Anniversary Countdown
Keep the dates you care about on one page and see days until or days since each one.
Anniversary Countdown
Keep the dates you care about on one page and see days until or days since each one.
About Anniversary Countdown
One page for every date, not one calculator per date
Most day counters answer one date and forget it when you close the tab. Here you keep a list: add as many dates as you track, and the cards reorder themselves so whatever comes next sits at the top. Dates that already passed and do not repeat move to the end instead of cluttering the front.
Days remaining and days elapsed are the same question
A birthday is both: the last one was some days ago and the next one is some days away. Mark a date as repeating every year and the card follows the next occurrence automatically once the day passes, and tells you which anniversary that will be — the fifth year at a job, the thirtieth birthday. Dates that happen once keep counting up after they pass, which is what you want for a birth date or the day something started.
Your dates never leave this browser
Birthdays and wedding dates are personal, so the list is stored in this browser's local storage and nowhere else. There is no account, no sync and no network request carrying your entries. That also means the list does not follow you to another device or browser — and if you clear site data it is gone. Sharing is deliberate and one at a time: the copy button builds a link containing only that single anniversary, and opening someone else's link shows a preview you must add yourself.
FAQ
Common questions and answers about this topic.
Are my dates uploaded anywhere?
No. The list is kept in your browser's local storage and no request carries it anywhere. Because of that it does not sync between devices or browsers, and clearing site data removes it.
How does "repeats every year" work?
The card always points at the next time that month and day comes around. On the day itself it says it is today; once the day is over it rolls to next year and the anniversary number goes up by one.
What happens to a February 29 anniversary in a common year?
In years without February 29 it is counted on February 28, the same convention phone and web calendars use. The card says so explicitly rather than quietly changing the date, and in leap years it returns to the 29th.
Does the day count include today?
The number counts whole calendar days between today and the date, so tomorrow shows 1 and the date itself shows as today rather than zero days. Counting uses calendar days rather than 24-hour blocks, so daylight saving changes do not shift the result by a day.
How is this different from the countdown timer or date calculator?
The countdown timer measures minutes and hours for something happening now. The date calculator answers a single question once and keeps nothing. This tool holds a list of dates over months and years and keeps counting each one for you.
Can I share an anniversary with family?
Yes, one at a time. The copy button on a card builds a link that contains only that anniversary. Whoever opens it sees a preview and decides whether to add it to their own list. The whole list is never put in a link.