Countdown calculator

Calculate your D-Day

See D−N before an event, D-Day on the date, and D+N after it.

Calendar date math

Set the dates

Target dateFrom dateEvent name · optional

Clear rules

Tomorrow is D−1, today is D-Day, and yesterday is D+1. The comparison uses calendar dates and does not add an extra day to the countdown.

Change the From date to calculate a historical or future countdown instead of using today.