How to use
Pick a target date and the D-day count from today appears. Change the reference date to count from another day. The days left are also shown in weeks, which helps when you plan for an exam or a trip.
How D-day is written
If the target date is still ahead it shows D-(days left), on the day itself D-Day, and afterwards D+(days passed). Days left do not include the reference date. For example, if today is September 21 and the target date is October 14, there are 23 days left, so it shows D-23. If the target date has already passed, it shows D+ followed by the number of days passed. For example, if the target date is June 13 and today is September 21, it shows D+100.