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D-Day Calculator

Check the days remaining until an anniversary or exam date

Quick pick:

Saved D-Days 0

Add a D-Day to get started

See at a Glance How Many Days Are Left

Exam day, a big trip, anniversaries, project deadlines… save them all if you have several important dates. They're shown nearest first, with a live day/hour/min/sec countdown. Past dates show elapsed days with a D+ label.

📅 Great For

  • Tracking days left until exams or certification tests
  • Counting down to birthdays and anniversaries
  • D-Day for an upcoming trip departure
  • Counting down to graduation or a retirement date
  • Tracking a project deadline or moving day
  • Counting milestone days, like 100 days into a new habit or role

📋 How to Use

  1. Type a name in the title field (e.g. "Exam")
  2. Pick the target date with the date picker
  3. Press Add or hit Enter
  4. Use a quick-pick button to set 100 days later, Christmas, and more instantly
  5. Click a saved D-Day card to see its countdown

Frequently Asked Questions

How many D-Days can I save?

There's no set limit. Saved D-Days are kept in your browser's local storage. They may be cleared if your browser's storage fills up or you clear the cache.

Can I add a date that's already passed?

Yes. Entering a past date shows it as D+. For example, if a birthday was 50 days ago, it shows D+50, so you can see how much time has passed. Handy for tracking anniversaries or your start date at a job.

Can I edit a saved D-Day?

Yes. Hover over a saved D-Day card to reveal an edit button (✏️). Click it to edit the title and date.

How do I copy the result?

Press the "Copy result" button on the countdown screen to copy something like "D-30 (23h 15m 42s left — April 20, 2026)" to your clipboard. The Ctrl/⌘+C shortcut also works.

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