About this tool
This couple anniversary calculator tells you how long you have been together and when your next milestones fall.
Enter the day you started dating and it shows today's day count plus the dates of day 100, 200, 300, 500, 1000 and 2000, and of your first, second and third yearly anniversaries.
In the Korean style, which is the default here, the first day counts as day 1, so day 100 is exactly 99 days after the start date.
If you prefer to count the start date as day 0, switch the option off and day 100 moves one day later.
For example, if you got together on 2026-01-01, Korean-style day 100 is 2026-04-10, and the first anniversary is 2027-01-01.
Each date comes with its weekday, so you can plan dinners or trips in advance, and the next upcoming milestone is highlighted.
Yearly anniversaries use the same calendar date, and a February 29 start falls on February 28 in non-leap years. The calculation uses calendar days from your device's current date, ignoring time of day.
Everything runs in your browser, and the date you enter is never sent to a server. Results are for reference and fun; many couples choose their own way of counting, so use whichever rule you both like.
How to use
- Pick the day you got together.
- Keep the Korean-style option on to count that day as day 1, or turn it off to count it as day 0.
- Check the list for the dates and weekdays of each milestone; the next one is highlighted.
- Share the page with your partner.