What are couple milestones?

Anniversaries come once a year, but plenty of couples also celebrate round numbers: 100 days together, 1,000 days, 10,000 hours, even a billion seconds. These rarely land on a date you would guess, so you have to count. In Korea the 100th day is a big one, and couples there often celebrate every hundred days after it.

Tool description

Enter the date you got together. The tool lists your milestones in the order they come up, from 100 days to 1,000,000,000 seconds, with the date and weekday of each one and how many days are left, or how long ago it passed. The next milestone sits on top, so you can see at a glance what to plan for.

Day, week, hour, minute and second milestones are all there: 100, 200, 300, 500, 1,000, 2,000, 3,000, 5,000 and 10,000 days, 100, 500 and 1,000 weeks, 10,000 and 100,000 hours, 1,000,000 minutes and 1,000,000,000 seconds.

Is the first day day 0 or day 1?

There are two ways to count, and they differ by one day:

  • Day 0: the day you got together doesn't count yet, so day 100 is 100 days later. This is how date calculators add days. Together since January 1 means day 100 is April 11.
  • Day 1: the day you got together is already day 1, so day 100 is 99 days later, April 10. This is how couples in Korea and Japan count their 100th day.

Tick "Count the first day as day 1" for the second way. It moves the day and week milestones. Hour, minute and second milestones count time from midnight at the start of your first day, so they stay where they are.

Examples

Together since February 14, 2024:

  • 100 days: Friday, May 24, 2024, or Thursday, May 23 when the first day counts as day 1
  • 10,000 hours: Saturday, April 5, 2025
  • 1,000 days: Tuesday, November 10, 2026
  • 1,000,000,000 seconds: Saturday, October 23, 2055

Features

  • Every milestone with its weekday and a countdown in days
  • The next milestone shown first
  • Korean style counting with the first day as day 1