Get the holidays for a date range. Get the holidays for a specific month. Get the holidays for an entire year. Get the date of a specific holiday. Get the available holidays. Get the holidays for a date range. Get the holidays for a specific month. Get the holidays for an entire year. Get the date of a specific holiday. Get the available holidays. Get the holidays for a date range. Get the holidays for a specific month. Get the holidays for an entire year. Get the date of a specific holiday. Get the available holidays. Web service that calculates national holidays for the US.