Quick answer
Your 100 day anniversary is 100 days after the day you got together, or 99 days after it if you count the first day as day 1. Enter your start date above to see the exact dates of your 100, 500 and 1,000 days together and every other milestone up to 10,000 days. For a couple who started on 1 January 2026, 100 days falls on Saturday 11 April 2026 and 1,000 days on Wednesday 27 September 2028.
How the 100 day anniversary calculator works
Enter the date your relationship started. The calculator lists every milestone from 50 to 10,000 days, with the date, the weekday and whether it has passed, is today or is coming up. Your next milestone sits at the top with a countdown, and passed milestones fold away so the list stays easy to read.
Want a number that is not on the list, such as 1,234 days or 4,321 days? Add it as a custom milestone and it is marked with a star. You can add every upcoming milestone to your calendar with one download, or share the list as a link or an image.
Should you count the first day?
Couples in South Korea, where 100-day celebrations are popular, often count the first day as day 1, and many couples elsewhere do the same. Calculators that count it as day 0 land one day later. Use the “Count our first day as day 1” switch so the dates match the way you count.
Relationship milestones in days: 100, 500, 1,000 and beyond
Here is roughly how long each milestone is. The calculator gives you the exact date for your own start date.
| Milestone | In weeks | Roughly |
|---|---|---|
| 100 days | 14 weeks and 2 days | just over 3 months |
| 365 days | 52 weeks and 1 day | 1 year (in a common year) |
| 500 days | 71 weeks and 3 days | 1 year and 4 months |
| 1,000 days | 142 weeks and 6 days | 2 years and 9 months |
| 1,111 days | 158 weeks and 5 days | just over 3 years |
| 2,000 days | 285 weeks and 5 days | 5 and a half years |
| 5,000 days | 714 weeks and 2 days | 13 years and 8 months |
| 10,000 days | 1,428 weeks and 4 days | 27 years and 4 months |
Repeating numbers such as 777, 1,111, 2,222 and 3,333 days are included too, because they make fun excuses for a small celebration.
Worked example: when is our 100 days together?
Suppose you got together on 1 January 2026. The calculator shows:
Example
Counting the start date as day 0
- 100 days: Saturday 11 April 2026.
- 200 days: Monday 20 July 2026.
- 500 days: Sunday 16 May 2027.
- 1,000 days: Wednesday 27 September 2028.
Example
Counting the start date as day 1
- Every date moves one day earlier.
- 100 days: Friday 10 April 2026.
- 1,000 days: Tuesday 26 September 2028.
Notice how the weekday changes: switching the count can move a milestone from a weekday onto a weekend, which may decide the way you celebrate.
How to celebrate 100 days together
One hundred days is early enough that a big gesture can feel like a lot. Small and personal usually lands best:
100 reasons, or ten
Write a list of things you like about them. One hundred is a challenge; ten good ones work just as well.
Recreate the first date
Go back to the place, or if you are apart, cook the same meal at the same time and compare notes.
A photo from each month
Pick one picture from each month so far and send them in order, with a line about each.
Draw it together
Draw your favourite moment from the first 100 days, side by side. Our drawing ideas for couples has prompts if you get stuck.
1000 days together: ideas for a bigger milestone
By 1,000 days you have nearly three years of shared history to draw on. Ideas that make the most of that:
A 1,000-day timeline
Make a simple timeline of the moments that mattered, with a photo for each. It is a lovely thing to look back at together.
A letter to day 2,000
Each write a short letter to open at your next big milestone. Add the date to your calendar from the list above.
Plan the next visit
If you live apart, use the day to book or plan your next trip, then start a countdown until we meet.
An evening of favourites
Their favourite food, film and song, on the same evening. See long-distance relationship activities for more shared evenings.
Make the milestones yours
Not every milestone needs a plan. Many couples pick two or three that matter to them, such as 100, 1,000 and 10,000 days, and simply send a message for the rest. If you are apart, a message that arrives as they wake up can mean more than a long call squeezed into a busy day.
For the yearly dates, the anniversary calculator shows which anniversary is next and its gift theme, and the days together calculator shows your total so far in days, weeks and months. Our long-distance anniversary ideas work for big day-count milestones too.
Q & A
Frequently asked questions
How do I calculate 100 days from a date?
Add 100 days to your start date, or 99 if you count the first day as day 1. The calculator does this for you and shows the weekday. For example, 100 days from 1 January 2026 is Saturday 11 April 2026.
How many years is 1000 days?
1,000 days is 142 weeks and 6 days, or about 2 years and 9 months. The exact number of months depends on your start date and whether a leap day falls in between.
When is our 500 days together?
500 days is about 1 year and 4 months after your start date. Enter your date in the milestone calculator to get the exact day, for example Sunday 16 May 2027 for a 1 January 2026 start.
Do you count the first day for a 100 day anniversary?
Both ways are common. Counting the first day as day 1 makes your 100th day one day earlier. Use the day 1 switch in the calculator to match the way you count.
How do you celebrate 100 days together?
Keep it small and personal: a list of things you love about them, a recreated first date, a photo from each month or a drawing of a favourite moment. If you live apart, cook the same meal at the same time.
Can I add our milestones to my calendar?
Yes. The calendar button downloads all your upcoming milestones as a standard calendar file that opens in Google Calendar, Apple Calendar or Outlook.
Do you save the dates or names I enter?
No. The calculation runs in your browser and nothing you type is sent to or stored on Lovelle's servers. Your inputs are kept in the page address after the # sign, which browsers do not send to websites, so a share link opens with the same result. Anyone with the link can see those inputs, so share it only with people you trust.
Keep reading
Results are for planning and fun. Dates are calculated from the calendar on your device; time zones use your browser's time-zone data. Last updated 24 October 2026.