The README references this online demo:

Do you want to try it out without installing any dependency? Now you can test it quickly by visiting this online demo!

I tried the online demo, but it doesn't seem to work. When I look at the browser's developer console, I see this message:

Access to fetch at 'https://dateparser-demo-production.up.railway.app/?text=now&timezone=America/Chicago' from origin 'https://dateparser-demo.netlify.app' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled.