I would like to be able to read a field value before saving the form to apply it in another field in an acf_form
I have a “starting_date” date field and an “ending_date” date field for events.
In case “ending_date” is emplty, I would like to copy “starting_date” value in “ending_date” field.
I’m pretty sure I’ll get a solution with an “update_value” filter function. I can set a value to a field, but I didn’t found any solution in documentation to get a field value before saving in a acf_form.