The Adjust Date action asks for the date (which allows today, tomorrow, monday etc or a date to be entered) each time it is run. The Quick Look is the most basic output, which could be replaced by a Show Result.
The format of the date is selected by tapping the Adjusted Date in the Quick Look action.
There are a couple other approaches — one uses a date-picker, the other will take text, so you can just use “today” (the default below) or “tomorrow” or “Tuesday,” and so on.