The name is really bad but the script is still useful. If you have ideas for a better name, don't hesitate to suggest them.
I missed a few streams from a channel. And when I wanted to watch them, I realized that having "X days ago" instead of the date of the stream was really not practical. So I thought it would be easier to put the date directly. That's exactly what the script does.
It works with all modern browsers. Personally, I have made it work on Firefox Developer Edition, Microsoft Edge, Safari and Safari Preview Technology.
I use AdGuard as my userscript manager but I also tested it with Tampermonkey.
You can use the one you want, you can even copy and paste the code in the console.
The script does not use the API, it only retrieves the title of the thumbnails to display the date. So it shouldn't be a problem for you but if it's a problem don't hesitate to contact me. And if you ever put this function directly on the site, it would be with great pleasure.