for me it's the first day i didn't drink.
i checked into a hotel as i couldn't face my family. if i'd had the money, i would have drunk that day. but i didn't have the money so i couldn't drink.
for the first week or so i wa SO angry that i didn't get my 'final drink'. on reflection, it's good that i didn't as i was very, very low and might well have done something i couldn't come back from.