Calculator
How Long Have We Been Together? Your Relationship Calculator
· 5 min read
Ever wondered exactly how long you’ve been together? Enter the date your relationship began, and this relationship calculator breaks it down into years, months, and days—right down to the second. You’ll also see your next anniversary and upcoming milestones worth celebrating.
Relationship calculator
When did you get together?
Your time together
- Months
- 0
- Weeks
- 0
- Days
- 0
- Hours
- 0
- Minutes
- 0
- Seconds
- 0
Your next anniversary
Your next milestones
Shared moments
Your date stays in your browser. The calculator doesn’t save it or send it to our server. If you choose to share your result, you control where it goes.
How the relationship calculator works
Enter the date you got together. If you remember the time, enter that too, and the calculator can determine the hours, minutes, and seconds more precisely. Without a time, it counts from midnight.
- Calendar days: The calculator counts calendar dates, not completed 24-hour periods. On the date your relationship began, it shows 0 days; on the next calendar date, 1 day. Hours, minutes, and seconds are based on the time that has actually passed, so daylight saving time can make a difference.
- Live: Hours, minutes, and seconds keep counting as long as the page is open.
- Anniversary: Your next anniversary appears with its date, weekday, and the number of days until then.
- Milestones: from 100 days to 1 billion seconds, each with a date.
Milestones: from 100 days to 1 billion seconds
Besides your anniversaries, there are special numbers worth celebrating. The table below shows how long each milestone takes to reach. Years and months are rounded, since months and years vary in length.
| Milestone | How long it takes | Ways to celebrate |
|---|---|---|
| 100 days | 14 weeks and 2 days, just over 3 months | An evening at the place where it all started |
| 10,000 hours | 416 days and 16 hours, about 1 year and 2 months | A list of your favorite moments so far |
| 500 days | 71 weeks and 3 days, about 1 year and 4 months | Take a day trip somewhere neither of you has been before |
| 1 million minutes | 694 days, 10 hours, and 40 minutes, about 1 year and 11 months | Make a playlist of songs that remind you of your time together |
| 1,000 days | 142 weeks and 6 days, about 2 years and 9 months | Make a collage of your favorite photos from the past 1,000 days |
| 1,111 days | 158 weeks and 5 days, just over 3 years | For fans of repeating numbers: make a wish together at 11:11 |
| 100 million seconds | 1,157 days, 9 hours, 46 minutes, and 40 seconds, about 3 years and 2 months | A walk to the places that mean something to you, with a photo at each one |
| 1,000 weeks | 7,000 days, about 19 years and 2 months | A dinner with the people who have been there from the start |
| 10,000 days | 1,428 weeks and 4 days, about 27 years and 5 months | A party with family and friends |
| 1 billion seconds | 11,574 days, 1 hour, 46 minutes, and 40 seconds, about 31 years and 8 months | A look back with photos from more than three decades |
The calculator shows you exactly when you’ll reach each milestone, with the date and weekday.
Why a year isn’t always 365 days
Once you start counting days, you notice the calendar has a few quirks. The calculator takes all of them into account.
Leap years: A year has 365 days, a leap year 366. Every year divisible by 4 is a leap year. Century years, however, are leap years only if they are also divisible by 400. That’s why 2000 was a leap year and 2100 won’t be. On average, a year in the Gregorian calendar is 365.2425 days long.
Months: Months have 28 to 31 days, so the calculator counts actual calendar months. If your start date falls on the 31st, the calculator uses the last day of shorter months.
Daylight saving time: In most of the U.S., clocks spring forward on the second Sunday in March and fall back on the first Sunday in November. That makes one day in March 23 hours long and one day in November 25 hours long. Hawaii and most of Arizona stay on standard time all year. The calculator counts the hours that have actually passed, which is why your hours divided by 24 don’t always match your number of days exactly.
Which date counts?
Not every couple has one clear start date. Possible days include:
- the day you met
- your first date
- your first kiss
- the day you became a couple
- your wedding day
You can use the calculator for each of these dates. Wedding anniversaries also come with traditional themes, from paper to diamond. Read more in our article Wedding Anniversaries by Year.
Frequently asked questions
How do I calculate how long we’ve been together?
The easiest way is the calculator above. If you’d rather do the math yourself, use Excel: with your date in cell A1, the formula =TODAY()-A1 returns the number of calendar days until today. To see a number instead of a date, set the result cell to the “General” number format.
Does the first day count?
The calculator counts calendar dates: on your first day, it shows 0 days. If you count your first day as “day 1,” you’ll always be one day ahead of the calculator. Your “1,000th day” then falls one day before the “1,000 days together” milestone.
When will we be together for 1,000 days?
1,000 days is about 2 years and 9 months. For example, a couple who got together on January 1, 2020, reached 1,000 days on September 27, 2022. The calculator shows your exact date.
How many days are in one year of a relationship?
365 days, or 366 if a February 29 falls in between.
How many hours, minutes, and seconds are in a year?
A 365-day year has 8,760 hours, 525,600 minutes, and 31,536,000 seconds. A leap year has 8,784 hours, 527,040 minutes, and 31,622,400 seconds. You may know the 525,600 minutes from “Seasons of Love” in the Broadway musical Rent.
We got together on February 29. When do we celebrate?
February 29 only exists in leap years. In all other years, the calculator places your anniversary on February 28. Of course, you can also celebrate on March 1, or on both days.
Is our data saved?
No. Your date stays in your browser. The calculator doesn’t save it or send it to our server. If you choose to share your result, it’s sent to the app or sharing option you select.
Your time together, always with you
Want to keep celebrating the days that matter? Anniversaries & Photo Collages helps you track anniversaries and relationship milestones like 100, 500, or 1,000 days on your iPhone. See your next anniversary at a glance, set reminders, and look back on your favorite moments with photos and a timeline. Your entries and memories are stored locally on your iPhone.
Your special days deserve a place of their own
With Anniversaries & Photo Collages, you count down to your anniversaries and save photos, notes, and voice messages for each one. Free, ad-free, and no account needed.
Keep reading
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