I'm not sure it matters all that much. It is one of the reasons I like the Rational Recovery approach to sobriety dates... why would you count the days of something you don't do anymore? Alot of people struggle thinking things won't be better til they reach x amount of days/years... and then someone comes along and tells them they need to reset their date for whatever reason... it can be really demoralising. People who are honestly trying to stay sober will be honest with themselves. For me, my sobriety date is significant because it is the date I decided to live, by choice, rather than systematically destroying myself. It's like my birthday to me now
But if others don't use the same approach as me I won't get upset about it.