Hi there, @joefarrowsmith… what Adam said is likely the way to go, but if you want to get creative in a text element, here is an expression that would produce the 24th of the previous month.
To get the 24th of the next month, simply change the -1 to 1, and you’d be good to go.
Just food for thought… hope it helps.
Best…
Mike
P.S. if your next question is how did I get the parentheses in there, you have to enable the experimental parentheses feature.