Delay Close of Record with JS?

I have some custom javascript that executes on change of the "Created On" field on a record. Everything works correctly if a user fills out all necessary fields and then clicks "Save". When a user clicks "Save and Close", however, the javascript fails to execute. I know that I can prevent the default behavior of that save and close button, but that isn't great for user experience. Is there a way to delay the close event so that the javascript can properly execute? Or does anyone know an alternate solution to an issue like this? Thanks in advance for any help.