Sober since date calculator
"I've been sober since…" Pick your sobriety date below and see exactly how long that is in days, weeks, months, and years.
A sober since date calculator takes one thing, the date you stopped drinking, and translates it into the total alcohol-free time you've actually accumulated. That total is the answer to "how long have I been sober?" without you having to do any mental arithmetic about leap years, calendar months, or how many days are in February.
This page exists for the searcher who already knows the date and just wants the number. If you don't know your exact date, this calculator handles the same question with a more forgiving framing. If you want to see future milestone dates from your sobriety date as well, the sober milestones calculator does that. All three share the same underlying math; what differs is what you want to read out the other end.
How sober time is calculated from your sobriety date
Days sober =
floor((today − sobrietyDate) / 86,400,000 ms), with both
dates normalised to UTC midnight so the count doesn't shift when
you cross a time zone. Weeks come from floor(days / 7);
months and years are walked by calendar (same day-of-month each
step) rather than divided by an average month length.
Full derivations and source citations live on the methodology page.
Sober since date: questions people ask
What is a sobriety date?
It's the date you stopped drinking, the day you start counting from. Some people use the last day they drank; others use the first full day they did not. Either convention works as long as you stay consistent; the calculator just measures from whatever date you give it.
How do I figure out my sober date?
Most people remember the day, or the day after. If you don't, pick the closest date you are sure of and use that. The calculator returns a count for whatever start date you choose, so a wrong-by-a-day date gives a wrong-by-a-day count, which is close enough for almost every use.
What does "sober since" mean on this calculator?
It's the start of the stretch. The page assumes continuous abstinence from that date to today. If you had a slip and reset, the date you reset to is the sobriety date the calculator wants.
Is my sobriety date the day I quit or the day after?
Different traditions answer this differently. AA-style counting often uses the first full day without alcohol as day one. Other traditions use the last day you drank as day zero. The calculator on this page treats your input as day zero, so the count ticks to 1 twenty-four hours later. If you prefer the other convention, mentally add one to whatever it shows.
Can I change my sobriety date?
Of course, re-enter any date and the count updates. Outside this calculator, the date is yours: there's no central registry. People update theirs after a slip, after remembering the exact day, or after deciding that a different date better reflects what happened.