Use of
- A day like a wedding anniversary. The BeginningSelect from Calendar, the default value is Today.
- “Calculate the start of the day” If it is common for couples to count their date as 1 day, like 100 days, you can keep the checked status.
- to calculate Press the button to see how many days today is, the anniversary date from 100 to 3000, and the day D-day, and the three upcoming anniversaries.
- The result copy. Press a button to copy the entire calculation result and share it directly with the messenger.
The anniversary calculation.
In South Korea, marriage is usually celebrated on the same day. 1 daySo the Korean N Day Anniversary is not the beginning day, but the N Day. (N to 1)It is a more date.
For example, if you started dating on January 1, 2026, the 100th anniversary is 99 days later. 10 April 2026On the other hand, if you add 0 days to the start date and 100 days to the end, then it will be April 11th, which is the day after.
| anniversary | Korean (first day = 1 day) | Number of days (beginning day + n day) |
|---|---|---|
| 100 days | 2026.04.10 | 2026.04.11 |
| 200 days | 2026.07.19 | 2026.07.20 |
| thousand days | 2028.09.26 | 2028.09.27 |
The table above is an example if the start date is January 1, 2026. Calculation formula: Korean N-day anniversary = start date + (N−1) day, and how many days today is = past days + 1.
The anniversary and n00 anniversary.
1 year, 2 year anniversary is not a day. The Monthly Date. The same month as the beginning, the same day becomes the anniversary. However, the length of a year is 365 days or 366 days and does not correspond to the number of anniversaries. In the Korean term, the year is 366 days (367 days if February 29 in the year of Yuan) and therefore 365 days anniversary and two days. The 1,000 anniversary is a completely different day from the three years, because the 1,000 anniversary is about three months longer than the three years (approximately 1,096 days in the year of Yuan).
Knowing good information.
- When is 1000 days? It is approximately two years and nine months from the start date, which means 999 days. 2,000 days is approximately five years and six months, and 3,000 days is approximately eight years and three months.
- 200 days, 300 days and 500 days.Add 199 days, 299 days, 499 days each to the start date, so you can calculate the length of each month by hand and make it easy to use a calculator.
- June 29th begins.In this case, the anniversary of the ordinary year does not have the same date in the calendar, and this calculator indicates 1 March.
- Future dates are possible.If you insert a wedding scheduled date, you can accept the following anniversary date in advance with the remaining date until the wedding.
- Record the calculated anniversary in your smartphone calendar, and change the date every day. Calculation of D-DayUse them together.
This page is based on 2026, and the calculation results are for reference.All calculations are made only in the browser and the dates entered are not saved.
Frequently asked questions.
Count 100 days from the first day, counting from the next day.
In Korean terms, the first day is counted as 1 day. Therefore, the 100th anniversary is a date that adds 99 days to the start date. This calculator is basically calculated in Korean, and when you uncheck the checkbox, it is replaced by adding 100 days to the start date.
Why is a year and a 365 day anniversary different?
A year is the same month as the beginning day, and the Korean 365 day is the same day as the beginning day, which is 364 days added to the beginning day.
Other apps and calculations are different.
In most cases, the difference is whether you include the start date as 1 day. Compare the two ways by turning on and turning off the checkbox 'Calculate the start date as 1 day'.
Can I enter a future date as a start date?
Yes, if you enter a future date, such as the wedding date, you can pre-check the anniversary date after 100 days, anniversary, etc. along with the remaining date (D-n) until the start.
Is the date inserted?
All calculations are processed only within the browser and no information is transmitted or stored to the server.