Is there a way to automatically change the start dates using a business rule? Can those start dates be referenced in business rules (i.e., in a parser rule)?
Once start dates have been applied properly, it is possible to get this information within a business rule. The two snippets below provide examples of retrieving the start date of a specified month and the number of days in the month (based on the start dates).
Source: Office Hours 2021-01-21 - Partner Enablement