Anniversary Calculator
Pick a date and see how far you have come — and which day worth marking comes next.
The day you met, got together, got married — or any day you want to keep.
How it works
- 01Pick the day in the date field; the result is calculated immediately.
- 02To keep it for next time, choose Save this date. It stays on this device only.
- 03Coming up lists the nearest hundred-day marks and anniversaries so you can plan ahead.
Questions
Is the first day counted?
Yes. Starting on January 1 shows one day together on January 1.
Is the saved date uploaded?
No. It is written to localStorage in your browser and disappears when you clear site data.
Can I calculate a future date?
Yes. Choose a future date and it shows how many days remain until then.
Do leap years affect the result?
Days are counted as calendar days, so February 29 is included normally. No adjustment needed.
Every tool runs inside your browser: no network calls, no uploads, no account.