For me, my sobriety date will always be a rough figure starting around and in December 2009. Sure, I slipped during this past year but I only consider it a learning experience on my road to complete recovery.
I haven't drank anywhere near the level I did every day in almost a year now and the few slips were very small in comparison.
I am now past 40 days without a drop and I'm not looking back. The few bumps in the road only enabled me to see the pavement and I truly believe I am on my way to smooth roadways from here on out.
Therefore, I will always consider my sobriety date December 2009.