calendar/business

• businessDaysBetween: Count the working days between two local dates, excluding start and including end.
• mergeCalendars: Compose several jurisdictions’ calendars into one whose working days are those they all share.
• nextBusinessDay: Return the first working day strictly after value.
• previousBusinessDay: Return the last working day strictly before value.
• rollDate: Move a local date onto a working day according to convention.