Anniversary
Milestones and yearly counts
Input
Result
Everything is calculated in your browser. The dates you type are never sent to a server.
How to use
Enter a starting date and see when the milestones — 100 days, 200 days, one year — fall, along with how long until the next one. Dates are never uploaded.
When to use it
- Looking ahead to a relationship's 100-day or one-year mark.
- Keeping track of a company or employment anniversary.
- Working out a baby's 100-day and first-birthday dates.
How to use it
- Pick the start date.
- Choose how the days are counted — start date as day one, or the day after. The default is the start date.
- The milestone list, the next milestone and the days remaining appear together.
Good to know
- By default the 100-day count treats the start date as day one, the convention most widely used for these anniversaries. Switching to "the day after" shifts every date by one day.
- With a 29 February start, anniversaries in common years fall on 28 February, and the screen says so.
- All calculations follow the calendar and happen inside your browser.
- If this device's date is wrong, the "days remaining" figure is wrong too.
Frequently asked questions
My 100-day date is one off from another site.
It depends whether the start date counts as day one. By default it does, so the hundredth day lands 99 days after the start; switch the counting and it moves one day later.
When is the one-year mark?
The same month and day. Start on 10 May 2024 and the anniversary is 10 May 2025. That can differ by a day from "365 days" whenever a leap day falls in between.
Can I add a custom milestone such as 700 days?
Use the date add/subtract tool to add that many days to the start date. Counting the start as day one, add 499.
I started on 29 February.
Common years use 28 February, and the screen states it. Some people prefer 1 March, so it is worth keeping both in mind.