Clock Set Incorrectly?

So I'm sitting in a surgery waiting room, waiting and I thought I'd pull out my laptop and walk around SL while I wait. I'm on a high speed wireless connection. I've never ever had problem loggin in on my laptop wirelessly at home or anywhere.

However, over this guest connection, I'm not able to log in due to my computer clock could be set incorrectly? I've never seen this message. It must be the computer clock that serves the wireless connection because my laptop is set to the correct time. Is there some easy work around to this? I'm going to be sitting here a couple of hours waiting and I need to feed my urge to shop!

Connections over SSL (https:// addresses for example) fail because your computer must have the correct date and time to properly use the SSL certificate.
SL's login system uses SSL.

Since your conecting through a public wifi system maybe it is a problem with one of the hospitals computers. You can't fix that, unfortunately.

WahhhhhH! Dammit. Thank you. That's along the lines of what I was thinking, but more technically put.