Clean Time Calculator
Calculate exactly how much time has passed since a sobriety date — in days and years — for recovery milestones and tracking.
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This is your total clean time in days, with the equivalent in years shown as well.
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How Clean Time Is Calculated
Clean time (sobriety time) is calculated the same way as general elapsed time — total days between your clean date and today, converted to years for an at-a-glance milestone figure.
How to Calculate Clean Time
Days Clean = As-Of Date − Clean Date. Years Clean = Days Clean ÷ 365.25.
Clean Time Calculator Formula
- Days Clean = As-Of Date − Clean Date
- Years Clean = Days Clean ÷ 365.25
Why Track Both Days and Years?
Recovery milestones are often celebrated in days early on (30, 60, 90 days) and in years as time accumulates — having both figures available covers both common ways of marking progress.
Clean Time Calculation Examples
Clean date January 1, 2023, as of July 12, 2026: Days clean = 1,288. Years clean ≈ 3.53 years.
Common Clean Time Calculation Mistakes
Using 365 instead of 365.25 days per year, which slowly drifts the years figure over long periods. Forgetting that both dates are treated as calendar dates without time-zone adjustment — this matters most right around midnight on your clean date's anniversary.
How to Use This Calculator
Enter your sobriety (clean) date and the date to calculate as of (defaults to today if left as today's date).
Formula & Methodology
Calculates the number of whole days between your clean date and the as-of date, then converts to years using 365.25 days per year to account for leap years.
Example: clean date Jan 1, 2024, as of Jan 1, 2026
731 days have passed (accounting for the 2024 leap day) ≈ 2.00 years.
Counts whole calendar days between the two dates. Time zone is not factored in — both dates are treated as calendar dates.
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Frequently Asked Questions
- How is clean time calculated?
- It's the number of whole calendar days between your clean date and today (or any date you choose), converted to years using 365.25 days per year.
- Does this account for leap years?
- Yes — using 365.25 days per year in the year conversion accounts for the extra day added roughly every 4 years.
- Can I calculate clean time as of a past or future date?
- Yes — change the 'as of' date to any date you want to check your clean time against.
Last updated 7/12/2026