As far as I know, you cannot access a list of previous discussions of the day. But, since these discussions are but regular posts, you can find them with the Hashnode Search (though you have to know what you are looking for).

If you feel like such a feature is missing and it would be great to have, please take a look at the Request A Feature page and add your idea! Thank you for your contribution :)

in Your profile/ Recent Activities if you have upvoted some posts you were interested in.