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Free D-day Calculator
Free D-day calculator. Count the days left until an exam, trip, birthday or anniversary, or the days since a past date, right in your browser.
Run it in your browser
Free · no sign-up · files stay on your device
Everything runs in your current browser. Selected files and text are not sent to our servers. Some tools download a small engine the first time you run them.
Launch the toolHow to use it
- Enter the name of the event.
- Pick the date.
- Read the D-day count and the days left or passed, then copy, save or export it.
Frequently asked questions
How is today determined?
The count uses today's date in Korea Standard Time (KST) and compares whole days, so it can differ by one day from your local date near midnight.
What do D-7 and D+3 mean?
D-7 means the date is 7 days away. D+3 means it was 3 days ago, and D-Day means it is today.
Can it count hours and minutes?
No. The current version counts whole days only and does not offer a time-level countdown.
How many events can I save?
Up to 20 in this browser. When you reach the limit, delete an old event before saving a new one.
Can I add the date to my calendar?
Yes. Use the download button to get an .ics file for the event date and import it into your calendar app.