I had a good long think about this when I first stopped.
When I finally realised I had to give up drinking, I knew it would have to be forever. But it was very difficult to conceptualise "forever" both generally and when contemplating specific occasions, like future birthdays, celebrations, football finals etc. So like so many others, I focussed on "I will not drink today".
At the same time, I felt that only focussing on today was kind of kidding myself and even perhaps leaving the door open for drinking down the track.
I finally settled on: "I will not drink today, and I will think that way everyday, forever."
That satisfied me.