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D-Day Calculator and Date Countdown

D-Day Calculator and Date Countdown

Track time remaining until a date or time, or time elapsed since it, with live D-Day labels.

Focus mode
Add an item
Enter a label and target date. Saved items are stored in this browser.

Key features

  • Accepts either a date or an exact local date and time.
  • Displays D-N, D-DAY, or D+N relative to today.
  • Shows the live difference in days, hours, minutes, and seconds.
  • Stores multiple entries in the browser and sorts the nearest event first.

How to use

  1. Enter an event label and choose a date format.
  2. Select the target date or time and add the entry.
  3. Review the countdown and remove entries you no longer need.

Examples

  • Count down to an exam or deadline

    Save a date to see its D-day label and the number of calendar days remaining or elapsed.

  • Track an event time

    Save an exact local date and time to follow the remaining time down to seconds.

Privacy

Event labels and target dates are kept in this browser's local storage rather than sent to a server.

Requirements

Date-only entries are calculated from midnight in the device's current local time zone.

Common questions

How do date-only and date-time entries differ?
A date-only entry shows calendar-day distance from local midnight, while a date-time entry shows days, hours, minutes, and seconds to the target instant.
Where are my events stored?
The event list is kept in this browser's local storage. It is not synchronized automatically across browsers or devices.

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