how i set the date and time ?

Hi Alialemadi93,

Welcome to the Support Communities!

There may be an issue with your router settings as outlined in this article:

Apple TV: TCP and UDP ports and protocols used

http://support.apple.com/kb/ht2463

The articles below will walk you through the steps of troubleshooting your network connection:

Apple TV (2nd and 3rd generation): Troubleshooting Wi-Fi networks and connections

http://support.apple.com/kb/TS4546

If these steps do not resolve the issue, then restore the Apple TV:

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

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

Cheers,

Judy