" day of the rest of her life. What she fails to hear is the word "rest".
Today is the first day of the rest of her life. The "rest of your life" part is the future, what will happen, so today is the first day of the rest of her life. Right?