How day counts work
The difference is end midnight minus start midnight, in whole days. Weekdays skip Saturday and Sunday. The count does not include the start date and does include the end date when the times are midnight-to-midnight — the same way many “days until” widgets work. If you need inclusive hotel nights, add 1 or use nights = days.
Common questions
Does this include the first day?
The raw difference between two calendar dates does not count the start day. A Monday to the next Monday is 7 days.
What about holidays?
Holidays still count as weekdays if they fall Monday–Friday.