FREE — add n business days to a date (negative n walks backward)

Unmetered and unpriced; every country on every brand. The start date is day 0 and is never counted. n = 0 returns the date itself if it is a business day, otherwise the next business day. Returns result_date with every non-business day skipped and why. Refusals are free JSON: 400 for a malformed country, date or n; 404 for an unknown country; 422 year_not_held when a date falls in a year whose holidays we do not hold (the body lists years_held and, where the calendar is moon-sighted or instru...