Remote controlled relays with timing

I'm using arduino uno with ethernet shield for my project. My goal is to control relays and timings via webpage. For example, I go to webpage and set relay1 to switch on at 10AM. So far, I have managed to code a arduino sketch, which analyzes the website's url, ie. http://192.168.0.120/relay/5/1 and switches on relay number 5. Any suggestions how to solve the timing issue? Javascript coud be (?) one solution, but I know almost nothing about that language... =(

Any help would be highly appreciated.

Any suggestions how to solve the timing issue?

If your Arduino has any idea what time it is, the timing will be no problem.

If it doesn't, you need to find a way to make it aware of the time. RTC are the easiest way, but there are ways to get the time from the internet, for instance.