Q: apple tv cant sign in to iTunes store until the network time has been set. I have no idea what this means

Hello, Evie623

I had this same issue and what worked for me was power cycling my wireless network and the Apple TV.  However, if the issue persists, here are a couple articles that will walk you through troubleshooting this issue.

Apple TV: Basic troubleshooting

http://support.apple.com/kb/ht1551

Apple TV: Troubleshooting wireless connections

http://support.apple.com/kb/HT1595

If the steps in the article above do not resolve the issue, then a restore may be needed.

Apple TV (2nd and 3rd generation): Restoring your Apple TV

http://support.apple.com/kb/ht4367

Cheers,

Jason H.