Yeah, every time I had a goal like that, I was (consciously or not) counting the days until I could say, "Hey, I made it! Now I can drink again!"
I celebrated (and still celebrate) milestones like x number of days sober, or months, or years (just celebrated eight years). But having a "goal" or an endpoint in sight, has always tripped me up.
Nowadays my goal is to die sober--hopefully a long time from now. With no drinking in the interim.