Obsessing! Ugh!

I have a question for any AA folks who might come across this...do you get your milestone chip on the day itself or the day after?  As in, today is Day 30 for me, but technically I have only 29 days sober under my belt since the 30th day isn't over. Would it be more appropriate to obtain your chip on Day 31, thereby technically having "30 days"?  I don't mean to obsess or overthink this.  I inquired about this on the Living Sober website and people were awesome and basically said, just chill and own the days.  I am just curious is all.  Not planning to get the chip today, or necessarily at all, who knows, but if I do (or the 60 Day chip, or One Year for that matter....not trying to get ahead of myself, eek!), I just want it to be an honest/accurate count of sobriety.  Some seem to measure in days, some in months, some in years, some not at all.  I guess it's safer to get it the day after.  Since after all, it is "one day at a time" in AA............agggghhh, why am I obsessing about this??  Better than drinking I suppose :).