Mine was NYE 2015 (almost 2016). I was at a party and drinking champagne, I started reflecting on my drinking (yet again) and decided I was going to really do it this time. I stopped at midnight and have not had a sip of alcohol since.
I had stopped a few times in the past, but kept falling into the trap of attempting moderation. I failed miserably at moderating, and each time my drinking quickly returned to where I had been when I stopped.
Life continues to throw stressful situations my way, but I've learned to deal with them in healthy ways, rather than avoiding them in an alcohol haze.