D-Day · Date Calculator
Calculate D-day, the number of days between two dates, and the date N days before/after a given date.
Enter Dates
Thu, Sep 3, 2026
D-DAY 🎉
The D-day calculator counts down the days to a target date, finds the gap between two dates, or calculates the date N days before or after a given date. Use it for exam countdowns, anniversaries, project deadlines, and more.
How to use it
Count down to a college entrance exam, certification test, or civil service exam; work out anniversaries with a partner or spouse; track how many days remain until a contract or project deadline; or find milestone days like your 100th or 1000th day together. Everything is calculated automatically from today's date.
Frequently Asked Questions
Does D-day include the target day itself?
Typically the target day itself is D-0, and the day before is D-1. The gap between two dates is counted as the number of days between the start and end dates.
Does it handle leap years correctly?
Yes, it calculates precisely against the actual calendar, including leap years with February 29.
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