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D-Day Calculator

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D-Day Calculator

Count the days until (or since) a target date.

Calculated from today. D-DAY means the target date itself.

How to use

  1. 1

    Pick a target date.

  2. 2

    The days remaining (or elapsed) appear in D-number format.

  3. 3

    Add a name to label what the countdown is for.

FAQ

Is this tool free?

Yes — it is completely free to use, with no account or sign-up required.

What is this tool?

Count how many days remain until a target date — an exam, anniversary, or deadline. Enter the date and it shows the days left as D-100, D-1, and so on, or D+number for a date that has already passed. You can add a name to label what the countdown is for. It's calculated from today, runs in your browser, and is free with no install.