There are scenarios where we might want a Flow to run, for example, everyday at 5pm, or very other day at midnight, etc.
While it would be possible to create a calendar with recurring events and trigger off these, this is inelegant, overly complex and subject to errors.
Ideally we want a trigger that takes time and date recuurence parameters, which then initiate a Flow.
Please note, the date formats MUST meet international standards (i.e. not the non-standard and nonsensical US date format. To help, here is a comprehensive list of all the countries in the world that use the MDY format: United States, Federated States of Micronesia, Marshall Islands).
Turns out this already exists, but you can only acces it when you create a new flow, i.e. you can't add it to an exising flow (which is a real limiations, as it means you can't swap the Trigger out on an existing flow)