Calendar day calculator with day/date filtering capability

Returns calendar days between two dates and can filter results based on day/date inclusion/exclusion

Utility that returns the dates/days between a start date and end date. It can filter results such that only dates that fall on certain days (like Mondays, Wednesdays, and Fridays) are returned. It can also exclude dates that fall on weekends (or any other days the user specifies), as well as exclude specific dates, such as holidays.