Sober date are something that hold a decent emphasis within the recovery community.
They are often referred to as birthdays. 
If you look a your sober date as the day you stared to live fully, then it makes sense to be a birthday. 

In this episode you will hear about the struggle of long term sobriety.  What it means to be sober another year.  

There are thoughts associated with another year and I express them in this episode.