CalcHub
D-Day Calculator (Date Difference)
Compute D-Day, date difference, and target dates from a D value with weekday-only option.
Base date
February 09, 2026
Target date → D-Day
Date difference
Target date
Select date
Include today
Exclude
Select base and target dates to compute D-Day.
All computations use the browser's local time zone.
Reset
Frequently Asked Questions
What do D+ and D- mean in D-Day calculation?
D-3 means 3 days after the base date, D+2 means 2 days before the base date.
What does 'Include Today' option mean?
How are weekdays counted?