How to use
- In Countdown, pick a target date to see how many days are left. Add a name and copy the link to share the countdown.
- In Anniversary, enter a start date to see which day today is and when your 100th, 1000th day and yearly anniversaries fall.
- In Between dates, enter two dates to get the difference in days, weeks and months.
- In Add days, enter a date and a number of days to find the date before or after.
Good to know
The "D-Day" format counts down to a target: D-10 means ten days to go, D-Day is the day itself and D+3 means three days after. It is widely used in Korea and Japan for exams, launches and anniversaries.
In Korea, couples celebrate their 100th day together, counting the first day as day 1. If you started dating on January 1, day 100 is April 10 (in a non-leap year). The Anniversary tab uses this method by default; untick the option to start counting from the next day.
Days between dates excludes the start date and includes the end date by default, which is the usual way to measure a duration. Turn on "Include the end date" when you need to count both ends, such as days of a trip.
FAQ
How many days until a date?
Pick the date in the Countdown tab. The result updates instantly and accounts for leap years.
What does D-Day mean?
D-Day is the target day itself. D-1 is the day before, and D+1 is the day after.
How is the 100-day anniversary calculated?
Following the Korean custom, the first day counts as day 1, so day 100 is the start date plus 99 days.
Can I count business days?
Not yet โ this tool counts calendar days. A business-day calculator is on our list.
Updated: