D-minus
If the target is in the future, target date - today is shown as D-n.
D-Day Counter
Add Event
A D-Day counter tracks important dates as time remaining or time passed
This counter lets you save exams, birthdays, trips, anniversaries, and other dates, then sorts them as D-minus, D-Day, or D-plus from today. Events within the next 7 days also show a live seconds countdown for closer planning.
Calculation rules
D-Day
If the target date is today, it is shown as D-Day.
D-plus
If the target has passed, today - target date is shown as D+n.
How to use
- Enter an event name and target date.
- Save up to 10 events and review the closest future dates first.
- Delete completed or unnecessary events.
Frequently asked questions
Where are events stored?
They are stored in your browser's localStorage, so they remain on the same browser.
Do events sync across devices?
No. This tool does not use account sync; storage is local to each browser and device.
Why do only events within 7 days show seconds?
The live countdown is limited to near-term events to keep the page focused and lightweight.
This tool is for personal date tracking. Confirm official deadlines with the relevant institution or organizer.