I haven't gotten a clear response on here or from my direct emails with the support team about this except "If a course does not contain any dates except for the term dates, Catalog sets the course to be permanently self-paced with no start or end dates." I assume that means that if you set the dates manually in Canvas, they port over to Catalog — but that has not always been the case for courses that I've listed.
I now see a "start" and "end" date and time option in the Catalog Listing backend. I though this might be to control what shows on the Catalog listing in addition to the settings in Canvas for the course start and end date, but I think it's to control when enrollment opens and closes. https://community.canvaslms.com/t5/Canvas-Catalog-Releases/Catalog-Release-Notes-2022-12-13/ta-p/547...
This is a great new feature, but is not related to the start/end date of courses (my understanding), so could be confusing. My recommendation to the Catalog team would be to update the new feature to say "Enrollment Open Date" and "Enrollment Close Date" to avoid any confusion.
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