Holiday Calendar

• list_federal_holidays — List the eleven U.S. federal holidays for one calendar year (2021 through 2100): each holiday's name, its actual date and weekday, the date it is observed when
• next_federal_holidays — Find the next one to eleven U.S. federal holidays observed on or after a date, with each one's observed date and how many calendar days away it is. Without from
• check_business_day — Check whether a date is a U.S. business day (a weekday that is not an observed federal holiday). Returns the weekday, the holiday observed that day if any, and
• add_business_days — Move a number of U.S. business days forward or backward from a date, skipping weekends and observed federal holidays, for due dates, delivery windows and notice
• count_business_days — Count the U.S. business days between two dates, both dates included, leaving out weekends and observed federal holidays. Returns the business day count, the wee

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