How the count works
The calculator counts calendar days from the start date to the end date, not including the end date — the way most contracts, notice periods and countdowns work. Tick “Include the end date” if you need both days counted (for example, the length of a trip or a hotel stay counted in days).
Weekdays
Weekdays are Monday to Friday. Public holidays are not removed because they differ by country and state, so subtract them yourself if they matter.
Add or subtract days
Enter a number like 90 to find the date 90 days after the start date (common for return windows, visa stays and payment terms), or -30 to go back 30 days.