Why "real" calendar math matters
A quick-and-dirty way to calculate elapsed time is dividing total days by 365.25 to estimate years — but this can drift slightly wrong for any specific date range, since real years aren't a fixed length of days and leap years don't fall evenly. This tool instead walks the actual calendar: it counts whole months first, then whatever days are left over, so a date exactly six years later — spanning multiple leap years in between — comes out as exactly 6 years, 0 months, 0 days, not 5 years 11 months 29 days or some other near-miss. The difference is usually small, but for a milestone that's meant to be exact, it's worth getting the last day right rather than approximately right.
Frequently asked questions
What can I use this for?
Anything with a meaningful start date — an anniversary, a sobriety milestone, a business launch, a move to a new city. The title field is fully editable so it isn't limited to relationships specifically.
How is the years/months/days figure calculated?
Using real calendar math, not an average — it accounts for actual month lengths and leap years, so it's accurate for any date rather than an approximation.
What's the difference between the poster download and the live link?
The poster is a fixed snapshot of the count on the day you download it. The live link recalculates the count every time it's opened, so it stays accurate as more time passes — useful if you want to keep coming back to it rather than re-generating a new poster each time.
Is my date sent anywhere?
No. Everything is calculated and rendered locally in your browser — nothing you enter is sent to a server.