Holiday Calendar API

Add business days while skipping weekends and full-day Public or Bank holidays; Optional and HalfDay observances are retained.

Holiday date check by country or subdivision — determine whether one ISO date is an official public holiday.

Official public holidays by country and year, with regional subdivisions, localized names and normalized dates.

Next official public holiday after a date for a supported country or regional subdivision.

Business-day count excluding weekends and full-day Public or Bank holidays; Optional and HalfDay observances remain business days.