Gary, I understand it's not my place, it's not my burden, and I respect that others might want to or even have to see it differently, but I kind of find your approach refreshing. Your story sounds less about a "date", than it does about a significant lifestyle change. What good is that date if you have one, three, five, however many transgressions in between? You seem like you set your mind to a change, made it, and held to it, to your betterment. Honestly, if it really was about the underlying cause - and don't read that broadly, I'm not implying it's not - the date you first walked into therapy to deal with it head on is probably just as valid a date.
I get that talismans are important to us as humans, but I think we sometimes let the talisman overwhelm what's really important, and that's the underlying cause and effect on our lives (and those of our loved ones).