Anniversary Calculator
Count how long you’ve been together in years, months and days, with a countdown to the next anniversary and totals in weeks and days. Calculates in your browser.
Together for
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How it's counted
The headline is the completed years since the date, then the leftover whole months and days, using each month’s real length. The countdown is the number of days from your “as of” date to the next anniversary.
Set “as of” to a future date to see how long until a particular milestone, or leave it on today for a live countdown. All dates are handled in UTC and computed in your browser.
What this does
An anniversary calculator counts how long you have been together in years, months and days, with a countdown to the next anniversary and totals in weeks and days.
How to use it
- Enter your start date.
- Leave the “as of” date as today, or set another.
- Read the years/months/days total.
- See the days until your next anniversary.
How it works
It counts completed years since the start date, then the leftover whole months and days, using each month’s real length, the everyday way of saying how long it has been.
time together = as-of date − start date
Understanding your result
The figure counts completed years, then leftover months and days, the everyday way of saying how long it has been, so it only rolls over on the date itself. Use the countdown to the next anniversary to plan ahead, and the week or day totals if you want a round-number milestone to mark between the yearly dates.
Example
A couple who started on 1 June 2020 reach 6 years on 1 June 2026.
Sources & methodology
Last updated .
Frequently asked questions
How is the time together counted?
It counts completed years since the date, then the leftover whole months and days, using each month’s real length, the everyday way of saying how long it has been.
How does the countdown work?
It shows the number of days from your “as of” date to the next anniversary. Leave it on today for a live countdown or set a future date to look ahead.
Is my data stored?
No. Everything is calculated locally in your browser and nothing is sent anywhere.
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