Hey @Anonymous
Sure it's possible.
Here's the flow:


Regarding the formulas, let's get the 20th of last month. The first instinct is to get the number of the month and reduce it by one, but then you can run into issues (timezones, leap years, etc.). The best way to do this is to get the last month (using the formula for that), get the first day and add X days. Then you're always sure that you're calculating the correct date. With this in mind, here are the two formulas:
addDays(startOfMonth(subtractFromTime(utcNow(),1,'Month')),20)
and
addDays(startOfMonth(utcNow()),19)
Now it's just a question of comparing them and proceed with your flow.
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Cheers
Manuel