Timestamps, Name Detection, And File Detection

I'm creating a music program with ComputerCraft that can, of course, save songs. I want to be able to do three things:
-Save the date last saved, preferably from some sort of system clock?
-Scan through all files on a computer for a code the program will save to each song, allowing a loading system.
-Detect who owns the computer, or preferably who is using the computer, to save to the file as the author.
Does anyone know how to do any of these?

OS.clock appears to get the computercraft computer's 'system time'. I want to get either the server's or client's time, or possibly grab it from a website. The fs API should work though, thanks.

So you mean you want to get the irl time?
I think you'll probably have to use http for that..
I think I have a script that does that, If I can find it…
But go and check out http on the wiki ;)/>
http://computercraft.info/wiki/HTTP_(API)
And you'll probably have to get the time from a site.