This free D-day calculator counts the days between two dates, finds the date N days after a start date, and lists milestones like 100 and 1000 days. Great for exams, due dates, trips and couple anniversaries.
Reading a D-day
A future date shows as D-(days left), a past date as D+(days passed), and the day itself as D-Day.
Counting the start date as day 1
Couples usually count their first day together as day 1, so “100 days” falls 99 days after the start. Turn the option off to get exactly N days later.
FAQ
- How do I find our 100-day anniversary?
- Enter the day you started dating as the start date and keep “count the start date as day 1” on — it appears in the anniversary list.
- Are leap years handled?
- Yes, calculations follow the real calendar, including leap years.
- Can I count down to an exam or trip?
- Yes. Enter it as the target date to see the days left.
- Are my dates saved?
- No. Everything runs in your browser.
