Problem Description: Salesforce customers/users find it hard to count business days between today and a particular date as there is no function/method which lets you know the number of business days between two dates. So, if a user wants to get notified when there are exactly 'x' business days left before a particular date, there is no straightforward way of achieving it.
Challenges to User/Developer: A Suggested workaround is to create a formula field that holds a date which is exactly 'x' business days away from a particular date.