Japanese business days: the date N business days from a date (with resultIsHoliday), business days between two dates, whether a date is a business day with the previous and next, or a year's holidays. National holidays by the Act on National Holidays with substitute and citizens' holidays and equinox days; options for the December 29 to January 3 break, bank holidays and Saturday as a business day. For settlement dates and deadlines in Japan. Each answer names its rule source.

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