Count the working days between two dates — for deadlines, notice periods, and "within 10 business days" promises. Weekends are always excluded; US federal holidays can be too.
The count includes the end date but not the start date, matching the usual "within N business days from today" reading. The holiday option covers the 11 US federal holidays, with observed dates when a holiday lands on a weekend. State holidays and company shutdowns are not included — subtract those manually if they apply.
Does it count today? The start date itself is not counted; the end date is, if it is a business day. That matches how most deadlines are written.
Which holidays are covered? The US federal list: New Year’s Day, MLK Day, Presidents Day, Memorial Day, Juneteenth, Independence Day, Labor Day, Columbus Day, Veterans Day, Thanksgiving, and Christmas, on their observed dates.