Using the TR app on my iPhone it shows all the workouts in a list order. If the days have passed you can still go back and do the workouts in order. Once completed the workout has a green check so you know you’ve completed them. You’d never have to use the calendar except to load the next plan. If you plan out your year or a base - build - specialty you’d be all set for a long time.
The app works as the old system did if you just ignore the days/dates.