This is used to visit a website at a set time. For example certain events might happen on a website at a particular time and you might not want to forget to check that website. This should beep when it loads the website. It will take you away from this website though, so you'll need to press the back button on your browser to come back.
Your Current Time
Make sure your time is synced with an NTP server if this is used for something important. The time shown is your computer's time. Check TIME.IS for the correct time.