This page is returning the date from a SvelteKit page endpoint with ISR configuration specified. Incremental Static Regeneration allows you to create or update content without redeploying your site. When you deploy a route with ISR, Vercel caches the page to serve it to visitors statically, and rebuilds it on a time interval of your choice. ISR has three main benefits for developers: better performance, improved security, and faster build times. Learn more about ISR here.

This page endpoint runs on the server, and returns the current date and time. Since it is configure to be ISR and it's expiration is set to ten seconds, you'll notice the date does not change until at least ten seconds has passed since the last page visit.