Calendar days, weekdays only, whole weeks, and the calendar breakdown — all at once.
By default this counts the nights between — Friday to Monday is 3 days. Flip “count end date” to yes and both endpoints count — Friday to Monday becomes 4 days, the way event durations and prescriptions are usually described.
Every Monday–Friday after the start date up to and including the end date (or past it, if inclusive). Public holidays aren’t subtracted — they depend on where you live.
Entirely in your browser. Dates you type are never sent anywhere — there is no server doing the math, no analytics watching you do it.