Hi @johnsirrine,
How about if you create a screen action that checks the number of days between the current date and the start date. You can then use that number to access the appropriate content for the given day.
Alternatively you could - if you’re using a list to access the mini-lessons - filter it by the date. For example: you set a release date for every mini lesson. When the Current date is eaqual to or newer than the release date, you show the lesson in the list.