Tool Web

D-Day Calculator

Select a target date to calculate the days remaining (D-N), days elapsed (D+N), and weekday based on today, in real time. All calculations happen inside your browser.

Select a date to see the D-Day.

How to use

  1. Select a target date.
  2. The days remaining or elapsed and the D-Day are shown based on today.
  3. You can also check the weekday of the target date and the period in weeks.

Frequently asked questions

How is D-Day counted?

The target day itself is D-DAY. If the target is still ahead it shows D-N for the number of days remaining, and if it has passed it shows D+N for the number of days elapsed.

Does it count the target day itself?

This calculator is based on the date difference between today and the target date. The target day is D-DAY, and the day before is D-1.

Are the dates I enter sent to a server?

No. All calculations happen only inside your browser, and the date you enter is never sent to or stored on any server.