‘How many days have we been together?’ is one of those questions that sounds simple until you try to answer it. Do you count from the first date or the day you became official? Does today count? What about leap years? This guide answers all of that, shows you the quickest way to get an exact number and suggests ways to celebrate the day counts that couples love, such as 100, 365, 500 and 1,000 days.
The quick way to find your number
Open a days-together calculator, enter the date your relationship started and it will show the number of days, plus weeks, months and years. Our free calculator also lists your next milestone dates so you can plan ahead.
If you want to work it out by hand, subtract your start date from today’s date. Most spreadsheet apps do this for you: type both dates in cells and subtract one from the other. The result is the number of days between them, not counting the start date.
Which start date should you use?
There is no official rule, and couples choose differently. The common options are the day you first met, your first date, your first kiss and the day you agreed to be a couple. For couples who met online, the first message or the first video call can feel like the true start.
Pick the date that feels most meaningful to both of you and make it your anniversary as well, so your day counts and yearly celebrations line up. If you cannot agree, some couples happily celebrate two: one for the first date and one for becoming official.
Does today count? Day 0 versus day 1
Calculators and couples count in two ways. In the ‘elapsed days’ method, your start date is day 0 and the next day is day 1. In the ‘inclusive’ method, popular in South Korea where couples celebrate the 100th day, your start date is day 1. The two methods differ by one day.
Neither is wrong. What matters is consistency. If you celebrated day 100 using the inclusive method, use it for day 1,000 too. A good calculator tells you which method it uses.
| Milestone | Elapsed (start = day 0) | Inclusive (start = day 1) |
|---|---|---|
| 100 days | 25 May 2026 | 24 May 2026 |
| 200 days | 2 September 2026 | 1 September 2026 |
| 365 days | 14 February 2027 | 13 February 2027 |
| 500 days | 29 June 2027 | 28 June 2027 |
Leap years, months and other odd details
A year is 365 days, except leap years, which have 366 because of 29 February. The next leap day is 29 February 2028. If your relationship spans a leap year, a manual count that assumes 365 days per year will be a day short; calculators handle this automatically.
Months are uneven too, which is why ‘months together’ is a little fuzzy. Most people count a month from the same date in the next month, so if you started on the 31st, months without a 31st usually use the last day of the month instead.
Day-count milestones worth celebrating
Day counts are fun because they land on surprising dates. A few are especially popular.
Day 100
About 3 months
The first big count. In South Korea it is a well-known couple celebration, often marked with a small gift or a special date.
Day 365
1 year
Your first anniversary, counted in days. Saying ‘365 days of you’ feels different from ‘one year’.
Day 500
About 1 year and 4 months
A nice halfway point to the thousand, and an excuse for a date night in the middle of the year.
Day 1,000
About 2 years and 9 months
The big one for day counters. Our 1,000 days guide has 20 ways to mark it.
Day 1,111 or 2,222
Repeating numbers
Fun, nerdy and very screenshot-able.
Simple ways to celebrate a day count
Day counts are best kept small and playful. Send a screenshot of the number with a message, share the same dessert on a call, or make a playlist with one song for each hundred days. Long-distance couples can use a day count as a reason to plan the next visit, or count down to it with a second timer.
Another idea is to keep a tiny note for each milestone in a shared album: where you were, what you did, one thing you love about each other right now. Over time it becomes a timeline of your relationship.
Q & A
A few questions you might have
How do I calculate how many days we have been together?
Enter your start date in a days-together calculator, or subtract the start date from today in a spreadsheet. Both give the number of days that have passed.
Do you count the first day as day 1?
It depends on the method. Some couples count the start date as day 1 (common for 100-day celebrations in South Korea); calculators often treat it as day 0. Pick one and use it consistently.
When is our 100th day together?
Add 99 days to your start date if it counts as day 1, or 100 days if it counts as day 0. A calculator shows the exact date for you.
Do leap years affect the count?
Yes. A leap year adds one day (29 February). Calculators include it automatically; manual counts using 365 days per year will be slightly off.
Found an idea for the two of you?
Send it to your person and choose something to try together.
